Gamma-ray Burst 090618

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:28:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          294.021d {+19h 36m 05s} (J2000),
                 293.909d {+19h 35m 38s} (current),
                 294.605d {+19h 38m 25s} (1950)
GRB_DEC:         +78.353d {+78d 21' 13"} (J2000),
                 +78.375d {+78d 22' 30"} (current),
                 +78.239d {+78d 14' 20"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8766 [cnts]    Image_Peak=1097 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       26719 [cnts]
BKG_TIME:        30491.16 SOD {08:28:11.16} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30509.85 SOD {08:28:29.85} UT
GRB_PHI:          23.57 [deg]
GRB_THETA:        31.12 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     85.83 [sigma]
IMAGE_SIGNIF:    22.57 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +8  +0  +0 -22  +0 
SUN_POSTN:        86.99d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 35s}  +15.07d {+15d 03' 55"}
MOON_DIST:        75.00 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       69.55, 76.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 166.93,3.09 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=267006508).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:28:42 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     267006508
GRB_RA:          304.583d {+20h 18m 20s} (J2000),
                 304.647d {+20h 18m 35s} (current),
                 304.245d {+20h 16m 59s} (1950)
GRB_DEC:         +52.850d {+52d 51' 00"} (J2000),
                 +52.880d {+52d 52' 48"} (current),
                 +52.693d {+52d 41' 34"} (1950)
GRB_ERROR:       6.95 [deg radius, statistical plus systematic]
GRB_INTEN:       618 [cnts/sec]
DATA_SIGNIF:     6.90 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         276.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:        86.99d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         96.99 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 35s}  +15.07d {+15d 03' 54"}
MOON_DIST:        70.83 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       88.27,  9.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      337.91, 68.29 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 128.95,-1.85 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:28:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     267006508
GRB_RA:          291.700d {+19h 26m 48s} (J2000),
                 291.639d {+19h 26m 33s} (current),
                 292.018d {+19h 28m 04s} (1950)
GRB_DEC:         +74.967d {+74d 57' 60"} (J2000),
                 +74.986d {+74d 59' 10"} (current),
                 +74.863d {+74d 51' 47"} (1950)
GRB_ERROR:       5.58 [deg radius, statistical plus systematic]
GRB_INTEN:       546 [cnts/sec]
DATA_SIGNIF:     19.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.35
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:        86.99d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         80.35 [deg]   Sun_angle= 10.4 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 35s}  +15.07d {+15d 03' 56"}
MOON_DIST:        75.72 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      106.65, 23.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       59.54, 79.10 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 128.95,-1.85 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:29:32 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     267006508
GRB_RA:          303.750d {+20h 15m 00s} (J2000),
                 303.614d {+20h 14m 27s} (current),
                 304.447d {+20h 17m 47s} (1950)
GRB_DEC:         +80.300d {+80d 17' 60"} (J2000),
                 +80.329d {+80d 19' 45"} (current),
                 +80.144d {+80d 08' 38"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     47.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         302.00 [deg]
GRB_THETA:       132.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         74.46 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 37s}  +15.07d {+15d 04' 05"}
MOON_DIST:        73.31 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      113.06, 23.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       70.45, 73.76 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:29:28 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     267006508
GRB_RA:          288.960d {+19h 15m 50s} (J2000),
                 288.763d {+19h 15m 03s} (current),
                 289.983d {+19h 19m 56s} (1950)
GRB_DEC:         +81.080d {+81d 04' 48"} (J2000),
                 +81.097d {+81d 05' 49"} (current),
                 +80.987d {+80d 59' 14"} (1950)
GRB_ERROR:       1.68 [deg radius, statistical only]
DATA_SIGNIF:     38.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:       130.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         74.89 [deg]   Sun_angle= 10.5 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 37s}  +15.07d {+15d 04' 04"}
MOON_DIST:        75.72 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      113.07, 25.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       78.97, 74.73 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:29:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      85
TRIGGER_NUM:     267006508
GRB_RA:          294.767d {+19h 39m 04s} (J2000),
                 294.683d {+19h 38m 44s} (current),
                 295.198d {+19h 40m 48s} (1950)
GRB_DEC:         +76.817d {+76d 48' 60"} (J2000),
                 +76.839d {+76d 50' 19"} (current),
                 +76.699d {+76d 41' 56"} (1950)
GRB_ERROR:       5.02 [deg radius, statistical plus systematic]
GRB_INTEN:       541 [cnts/sec]
DATA_SIGNIF:     20.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.91
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         78.36 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.65d {+01h 30m 37s}  +15.07d {+15d 04' 06"}
MOON_DIST:        74.87 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      108.82, 23.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       64.16, 77.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 128.95,-1.85 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:29:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      124
TRIGGER_NUM:     267006508
GRB_RA:          295.600d {+19h 42m 24s} (J2000),
                 295.515d {+19h 42m 04s} (current),
                 296.041d {+19h 44m 10s} (1950)
GRB_DEC:         +77.017d {+77d 00' 60"} (J2000),
                 +77.039d {+77d 02' 22"} (current),
                 +76.895d {+76d 53' 43"} (1950)
GRB_ERROR:       3.57 [deg radius, statistical plus systematic]
GRB_INTEN:       3167 [cnts/sec]
DATA_SIGNIF:     86.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         78.09 [deg]   Sun_angle= 10.1 [hr] (West of Sun)
MOON_POSTN:       22.66d {+01h 30m 37s}  +15.07d {+15d 04' 08"}
MOON_DIST:        74.68 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      109.10, 23.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       64.30, 77.06 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 128.95,-1.85 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:29:55 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      127
TRIGGER_NUM:     267006508
GRB_RA:          296.200d {+19h 44m 48s} (J2000),
                 296.115d {+19h 44m 28s} (current),
                 296.641d {+19h 46m 34s} (1950)
GRB_DEC:         +77.083d {+77d 04' 60"} (J2000),
                 +77.107d {+77d 06' 23"} (current),
                 +76.959d {+76d 57' 34"} (1950)
GRB_ERROR:       3.53 [deg radius, statistical plus systematic]
GRB_INTEN:       3511 [cnts/sec]
DATA_SIGNIF:     137.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:       135.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.62
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.97 [deg]   Sun_angle= 10.1 [hr] (West of Sun)
MOON_POSTN:       22.66d {+01h 30m 38s}  +15.07d {+15d 04' 09"}
MOON_DIST:        74.55 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      109.21, 23.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       64.15, 76.92 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 128.95,-1.85 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:30:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      88
TRIGGER_NUM:     267006508
GRB_RA:          306.670d {+20h 26m 41s} (J2000),
                 306.493d {+20h 25m 58s} (current),
                 307.573d {+20h 30m 17s} (1950)
GRB_DEC:         +81.900d {+81d 54' 00"} (J2000),
                 +81.931d {+81d 55' 53"} (current),
                 +81.732d {+81d 43' 55"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     111.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         301.00 [deg]
GRB_THETA:       132.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         72.90 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:       22.66d {+01h 30m 39s}  +15.07d {+15d 04' 19"}
MOON_DIST:        73.15 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      114.84, 23.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       73.83, 72.42 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:30:44 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      126
TRIGGER_NUM:     267006508
GRB_RA:          281.440d {+18h 45m 46s} (J2000),
                 280.999d {+18h 44m 00s} (current),
                 283.734d {+18h 54m 56s} (1950)
GRB_DEC:         +84.740d {+84d 44' 24"} (J2000),
                 +84.750d {+84d 45' 01"} (current),
                 +84.679d {+84d 40' 45"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     282.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:       128.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         71.69 [deg]   Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN:       22.66d {+01h 30m 39s}  +15.07d {+15d 04' 20"}
MOON_DIST:        76.05 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      117.02, 27.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       86.68, 71.69 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 18 Jun 09 08:29:46 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    5887,   Sub_Num: 0
GRB_INTEN:      9.11 [sigma]   
GRB_TIME:       30502.86 SOD {08:28:22.86} UT
GRB_DATE:       15000 TJD;   169 DOY;   09/06/18
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
+ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2009-06/2009-06-18T08-28-22.7716-00651-00007-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:30:58 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          293.9897d {+19h 35m 57.52s} (J2000),
                 293.8770d {+19h 35m 30.48s} (current),
                 294.5746d {+19h 38m 17.90s} (1950)
GRB_DEC:         +78.3576d {+78d 21' 27.3"} (J2000),
                 +78.3790d {+78d 22' 44.2"} (current),
                 +78.2431d {+78d 14' 35.1"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.15e-07 [erg/cm2/sec]
GRB_SIGNIF:      14.73 [sigma]
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30630.75 SOD {08:30:30.75} UT,   120.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.23 261.62 243.45
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.67d {+01h 30m 40s}  +15.07d {+15d 04' 23"}
MOON_DIST:        75.00 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       69.58, 76.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.45 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:31:14 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          293.9897d {+19h 35m 57.5s} (J2000),
                 293.8770d {+19h 35m 30.4s} (current),
                 294.5746d {+19h 38m 17.9s} (1950)
GRB_DEC:         +78.3576d {+78d 21' 27.3"} (J2000),
                 +78.3790d {+78d 22' 44.2"} (current),
                 +78.2431d {+78d 14' 35.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       217 [cnts]
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30630.75 SOD {08:30:30.75} UT,   120.9 [sec] since BAT Trigger Time
CENTROID_X:      334.04,  raw= 334  [pixels]
CENTROID_Y:      315.57,  raw= 316  [pixels]
ROLL:            25.41 [deg]
GAIN:            4
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   41.43
GRB_POS_XRT_Z:   74.82
IMAGE_URL:       sw00355083000msxps_rw.img
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.67d {+01h 30m 41s}  +15.07d {+15d 04' 26"}
MOON_DIST:        75.00 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       69.58, 76.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:31:08 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          293.9897d {+19h 35m 57.5s} (J2000),
                 293.8770d {+19h 35m 30.4s} (current),
                 294.5746d {+19h 38m 17.9s} (1950)
GRB_DEC:         +78.3576d {+78d 21' 27.3"} (J2000),
                 +78.3790d {+78d 22' 44.2"} (current),
                 +78.2431d {+78d 14' 35.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       217 [cnts]
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30630.75 SOD {08:30:30.75} UT,   120.9 [sec] since BAT Trigger Time
CENTROID_X:      334.04,  raw= 334  [pixels]
CENTROID_Y:      315.57,  raw= 316  [pixels]
ROLL:            25.41 [deg]
GAIN:            4
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   41.43
GRB_POS_XRT_Z:   74.82
IMAGE_URL:       sw00355083000msxps_rw.img
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.67d {+01h 30m 40s}  +15.07d {+15d 04' 25"}
MOON_DIST:        75.00 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.33 [deg] galactic lon,lat of the burst
ECL_COORDS:       69.58, 76.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:32:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          294.021d {+19h 36m 05s} (J2000),
                 293.909d {+19h 35m 38s} (current),
                 294.605d {+19h 38m 25s} (1950)
GRB_DEC:         +78.353d {+78d 21' 13"} (J2000),
                 +78.375d {+78d 22' 30"} (current),
                 +78.239d {+78d 14' 20"} (1950)
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30509.85 SOD {08:28:29.85} UT
TRIGGER_INDEX:   146
GRB_PHI:          23.57 [deg]
GRB_THETA:        31.12 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     85.83 [sigma]
IMAGE_SIGNIF:    22.57 [sigma]
LC_URL:          sw00355083000msb.lc
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.68d {+01h 30m 42s}  +15.08d {+15d 04' 36"}
MOON_DIST:        74.99 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       69.55, 76.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 166.93,3.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:33:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.090d {+19h 36m 22s} (J2000)
POINT_DEC:       +78.370d {+78d 22' 11"} (J2000)
POINT_ROLL:      25.418d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30638.18 SOD {08:30:38.18} UT,   128.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.736
N_STARS:         65
X_OFFSET:        320 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0128.fits
SUN_POSTN:        87.00d {+05h 48m 00s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.69d {+01h 30m 45s}  +15.08d {+15d 04' 55"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:34:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.090d {+19h 36m 22s} (J2000)
POINT_DEC:       +78.370d {+78d 22' 11"} (J2000)
POINT_ROLL:      25.418d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30638.18 SOD {08:30:38.18} UT,   128.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.736
N_STARS:         65
X_OFFSET:        320 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0128.fits
SUN_POSTN:        87.00d {+05h 48m 00s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.70d {+01h 30m 47s}  +15.08d {+15d 05' 03"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:33:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.090d {+19h 36m 22s} (J2000)
POINT_DEC:       +78.370d {+78d 22' 11"} (J2000)
POINT_ROLL:      25.418d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30638.18 SOD {08:30:38.18} UT,   128.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.736
N_STARS:         65
X_OFFSET:        320 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0128.fits
SUN_POSTN:        87.00d {+05h 48m 00s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.69d {+01h 30m 45s}  +15.08d {+15d 04' 55"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:34:51 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.090d {+19h 36m 22s} (J2000)
POINT_DEC:       +78.370d {+78d 22' 11"} (J2000)
ROLL:            25.418d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30638.18 SOD {08:30:38.18} UT,   128.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     267006643
X_OFFSET:        624 [pixels]
Y_OFFSET:        875 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       784
Y_GRB_POS:       1035
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0133.fits
SUN_POSTN:        87.00d {+05h 48m 00s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.70d {+01h 30m 48s}  +15.09d {+15d 05' 12"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:35:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.090d {+19h 36m 22s} (J2000)
POINT_DEC:       +78.370d {+78d 22' 11"} (J2000)
ROLL:            25.418d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30638.18 SOD {08:30:38.18} UT,   128.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     267006643
X_OFFSET:        624 [pixels]
Y_OFFSET:        875 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       784
Y_GRB_POS:       1035
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0133.fits
SUN_POSTN:        87.00d {+05h 48m 00s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.71d {+01h 30m 49s}  +15.09d {+15d 05' 18"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:30:30 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      87
TRIGGER_NUM:     267006508
GRB_RA:          294.780d {+19h 39m 07s} (J2000),
                 294.697d {+19h 38m 47s} (current),
                 295.212d {+19h 40m 51s} (1950)
GRB_DEC:         +76.820d {+76d 49' 12"} (J2000),
                 +76.842d {+76d 50' 31"} (current),
                 +76.702d {+76d 42' 08"} (1950)
GRB_ERROR:       1.81 [deg radius, statistical only]
DATA_SIGNIF:     45.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15000 TJD;   169 DOY;   09/06/18
GRB_TIME:        30506.66 SOD {08:28:26.66} UT
GRB_PHI:         295.00 [deg]
GRB_THETA:       135.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        87.00d {+05h 47m 59s}  +23.41d {+23d 24' 32"}
SUN_DIST:         78.35 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.66d {+01h 30m 39s}  +15.07d {+15d 04' 17"}
MOON_DIST:        74.87 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      108.83, 23.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       64.16, 77.33 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:40:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.085d {+19h 36m 20s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.413d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30850.08 SOD {08:34:10.08} UT,   340.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.472
N_STARS:         46
X_OFFSET:        304 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1263 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00355083000msufc0340.fits
SUN_POSTN:        87.00d {+05h 48m 01s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.75d {+01h 31m 00s}  +15.11d {+15d 06' 19"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.57, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:40:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.085d {+19h 36m 20s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.413d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30850.08 SOD {08:34:10.08} UT,   340.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.472
N_STARS:         46
X_OFFSET:        304 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1263 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00355083000msufc0340.fits
SUN_POSTN:        87.00d {+05h 48m 01s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.75d {+01h 31m 00s}  +15.11d {+15d 06' 19"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.57, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:40:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.085d {+19h 36m 20s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.413d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30850.08 SOD {08:34:10.08} UT,   340.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.472
N_STARS:         46
X_OFFSET:        304 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1263 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00355083000msufc0340.fits
SUN_POSTN:        87.00d {+05h 48m 01s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.75d {+01h 31m 01s}  +15.11d {+15d 06' 25"}
MOON_DIST:        74.96 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.57, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:41:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.085d {+19h 36m 20s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
ROLL:            25.413d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30850.08 SOD {08:34:10.08} UT,   340.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     267006854
X_OFFSET:        624 [pixels]
Y_OFFSET:        875 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       784
Y_GRB_POS:       1035
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0345.fits
SUN_POSTN:        87.00d {+05h 48m 01s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.76d {+01h 31m 03s}  +15.11d {+15d 06' 34"}
MOON_DIST:        74.96 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.57, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:41:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.085d {+19h 36m 20s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
ROLL:            25.413d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30850.08 SOD {08:34:10.08} UT,   340.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     267006854
X_OFFSET:        624 [pixels]
Y_OFFSET:        875 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       784
Y_GRB_POS:       1035
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0345.fits
SUN_POSTN:        87.00d {+05h 48m 01s}  +23.41d {+23d 24' 32"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.76d {+01h 31m 03s}  +15.11d {+15d 06' 37"}
MOON_DIST:        74.96 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.57, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:45:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.086d {+19h 36m 21s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.415d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  31379.81 SOD {08:42:59.81} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.636
N_STARS:         162
X_OFFSET:        64 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0869.fits
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.80d {+01h 31m 13s}  +15.13d {+15d 07' 32"}
MOON_DIST:        74.96 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:45:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.086d {+19h 36m 21s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.415d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  31379.81 SOD {08:42:59.81} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.636
N_STARS:         162
X_OFFSET:        64 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0869.fits
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.80d {+01h 31m 13s}  +15.13d {+15d 07' 32"}
MOON_DIST:        74.96 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:46:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.086d {+19h 36m 21s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
POINT_ROLL:      25.415d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  31379.81 SOD {08:42:59.81} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.636
N_STARS:         162
X_OFFSET:        64 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00355083000msufc0869.fits
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.81d {+01h 31m 14s}  +15.13d {+15d 07' 40"}
MOON_DIST:        74.95 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:47:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.086d {+19h 36m 21s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
ROLL:            25.415d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  31379.81 SOD {08:42:59.81} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     267007384
X_OFFSET:        623 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       783
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0874.fits
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.82d {+01h 31m 16s}  +15.13d {+15d 07' 50"}
MOON_DIST:        74.95 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:47:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     355083,   Seg_Num: 0
POINT_RA:        294.086d {+19h 36m 21s} (J2000)
POINT_DEC:       +78.371d {+78d 22' 17"} (J2000)
ROLL:            25.415d
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  31379.81 SOD {08:42:59.81} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     267007384
X_OFFSET:        623 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       783
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00355083000msuni0874.fits
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.02 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.82d {+01h 31m 16s}  +15.13d {+15d 07' 54"}
MOON_DIST:        74.95 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.40, 24.31 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       69.56, 76.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #9512
P. Schady (MSSL-UCL), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P.A. Curran (MSSL-UCL), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), J. Mao (INAF-OAB), R. Margutti (Univ Bicocca&OAB), J. P. Osborne (U Leicester), K. L. Page (U Leicester), P. Romano (INAF-IASFPA), M. H. Siegel (PSU), G. Stratta (ASDC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 08:28:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090618 (trigger=355083). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 294.021, +78.353 which is
```
   RA(J2000) = 19h 36m 05s
   Dec(J2000) = +78d 21' 13"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed multi peak structure with a duration of about 130 sec. The peak count rate was ~40,000 counts/sec (15-350 keV), at 80 sec after the trigger.
The XRT began observing the field at 08:30:30.8 UT, 120.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 293.9897, +78.3576 which is equivalent to:
```
   RA(J2000)  = 19h 35m 57.52s
   Dec(J2000) = +78d 21' 27.3"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 28 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 128 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:35:58.69 = 293.99456 DEC(J2000) = +78:21:24.3 = 78.35676 with a 90%-confidence error radius of about 0.74 arc sec. This position is 4.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.36 with a 1-sigma error of about 0.01. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is P. Schady (ps AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Jun 09 08:49:58 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     355083,   Seg_Num: 0
GRB_RA:          293.9945d {+19h 35m 58.68s} (J2000),
                 293.8819d {+19h 35m 31.64s} (current),
                 294.5793d {+19h 38m 19.02s} (1950)
GRB_DEC:         +78.3568d {+78d 21' 24.4"} (J2000),
                 +78.3782d {+78d 22' 41.4"} (current),
                 +78.2423d {+78d 14' 32.1"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         14.34 +/- 0.01 [mag]
FILTER:          10, White
IMG_START_DATE:  15000 TJD;   169 DOY;   09/06/18
IMG_START_TIME:  30641.00 SOD {08:30:41.00} UT,   131.2 [sec] since BAT Trigger Time
SUN_POSTN:        87.01d {+05h 48m 02s}  +23.41d {+23d 24' 33"}
SUN_DIST:         77.04 [deg]   Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN:       22.84d {+01h 31m 21s}  +15.14d {+15d 08' 23"}
MOON_DIST:        74.97 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      110.38, 24.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       69.58, 76.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 4.3 arcsec from the XRT position.

GCN Circular #9513
S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:
We have imaged the field of GRB090618 (Swift trigger 355083) with the automated Palomar 60-inch telescope beginning at 08:30 UT on 18 June 2009 (approximately 2 minutes after the burst). At the edge of the XRT error circle we detect a bright point source with coordinates:
RA: 19:35:58.68 Dec: +78:21:24.4 (J2000.0)
Using several SDSS stars in the field as reference, we estimate an initial magnitude of r' ~ 13.8. Given the brightness of the source, we consider it highly likely to be the optical afterglow of GRB090618.
Further observations are ongoing.
GCN Circular #9514
D. A. Perley reports on behalf of the KAIT GRB team:
The Katzman Automatic Imaging Telescope (KAIT) responded to GRB 090618 and began taking data at 08:31:10 (UT). A bright (~14th magnitude) optical afterglow is visible in the initial set of exposures at the following position:
```
RA   19:35:58.80
dec +78:21:25.5
```
Further follow-up is in progress.
GCN Circular #9515
W. Rujopakarn (Steward), T. Guver (U Arizona), S. B. Pandey (Michigan), and F. Yuan (Michigan) report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 090618 (Swift trigger 355083, Schady et al., GCN 9512). The first image was at 08:28:53.7 UT, 23.9 s after the burst (6.7 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a 14.1 magnitude source with coordinates:
19:35:58.65 +78:21:24.03 (J2000), with positional uncertainty of 1" or better
```
start UT    	mag     mlim(of image)
----------------------------------
08:28:29.8     14.1	16.2
```
This source is not visible in DSS (second epoch), 2MASS or the MPChecker database. Continuing observations are in progress.
GCN Circular #9516
S. Campana (INAF-Osservatorio astronomico di Brera) and the XMM-Newton SOC (ESAC)
XMM-Newton will observe GRB 090618 at location (RA=19h 35m 58.69s, DEC=-+78d 21' 24.4", J2000), starting at 13:30 UT, on June 18, 2009, for an exposure of 24 kiloseconds. Coordinated observations are welcome.
GCN Circular #9517
W. Li, D. A. Perley, and A. V. Filippenko, University of California at Berkeley, on behalf of the KAIT GRB team:
We have analyzed the KAIT observations on GRB 090618 (GCN 9512) as reported in GCN 9514. Our first 2s unfiltered observation started at 08:29:44 UT, 75 s after the BAT trigger. The OA as reported in GCN 9512, 9513, 9514, and 9515 is clearly detected. Subsequent observations show that the OA declined and reached a bottom at t=92 s, then brightened and reached a peak at t=120 s. After the peak, the OA declined as a smooth power-law, with an obvous change of decay index at t ~ 600 s (from alpha = -1.08 +/- 0.05 to -0.70 +/- 0.02). Selected photometry, all unfiltered calibrated to the R band via USNO B1:
```
t_mid(seconds) exp(s)     mag   mag_err
---------------------------------------
          76    2.0      13.61  0.03  
          92    2.0      13.99  0.04  
         117    2.0      13.50  0.03  
         237   20.0      14.02  0.02 
         436   20.0      14.73  0.02  
         729   20.0      15.26  0.02 
	2601   20.0      16.22  0.02 
        7329  120.0      17.02  0.03  
```
GCN Circular #9518
S. B. Cenko, D. A. Perley (UC Berkeley), V. Junkkarinen, M. Burbidge (UC San Diego), and K. Miller (UCO Lick Observatory) report on behalf of a larger collaboration:
We have obtained a spectrum of the afterglow (GCNs 9512, 9513, 9514, 9515) of GRB 090618 with the KAST spectrograph on the 3-m Shane telescope at Lick Observatory. Observations began at 08:48 UT on 18 June 2009, approximately 20 minutes after the burst. On the blue channel (using the 830/3460 grism, providing wavelength coverage from 3200 - 4400 A), we detect a number of strong absorption features that we identify as Mg II, Mg I, and Fe II at a common redshift of z = 0.54. We believe this likely to be the redshift of the GRB, as the lack of Lyman-alpha absorption limits the GRB host to lie at z <~ 1.6.
Further analysis is in progress.
GCN Circular #9519
A. Carraminana (INAOE), C. Alvarez Ochoa (UNACh) and G. Miramon (OAGH-INAOE) report:
We clearly detected the optical counterpart of GRB 090618 (GCN 9512) with the 2.1m telescope of the Observatorio Astrofisico Guillermo Haro at Cananea, Sonora, Mexico. Observations started at 08:43 UT, 14 minutes after the BAT trigger and continued until dawn. Observations were made under non photometric conditions.
We measured a lineal faddening of the burst compared to a reference star of amplitude 0.5 magnitudes between t=870s to 1600s. A non calibrated graph is available at
http://www.inaoep.mx/~alberto/gamma/grb090618_lc.jpg
Spectroscopic data were also obtained and are under analysis.
GCN Circular #9520
A.Melandri (Liverpool JMU), C. Guidorzi (U. Ferrara), D. Bersier, Z. Cano, I.A. Steele, C.G. Mundell (Liverpool JMU), P. O'Brien, N. Tanvir (U. Leicester) on behalf of a larger collaboration report:
We have been monitoring the field of GRB090618 (Swift trigger 355083), with the Faulkes Telescope North (Hawaii), starting ~80 minutes after the trigger time (Schady et al. GCN 9512).
Observations were performed with BVRi filters. The optical afterglow reported by Cenko (GCN 9513), Perley (GCN 9514) and Rujopakarn et al. (GCN 9515) is clearly visible and detected in all filters. We find a magnitude of R=17.01 +- 0.03 (at 2.5 hrs after the burst) and R=17.25 +- 0.05 (at 3.1 hrs). We confirm the decay of alpha~0.7 reported by Li et al. (GCN 9517).
Observations are continuing.
GCN Circular #9521
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2422 s of XRT Photon Counting mode data and 5 UVOT images for GRB 090618, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 293.99304, +78.35702 which is equivalent to:
```
RA (J2000): 19h 35m 58.33s
Dec (J2000): +78d 21' 25.3"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9522
M. Im, W.K. Park (CEOU/Seoul National Univ) and Y. Urata (NCU) on behalf of EAFON team.
We observed GRB090618 (Schady et al. GCN 9512) in R using the 1.0m telescope at Mt. Lemmon (Arizona, US) operated by the Korea Astronomy Space Science Institute. The observation started about 50min after the BAT trigger.
The first image taken with the mid-point at June 18, 09:52 UT (53m42s after the BAT trigger) shows a clear detection of the afterglow at R=15.9 +- 0.1 mag, reported earlier by a number of groups (GCN 9513, 9514, 9515, 9520). The photometry was calibrated against R1mag of USNO-B1 stars in the vicinity of GRB. More data were taken, and they are being analyzed.
We thank the LOAO operator, Y. Baek for her assistance of this observation.
GCN Circular #9524
F. Longo, E. Moretti, G. Barbiellini, E. Vallazza (INFN Trieste), M.Trifoglio, A. Bulgarelli, F. Gianotti F. Fuschino, M. Marisaldi, C.Labanti, M.Galli, G.DiCocco (INAF/IASF Bologna), S. Cutini, C. Pittori (ASDC), M.Tavani, E.Striani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), E. Del Monte, M. Feroci, Y. Evangelista, I. Donnarumma, L. Pacciani, P. Soffitta, E. Costa, F.Lazzarotto, I. Lapshov, M. Rapisarda (INAF/IASF Rome) A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milano), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A. Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:
The AGILE satellite detected GRB 090618 (P. Schady et al. GCN #9512) at about 36 degrees off axis.
Super-AGILE, operating in the 18-60 keV energy range, triggered and localized the burst in the 1-D region of the field of view at a position consistent with the Swift/BAT localization. The emission from this bright GRB with a complex lightcurve was detected at high significance despite the large off-axis direction.
AGILE-MCAL, operating in the 350 keV - 100 MeV energy range, triggered this GRB at 08:28:24.772 UT (T0). The MCAL overall burst duration is about 100 sec. The burst is composed by three main pulses, the brightest starting at T0+62sec and lasting about 14 seconds. The total MCAL spectrum between T0 and T0+120 sec can be fit by a simple powerlaw with photon index 3.16 (-0.30, +0.39) (90% c.l.), with reduced chi^2 0.99 (9 d.o.f.), in the 0.5-10 MeV energy range. The estimated fluence is (3.2 +/- 0.6) 10^{-5} erg cm^-2 in the same energy range.
From a preliminary analysis of the AGILE-GRID data in the energy range 30 MeV-30 GeV no significant gamma-ray emission above 30 MeV is detected in the GRB error box during both the first and second main pulse for a total duration of about 130 sec. A preliminary upper limit is 0.1 ph cm^-2 over a 130 s duration.
GRB 090618 provides a clear evidence for a class of GRBs bright below a few MeV, showing the lack of significant gamma-ray emission above 30 MeV.
GCN Circular #9526
Daniele Malesani (DARK/NBI) reports:
I inspected the SDSS images of the field of GRB 090618 (Schady et al., GCN 9512). A faint object is visible in the r and i frames at the position of the optical afterglow (e.g. Schady et al., GCN 9512; Cenko, GCN 9513), likely the host galaxy of the GRB. Nothing convincing is visible in the u, g, and z images. Compared to nearby SDSS stars, the magnitudes are r = 22.7 +- 0.3 and i = 22.2 +- 0.4. The bright host magnitude is consistent with the low redshift reported by Cenko et al. (GCN 9518)
A supernova as bright as SN 1998bw (Galama et al. 1998, Nature, 395, 670) would peak at r(AB) ~ 23.6 at z=0.54.
GCN Circular #9527
P. Schady (MSSL-UCL) reports on behalf of=C2=A0the Swift UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090618 129s= =20 after the BAT trigger (Schady et al., GCN Circ. 9512) and a=20 decaying=C2=A0source is detected in all UVOT filters at the position repo= rted=20 in Schady et al. (GCN Circ. 9512), consistent with refined XRT error=20 circle=C2=A0(Evans et al., GCN Circ. 9521) as well as the optical aftergl= ow=20 position reported in a number of other GCNs (GCN Circ. 9512, 9514, 9515).= =20 The detection of the afterglow of GRB 090618 in all filters puts=C2=A0an = upper=20 limit on the redshift=C2=A0of z < 1.7, consistent with the redshift const= raints=20 reported by Cenko et al. (GCN Circ. 9518).
The magnitudes for the first UVOT observation of GRB 090618 in each filte= r=20 are as follows:
```
Filter  T_start(s)  T_stop(s)  Exp(s)      Mag
white      129        279       147    14.27+/-0.01
v          671        691       19     15.60+/-0.09
b          596        616       19     15.92+/-0.06
u          340        590       246    14.62+/-0.01
uvw1       720        740       19     15.09+/-0.08
uvm2       695        715       19     15.23+/-0.12
uvw2       647        667       19     15.27+/-0.10
```
The values quoted above are not corrected for the Galactic extinction due= =20 to the reddening of E(B-V) =3D 0.09 in the direction of the burst=20 (Schlegel=C2=A0et al. 1998). The photometry is on the UVOT photometric sy= stem=20 described=C2=A0in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9528
A.P. Beardmore (U. Leicester) and P. Schady (MSSL-UCL) report on behalf of the Swift-XRT team:
We have analysed 12.3 ks of Swift-XRT data for GRB 090618 (Schady et al. GCN Circ. 9512), from 124 s to 25.7 ks after the BAT trigger. The data span five orbits and comprise 2.3 ks in Windowed Timing (WT) mode and 10.0 ks in Photon Counting (PC) mode. The UVOT-enhanced XRT position for this burst was reported by Evans et al. (GCN 9521).
The burst was initially very bright in X-rays, observed at a rate of ~8000 count s^-1, and decayed rapidly with a slope of ~6, before breaking at T+310 s to a shallower decay slope of 0.71 +/- 0.02. A further break is seen at T+4700 s with the decay steepening to 1.22 +/- 0.05.
The WT spectrum from T+250 s to T+1065 s can be fit by an absorbed powerlaw with a photon index of 2.11 +/- 0.03 and intrinsic absorption of (1.78 +/- 0.14) x 10^21 cm^-2 (at z=0.54, Cenko et al., GCN 9518), in addition to the Galactic column of 5.8 x 10^20 cm^-2 in the direction of the source (Kalberla et al. 2005). The observed 0.3-10 keV flux for this model is (8.2 +0.2 -0.1) x 10^-10 erg cm^-2 s^-1. The corresponding unabsorbed flux is (1.16 +/- 0.02) x 10^-9 erg cm^-2 s^-1.
If the light curve continues to decay at the same rate we predict a count rate of 0.13 count s^-1 at T+24 hours, which corresponds to an observed (unabsorbed) 0.3-10 keV flux of 4.9 x 10^-12 (7.2 x 10^-12) erg cm^-2 s^-1.
The results of the XRT team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00355083.
This circular is an official product of the Swift-XRT team.
GCN Circular #9529
Adria Updike, Sean Brittain, Dieter Hartmann (Clemson University), Andrew Colson, Renata Cumbee, Brianne Hackett, Josiah Lewis, and Marten Kronberg (SARA REU) report:
We observed the field of GRB 090618 (Schady et al., GCN 9512) using the 0.9m SARA telescope at Kitt Peak National Observatory beginning 1.5 hours after the trigger and continuing for 2 hours. Our observations consisted of 45 sec exposures in the I and R bands. The afterglow was detected in every image. Magnitudes are given below as compared to the USNOB.1 catalog. Time is given in seconds after the trigger; exposure time in seconds.
```
Time   Filter   Exp      Mag
------------------------------------
5400     I      45     16.2 +/- 0.05
6300     R      45     16.8 +/- 0.05
```
Further observations are planned.
http://www.saraobservatory.org/
GCN Circular #9530
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), P. Schady (MSSL-UCL), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-5 to T+320 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090618 (trigger #355083) (Schady, et al., GCN Circ. 9512). The BAT ground-calculated position is RA, Dec = 294.008, 78.352 deg, which is
```
   RA(J2000)  =  19h 36m 01.8s
   Dec(J2000) = +78d 21' 07.1"
```
with an uncertainty of 0.46 arcmin, (radius, sys+stat, 90% containment). The partial coding was 62.5%.
The mask-weighted light curve shows two episodes with four prominent peaks. The first episode is a smooth 50 sec peak starting at T-5 sec, and ends at T+45 sec. The second episode is about 275 second long and consists of three overlapping peaks. The second episode starts at ~T+45 sec, the first peak is around T+62 sec, the second peak is around T+80, and the third is around T+112 and finally ends at T+320 sec. Our T90 (15-350 keV) is 113.2 +/- 0.6 sec (estimated error including systematics).
The time-averaged spectrum from T-5 to T+109 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.712 +/- 0.018. The fluence in the 15-150 keV band is 1.06 +/- 0.01 x 10^-4 erg/cm2. The 1-sec peak photon flux measured from T+65.12 sec in the 15-150 keV band is 38.9 +/- 0.8 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/355083/BA/
GCN Circular #9531
Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara), D. Bersier, A. Melandri, I.A. Steele, R.J. Smith, C. Mundell (Liverpool JMU) report, on behalf of a large collaboration:
Following our report of observations (GCN 9520) we continued monitoring the field of GRB090618 (Swift trigger 355083) on the Liverpool Telescope (La Palma) from 13.6 hours to 17.9 hours post burst in R and i bands. Below is a summary of a few R-band images:
```
t_exp  t-T0          R-mag

300s   13.6 hours    18.9 =B1 0.1
300s   15.6 hours    19.1 =B1 0.1
300s   17.9 hours    19.3 =B1 0.1
```
The calibration is still preliminary and determined against stars in the USNO catalog.
We note a break in the R-band light curve, and find a decay index of alpha~1.4 by 17.9 hours post burst, as compared to alpha~0.7 previously reported (GCNs 9517, 9520).
GCN Circular #9532
Guy Pooley (Cavendish Astrophysics, U. Cambridge) reports on behalf of the AMI collaboration:
The AMI Large Array (the rebuilt Ryle Telescope) was used to observe the field of GRB 090618 (Schady et al, GCN9512) on 2009 June 19 from 02h45m to 05h45m UT (18.25 to 21.25h after the burst) using the position from Cenko et al (GCN9213). The observing band was 14.6 to 17.5 GHz and the rms noise 85 microJy. The angular resolution is approx. 50" x 20".
We make a clear detection of a source at the position of the GRB with a flux density 550 microJy. A split of the data suggests that the flux density increased from 425 to 640 microJy between the first and second halves of the observation, but this is barely statistically significant.
There is no radio source visible at that position in the NVSS (1.4GHz).
This report may be quoted in publications.
GCN Circular #9533
Poonam Chandra (RMC) and Dale A. Frail (NRAO) report on behalf of a larger collaboration:
"We used the Very Large Array to observe the field of view toward the GRB 090618 (GCN 9512) at a frequency of 8.46 GHz on 2009 June 19.33 UT. We observed the radio afterglow of the GRB at P60 optical afterglow position reported by Cenko et al. (GCN 9513). The GRB radio afterglow flux density is 383+/-47 uJy. Further observations are planned.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #9534
T. Sakamoto (GSFC/UMBC), T. N. Ukwatta (GWU/GSFC), S. D. Barthelmy (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-373 to T+962 sec from the recent telemetry downlink, we report further spectral analysis of BAT GRB 090618 (trigger #355083) (Schady, et al., GCN Circ. 9512).
The time-averaged spectrum from T-4.4 to T+213.6 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.42 +/- 0.08, and Epeak of 134 +/- 19 keV (chi squared 14.6 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.05 +/- 0.01 x 10^-04 erg/cm2 and the 1-sec peak flux measured from T+65.38 sec in the 15-150 keV band is 38.8 +/- 0.8 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.72 +/- 0.02 (chi squared 55.8 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/355083/BA/
GCN Circular #9535
Sheila McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team:
"At 08:28:26.66 UT on 18 June 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090618 (trigger 267006508 / 090618353) which was also detected by Swift/BAT (Schady et al. 2009, GCN 9512) and AGILE (Longo et al. 2009, GCN 9524). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 133 degrees.
The GBM light curve consists of 4 pulses with a duration of about 155 s (8-1000 keV). The time-averaged spectrum from T0 to T0+140 s is adequately fit by a Band function with Epeak = 155.5 (+11.1/-10.5) keV, alpha = -1.26 (+0.06/-0.02), and beta = -2.50 (+0.15/-0.33). We observe significant spectral evolution within the fitted time interval.
The event fluence (8-1000 keV) in this time interval is (2.70 +/- 0.06)E-4 erg/cm^2. Using standard cosmology (Omega_matter = 0.27, Omega_lambda = 0.73, H0=71) and the reported redshift of 0.54 (Cenko et al. 2009, GCN 9518) the isotropic equivalent energy in the 8-1000 keV band is E_iso = 2.0E+53 erg.
The 1-sec peak photon flux measured starting from T0+63 s in the 8-1000 keV band is 73.4 +/- 2.0 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #9536
A. Fernandez-Soto (IFCA-Santander), V. Peris (OAUV-Valencia), and J. Alonso-Lorite (OAUV-Valencia) report:
We have observed the field of GRB090618 (Schady et al., GCN 9512) with the OAUV-0.4m telescope at the Observatorio Astronomico de Aras (OAA) in Aras de Alpuente (Valencia, Spain). Observations began after local sunset on June 18 (UT 19:32, (t-t0)~11.1 hours).
We took 23 four-minute exposures using a Johnson R filter. The individual frames have been combined in five groups. The afterglow reported in GCN9512 and confirmed by Cenko et al. (GCN 9513) is clearly detected in all five images, with magnitudes and times:
```
UT(middle)   Exposure    R    Error
----------   --------  -----  -----
  21:30:03     5x4min   18.67   0.14
  21:50:51     5x4min   18.57   0.09
  22:42:14     4x4min   18.62   0.09
  23:21:44     5x4min   18.92   0.13
  23:45:19     2x4min   18.96   0.13
```
All magnitudes have been calibrated using stars in the field and the USNO-B1 catalog (R1 mags).
Our results agree with those reported by Cano et al. (GCN 9531), and support the presence of a break in the R-band decay, which happened at (t-t0) ~ 14.6 hours.
A lightcurve combining our data and previous GCNs is posted at http://ayalga.uv.es/~fsoto/grb090618
OAA is operated by the Observatori Astronomic de la Universitat de Valencia (OAUV).
GCN Circular #9537
S. Dado and A. Dar report:
The inferred photon spectral index Gamma=2.01+/-0.05 of the early time X-ray afterglow of the relatively nearby bright GRB090618 (z=1.54, GCN 9518) from the Swift XRT observations (Evans et al. http://www.swift.ac.uk/xrt_spectra/00355083/) implies, in the CB model (e.g. ApJ 696 (2009), 994), an asymptotic achromatic power-law decline of the afterglow with a spectral index beta=1.01+/-0.05 and a temporal index alpha=beta+1/2=1.51+/-0.05. The R-band light curve of the anticipated underlying supernova akin to SN1998bw is expected to reach maximum brightness magnitude R=23.9 (Galactic extinction included) around July 10, 2009 (approximately 22 days after GRB090618). Using the latest optical measurements reported in GCN 9531 and GCN 9536, the GRB afterglow is expected to decay by July 10, 2009 to a magnitude R=24.6+/-0.20 yielding R=23.4+/-0.3 for the optical transient superposed on a bright host galaxy with r=22.7 +/- 0.3 (GCN 9526). Like in the case of GRB 030319 (ApJ 594 (2003), L89), the search for an underlying supernova (GCN 9526) in GRB060618 may be more successful using large telescopes with high resolution for photometric and/or spectroscopic follow up measurements of its optical afterglow.
GCN Circular #9538
Atish Kamble (University of Amsterdam), A.J. van der Horst (NASA/ORAU) and Ralph Wijiers (University of Amsterdam) reports on behalf of a larger collaboration :
"We observed the position of GRB 090618 afterglow at 4.9 GHz using the Westerbork Synthesis Radio Telescope between June 19.78 to 20.30 UT i.e. 1.7 days after the burst (GCN 9512, GCN 9532, GCN 9533). The radio afterglow was clearly detected and its measured flux density is about 501 +/- 47 microJy.
We would like to thank the WSRT staff for scheduling and carrying out these observations."
GCN Circular #9539
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the afterglow (Schady et al., GCN 9512; Cenko et al., GCN 9513; Perley, GCN 9514; Rujopakarn et al., GCN 9515) of the Swift GRB 090618 between (UT) Jun. 18 19:51 - Jun. 19 00:51 with Shajn telescope of CrAO. We detect afterglow in every BVRI of 60 s exposure images of the series. Coordinates of the afterglow are RA(J2000): 19 35 58.77 Dec(J2000): +78 21 24.2 with uncertainties of 0.3 arcsec.
Preliminary photometry of selected images based on USNO-B1.0 star 1683-0077955 (RA=19 36 36.34 Dec=+78 21 07.00) assuming R=16.57 is following:
```
T0+     Filter, Exposure, mag.,     err.
(d)             (s)

0.4763   R       60     18.60 +/-0.05
0.5680   R       60     18.87 +/-0.03
0.6496   R       60     19.17 +/-0.04
0.6796   R       60     19.19 +/-0.10
```
The power low index of light curve approximation between 0.48 - 0.65 days is ~ -1.6, while after 0.65 days after burst onset we observe flattening of the light curve. A finding chart can be found at http://grb.rssi.ru/GRB090618/GRB090618_090618_R_ZTSh.gif
GCN Circular #9541
M. Im (CEOU/Seoul National Univ), Y.-B. Jeon (KASI), and Y. Urata (NCU)
We observed GRB090618 (Schady et al. GCN 9512) in V using a 15.5cm refractor at Bohyunsan Optical Astronomical Observatory in Korea, operarted by the Korea Astronomy Space Science Institute. A series of exposures were taken starting at 2009 June 18, 11:54:19. The afterglow, identified earlier by many groups (GCN 9513, 9514, 9515, 9520, 9522), was clearly detected at V=17.9 +- 0.1 magnitude at mid-time of 2009 12:55:07 (about 4hr 26.6min after the BAT trigger). The photometry was calibrated against nearby SDSS stars where the transformation of SDSS magnitude to V-band magnitude was carried out using the recipe of Chonis & Gaskell (2008).
GCN Circular #9542
T. Fatkhullin, A. Moskvitin (SAO-RAS Niznijh Arkhyz, Russia), A.J. Castro-Tirado (IAA-CSIC Granada), A. de Ugarte Postigo (ESO, INAF/OAB), on behalf of a larger collaboration, report:
We have observed the field of GRB090618 (Schady et al., GCN 9512) with the 6-m telescope of the SAO RAS in Caucasus. We obtained B, Rc and Ic images as well as a low-resolution spectrum under non favorable weather conditions. The range and resolution of the spectrum were 3900-9200AA and FWHM=15-17A, respectively. A preliminary processing of the spectrum showed a faint emission line at 5748.55A which we interpret as [OII] 3727A. A corresponding redshift of 0.54 is in full agreement with one obtained by Cenko et al. (GCN 9518). Because of strong night sky OH bands and low resolution of the spectrum we could not clearly detect expected Hbeta and [OIII]4959,5007A lines. The photometry was calibrated using a number of SDSS stars in the field. Below we present a summary of some of our observations:
```
               middle date, UT         results
   -------------------------------------------------------
   spectrum   19.977 June 2009      [OII]3727A detection
          Rc     19.941 June 2009      20.51 +/- 0.06
```
This message can be cited.
GCN Circular #9548
A. Galeev, I. Bikmaev, N. Sakhibullin (KSU/AST), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
report:
We observed the OT (Schady et al., GCN 9512; Cenko et al., GCN 9513; Perley, GCN 9514; Rujopakarn et al., GCN 9515) of the Swift GRB 090618 with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), in BRc bands, starting at 22 Jun, 00:03 UT, i.e. approximately 3.65 days after the burst, using TFOSC.
We made 3x900s exposures in Rc band and 2x900 in B band. The OT is detected in all images. Using the same USNO-B1 star as it was used by Rumyantsev and Pozanenko (GCN 9539) we estimate Rc magnitude as m_Rc=21.60+/-0.04 (3.68 days after the burst).
The finding chart can be found at:
http://hea.iki.rssi.ru/grb/090618/indexeng.html
GCN Circular #9553
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, and D. Svinkin on behalf of the Konus-Wind and Konus-RF teams, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 090618 (Schady et al. 2009, GCN 9512) triggered Konus-Wind at T0=3D30504.974 s UT (08:28:24.974), and Konus-RF instrument onboard CORONAS-PHOTON s/c at T0=3D30507.060 s UT (08:28:27.060).
The burst light curve shows a smooth multi-peaked structure with a duration of ~160 s. Significant spectral evolution was observed during the burst.
As observed by Konus-Wind the burst had a fluence of (2.5 =B1 0.06)x10-4 erg/cm2, and a 64-ms peak flux measured from T0+63.616 s of (1.6 =B1 0.2)x10-5 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+142 s) can be fitted (in the 20 keV - 2 MeV range) by GRB (Band) model for which: the low-energy photon index alpha =3D -1.28 =B1 0.02, the high energy photon index beta =3D -2.66(-0.2, +0.14), the peak energy Ep =3D 186 =B1 8 keV (chi2 =3D 103/60 dof).
The spectrum at the maximum count rate, measured from T0+62.720 to T0+64.0 s, is well fitted (in the 20 keV - 2 MeV range) by GRB (Band) model for which: the low-energy photon index alpha =3D -0.99 (-0.06, +0.07), the high energy photon index beta =3D -2.29(-0.5, +0.23), the peak energy Ep =3D 440 =B1 70 keV (chi2 =3D 52/55 dof).
As observed by Konus-RF the burst had a fluence of (2.82 =B1 0.06)x10-4 erg/cm2 (both in the 20 keV - 2 MeV energy range), and a 500-ms peak flux measured from T0+63.0 s of (1.6 =B1 0.1)x10-5 erg/cm2/s (in the 20 keV - 1.5 MeV energy range).
The time-integrated spectrum of the burst (from T0-1.4 to T0+113.0 s) can be fitted (in the 20 keV - 2 MeV range) by GRB (Band) model for which: the low-energy photon index alpha =3D -1.28 =B1 0.03, the high energy photon index beta =3D -3.06(-0.5, +0.3), the peak energy Ep =3D 220 =B1 8 keV (chi2 =3D 240/132 dof).
The spectrum at the maximum count rate, measured from T0+63.0 to T0+63.5 s, is well fitted (in the 20 keV - 1.5 MeV range) by GRB (Band) model for which: the low-energy photon index alpha =3D -0.89 (-0.1, +0.3), the high energy photon index beta =3D -2.56(-1.0, +0.6), the peak energy Ep =3D 385 (-136, +64) keV (chi2 =3D 78/74 dof).
All the quoted values are preliminary. The quoted errors are at the 90% confidence level.
The light curves of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB090618_T30504/
GCN Circular #9563
A. N. Morgan, C. R. Klein, J. S. Bloom, (UC Berkeley), report:
We observed the location of the optical afterglow of GRB 090618 (Schady et al., GCN 9512) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2009-06-18 08:29:40 UT, 71 seconds after the Swift Trigger, under non-ideal sky conditions. In the initial images, we detect a variable infrared source (identified as the IR afterglow) in individual frames of 7.8 second simultaneous exposures in the J, H, and Ks bands.
The preliminary photometry on selected stacks of images yield the following photometry:
```
time
post burst exp.   filt  mag   m_err
[s]        [s]

210        93.6   J     12.7  0.1
210        93.6   H     12.1  0.1
210        93.6   Ks    11.4  0.2

2818       327    J     15.1  0.1
2818       327    H     14.6  0.1
2818       327    Ks    13.7  0.1

10636      585    J     16.2  0.2
10636      585    H     15.7  0.2
10636      585    Ks    >14.8 3-sigma
```
Intermittent clouds led to highly variable transmission and sky brightnesses during the PAIRITEL observations. All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Further analysis is ongoing.
GCN Circular #9568
K. Kono, A. Daikyuji, E. Sonoda, N. Ohmori, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), W. Iwakiri, M. Tashiro, Y. Terada, A. Endo, K. Onda, T. Sugasahara (Saitama U.), Y. Urata (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), on behalf of the Suzaku WAM team, report:
The bright, long GRB 090618 was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 08:28:25.592 UT (=T0). The observed light curve shows a multi-peaked structure starting at T0-5 s and ending at T0+149 s, with a duration (T90) of about 105 seconds. The fluence in 100 - 1000 keV was (1.58 $B!^(B 0.07) x10-4 erg/cm2. The 1-s peak flux measured from T0+65 s was 20.7 (-0.9, +0.8) photons/cm2/s and 9.83(-0.36, +0.26) x10-5 erg/cm2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-5 s to T0+149 s is well fitted by a single power-law with a photon index of 2.32 $B!^(B 0.04 (chi2/d.o.f = 51/51). The 1-s peak spectrum is well fitted by a power-law with exponential cutoff model:
```
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha: 1.21 $B!^(B 0.13, and
Epeak: 623 (-39, +44) keV (chi2/d.o.f. = 41/50).
```
Due to the brightness of this burst, a 3% systematic error was added for low energy channels. All the quoted errors are at 90% confidence level,
The light curves for this burst are now available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html

GCN Circular #9570
K. Kono (Univ. of Miyazaki), on behalf of the Suzaku WAM team, report:
There are some garbled characters and a wrong value reported in Kono et al. (GCN 9568).
The correct values are as follows:

1-s peak flux                :  9.83 (-0.36, +0.26) x 10^-6 erg/cm^2/s
The fluence in 100 - 1000 keV: (1.58 +/- 0.07) x 10^-4 erg/cm^2
The photon index
for time-averaged spectrum :    2.32 +/- 0.04
alpha for 1-s peak spsctrum:    1.21 +/- 0.13

We apologize for any inconvenience.

GCN Circular #9575
Adria Updike, Sean Brittain, Dieter Hartmann (Clemson University), Andrew Colson, Renata Cumbee, Brianne Hackett, Josiah Lewis, and Marten Kronberg (SARA REU) report:
We re-observed the field of GRB 090618 (Schady et al., GCN 9512) using the 0.9m SARA telescope at Kitt Peak National Observatory beginning 20 hours after the trigger and continuing for 3 hours. Our observations consisted of 45 sec exposures in the R and I bands under good conditions. The afterglow is detected in stacked images. Magnitudes are given below as compared to the USNOB.1 catalog. Time is given in days after the trigger; exposure time in seconds.
```
Time   Filter   Exp      Mag
------------------------------------
0.84     R      1215     19.4 +/- 0.1
0.86     I      1215     18.8 +/- 0.1
```
http://www.saraobservatory.org/
GCN Circular #9576
G.C. Anupama, U.K. Gurugubelli, D.K. Sahu report
Optical afterglow of GRB090618 (Schady et al., GCN 9512) was observed with the 2m. Himalayan Chandra Telescope of the Indian Astronomical Observatory, Hanle, India. The optical afterglow was observed in Bessell R filter and it was detected in all the frames.
The preliminary magnitude of the optical afterglow, calibrated using the USNO B1 (R1 magnitude) of the nearby stars in the GRB field is as under:
```
 Date         Mid UT    Exposure       R Mag     Error
 18-06-2009   19:29     300sec         18.70     0.07
 18-06-2009   19:36     300sec         18.75     0.06
 19-06-2009   22:08     2x300+450      20.30     0.09
```

GCN Circular #9592
Further to GCN 9532, Guy Pooley (Cavendish Astrophysics, U. Cambridge) reports on behalf of the AMI consortium that the radio emission at 15 GHz from GRB090618 has faded. Data from the AMI Large Array are given below, including data taken on 090619 reported in GCN 9532:

yymmdd.ddd      hhmm-hhmm       S       rms
                   UT         microJy microJy 
090619.073      0245-0415       425     120
090619.208      0415-0545       640     120

090620.182      0340-0505       415      87
090621.275      0536-0736       139      91
090622.175      0328-0457        63      96

090627.021      0013-0048      -127     190

These results may be quoted in publications.

GCN Circular #9597
I. Khamitov, M. Parmaksizoglu, T. Ak, Z. Eker (TUG), Z. Aslan (Kultur Uni.), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (KSU/AST),
report:
We observed the OT (Schady et al., GCN 9512; Cenko et al., GCN 9513; Perley, GCN 9514; Rujopakarn et al., GCN 9515) of the Swift GRB 090618 with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), in Rc band during three nights 25,26 and 27 June 2009 and in B band in 26 June.
Every night we made 3x900s exposures in Rc band and in 26 June we made additionally 3x900 in B band. The OT is detected in all stacked images in Rc. The brightness of OT is not changed inside of photometric error. Our preliminary estimate of its magnitude during these observations is m_Rc=22.3+/-0.1 (7.68, 8.64, 9.58 days after the burst).
We found no OT on stacked B-image. The limiting magnitude of the frame is mlim_B=23.4 (8.68 days after the burst).
GCN Circular #9613
E. Klunko (ISTP), A. Volnova (SAI MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the afterglow (Schady et al., GCN 9512; Cenko et al., GCN 9513; Perley, GCN 9514; Rujopakarn et al., GCN 9515) of the Swift GRB 090618 between (UT) Jun. 18 18:14 -- 18:43 with 1.5m telescope of Sayan observatory (Mondy). The afterglow is detected in stacked images. Preliminary photometry of the stacked images based on USNO-B1.0 star 1683-0077955 (RA=19 36 36.34 Dec=+78 21 07.00) assuming R=16.57 is following:
```
T0+     Filter, Exposure, mag.,     err.
(d)             (s)

0.4083   R       10x30     18.60 +/-0.10
```
GCN Circular #9665
Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
A. R. Rao, J. P. Malkar, M. K. Hingar, V. K. Agrawal (TIFR, Mumbai, India), S. K. Chakrabarti, A. Nandi, D. Debnath, T. C. Kotoch (ICSP, Kolkata, India), T. R. Chidambaram, P. Vinod, S. Sreekumar (VSSC, Thiruvananthapuram, India), Y. D. Kotov, A. S. Buslov, V. N. Yurov, V. G. Tyshkevich, A. I. Arkhangelskij, R. A. Zyatkov (MephI, Moscow, Russia) report:
The RT-2 Experiment onboard the CORONAS-PHOTON satellite has clearly detected GRB 090618 (Schady et al., 2009, GCN 9512) which triggered at T0 = 30507.00 sec (UT) (08h 28m 27s). The satellite was in the SHADOW mode (away from the SUN) with GOOD time (away from the polar and SAA regions) observation of 700 sec starting at 08h 23m 27sec (UT) and ending at 08h 36m 46.99sec (UT).
The GRB light curve shows a complex profile (Golenetskii et al., 2009, GCN 9553) of time duration of around 150 sec. The burst profile has three main pulses with the brightest pulse (~700 cts/sec) started at T0+65 sec, the second one at T0+85 sec and the last one at T0+115 sec.
Both RT-2/S and RT-2/G detectors have registered this multi-structured burst profile of the light curve in the energy band of 60 - 215 keV. In high-energy band of 330 - 1000 keV, the profile becomes simple with a single bright peak at T0+65 sec. It is also noted that the burst width decreases with the increase in the energy band, a quiet natural phenomena of GRB burst profile. The burst was incident at an angle of 77 degrees to the detector axis. It showed the typical Band spectrum with peak energy at about 180 keV and integrated 20 keV - 1MeV flux of 2.8 X 10^-4 ergs/ cm^2.
The light curve is available at the web-site: http://csp.res.in/rt2_files/grb090618-lc.html
GCN Report 232.1
GCN_Report 232.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_232_1.pdf by P. Schady at MSSL-UCL titled: "Final Results on Swift GRB 090618"
1110.1994 from 11 Oct 11
RupalBasak et al.: Measuring the pulse of GRB 090618: A Simultaneous Spectral and Timing Analysis of the Prompt Emission
We develop a new method for simultaneous timing and spectral studies of Gamma Ray Burst (GRB) prompt emission and apply it to make a pulse-wise description of the prompt emission of GRB 090618, the brightest GRB detected in the Fermi era. We exploit the large area (and sensitivity) of Swift/BAT and the wide band width of Fermi/GBM to derive the parameters for a complete spectral and timing description of the individual pulses of this GRB, based on the various empirical relations suggested in the literature. We demonstrate that this empirical model correctly describes the other observed properties of the burst like the variation of the lag with energy and the pulse width with energy. The measurements also show an indication of an increase in pulse width as a function of energy at low energies for some of the pulses, which is naturally explained as an off-shoot of some particular combination of the model parameters. We argue that these model parameters, particularly the peak energy at the beginning of the pulse, are the natural choices to be used for correlation with luminosity. The implications of these results for the use of GRBs as standard candles are briefly described.
1111.2230 from 10 Nov 11
L. Izzo et al.: A double component in the prompt emission of GRB 090618
GRB 090618 offered an unprecedented opportunity to have coordinated data, by the best of the X and Gamma Ray observatories, of the nearest (z = 0.54) energetic source (10$^{54}$ erg). Using the Fermi-GBM observations of this GRB, we have analyzed this source to explore the possibility of having components yet to be observed in other sources. We show that it is not possible to interpret GRB 090618 within the framework of the traditional single component GRB model. We argue that the observation of the first episode of duration of around 50s could not be a part of a canonical GRB, while the residual emission could be modeled easily with the models existing in literature. In this work we have considered the case of the fireshell scenario.
1201.1552 from 10 Jan 12
Fu-Wen Zhang: GRB 090618: different pulse temporal and spectral characteristics within a burst
GRB 090618 was simultaneously detected by Swift-BAT and Fermi-GBM. Its light curve shows two emission episodes consisting of four prominent pulses. The pulse in the first episode (episode A) has a smoother morphology than the three pulses in the second episode (episode B). Using the pulse peak-fit method, we have performed a detailed analysis of the temporal and spectral characteristics of these four pulses and found out that the first pulse (pulse A) exhibits distinctly different properties than the others in episode B (pulses B1, B2 and B3) in the following aspects. (i) Both the pulse width ($w$) and the rise-to-decay ratio of pulse ($r/d$, pulse asymmetry) in GRB 090618 are found to be energy-dependent. The indices of the power-law correlation between $w$ and $E$ for the pulses in episode B however are larger than that in episode A. Moreover the pulses B1, B2 and B3 tend to be more symmetric at the higher energy bands while the pulse A displays a reverse trend. (ii) Pulse A shows a hard-to-soft spectral evolution pattern, while the three pulses in the episode B follow the light curve trend. (iii) Pulse A has a longer lag than the pulses B1, B2 and B3. The mechanism which causes the different pulse characteristics within one single GRB is unclear.
1202.4374 from 21 Feb 12
L. Izzo et al.: A double component in GRB 090618: a proto-black hole and a genuinely long GRB
The joint X and gamma-ray observations of GRB 090618 by a large number of satellites offer an unprecedented possibility of testing crucial aspects of theoretical models. In particular, it allows us to test (a) the formation of an optically thick e+e- baryon plasma self-accelerating to Lorentz factors in the range 200 < g < 3000; (b) its transparency condition with the emission of a component of 10^{53-54} baryons in the TeV region and (c) the collision of these baryons with the circumburst medium clouds, characterized by dimensions of 10^{15-16} cm. In addition, these observations offer the possibility of testing a new understanding of the thermal and power-law components in the early phase of this GRB. We test the fireshell model of GRBs in one of the closest (z = 0.54) and most energetic (Eiso = 2.90 x 10^{53} ergs) GRBs, namely GRB 090618. We analyze its emission using several spectral models, with special attention to the thermal and power-law components. We determine the fundamental parameters of a canonical GRB within the context of the fireshell model. We find evidences of the existence of two different episodes in GRB 090618. The first episode lasts 50 s and is characterized by a spectrum consisting of thermal component, which evolves between kT = 54 keV and kT = 12 keV. The second episode, which lasts for \sim 100s, behaves as a canonical long GRB with a Lorentz gamma factor at transparency of g = 495, a temperature at transparency of 29.22 keV and with characteristic masses of the surrounding clouds of \sim 10^{22-24} g. We support the recently proposed two-component nature of GRB 090618 by using specific theoretical analysis and illustrate that the episode 1 cannot be considered to be either a GRB or a part of a GRB event, but it appears to be related to the progenitor of the collapsing bare core leading to the formation of the black hole which we call a proto-black hole.
1206.2887 from 14 Jun 12
L. Izzo et al.: GRB 090618: The First Example of a Neutron Star Gravitational Collapse to a Black Hole Induced by a Type Ib/c Supernova
We use the explicit expression for the accretion rate and the total accreted mass onto a neutron star from a Supernova Ib/c originated from a companion evolved star. We apply these considerations to the exceptional case of GRB 090618, for which there is evidence of a supernova $\sim 10$ days after the GRB occurrence. It is shown that the neutron star reaches in a few seconds the critical mass and undergoes gravitational collapse leading to the emission of a GRB. This approach gives a natural explanation of the temporal coincidence of a type Ib/c Supernova and a GRB. We find for the mass of the neutron star companion, $M_{\rm NS}$, and for the supernova progenitor, $M_{\rm SN-prog}$, the following mass ranges: $1.94\lesssim M_{\rm NS}/M_\odot \lesssim 2.16$ and $3\leq M_{\rm SN-prog}/M_\odot \leq 6$.
1208.0307 from 2 Aug 12
Zach Cano: The Nature of Gamma Ray Burst Supernovae
Gamma Ray Bursts (GRBs) and Supernovae (SNe) are among the brightest and most energetic physical processes in the universe. It is known that core-collapse SNe arise from the gravitational collapse and subsequent explosion of massive stars (the progen- itors of nearby core-collapse SNe have been imaged and unambiguously identified). It is also believed that the progenitors of long-duration GRBs (L-GRBs) are massive stars, mainly due to the occurrence and detection of very energetic core-collapse su- pernovae that happen both temporally and spatially coincident with most L-GRBs. However many outstanding questions regarding the nature of these events exist: How massive are the progenitors? What evolutionary stage are they at when they explode? Do they exist as single stars or in binary systems (or both, and to what fractions)? The work presented in this thesis attempts to further our understanding at the types of progenitors that give rise to long-duration GRB supernovae (GRB-SNe). This work is based on optical photometry obtained for three GRB-SNe events: GRB 060729, GRB 090618 and XRF 100316D (an X-Ray Flash is similar to a L-GRB, but has a lower peak energy). For GRB 060729 and GRB 090618 we model the optical light curves and account for light coming from three sources: the host galaxy, the afterglow and the supernova. When we remove the host flux, and model the afterglow, the re- maining flux resembles that of a SN, both in the shape of the light curve and the shape of the spectral energy distribution. Our investigation of XRF 100316D and its spectroscopically-confirmed Ic-BL SN 2010bh is more detailed as we were able to obtain optical and infrared data in many filters, which we utilize to created a quasi-bolometric light curve that we model to determine physical parameters of the SN...
1302.6091 from 26 Feb 13
Rupal Basak et al.: A new method of pulse-wise spectral analysis of Gamma-ray Bursts
Time-resolved spectral analysis, though a very promising method to understand the emission mechanism of gamma-ray bursts (GRBs), is difficult to implement in practice because of poor statistics. We present a new method for pulse-wise time-resolved spectral study of the individual pulses of GRBs, using the fact that many spectral parameters are either constants or smooth functions of time. We use this method for the two pulses of GRB 081221, the brightest GRB with separable pulses. We choose, from the literature, a set of possible models which includes the Band model, blackbody with a power-law (BBPL), a collection of black bodies with a smoothly varying temperature profile, along with a power-law (mBBPL), and two blackbodies with a power-law (2BBPL). First, we perform time-resolved study to confirm the spectral parameter variations, and then construct the new model to perform a joint spectral fit. We find that any photospheric emission in terms of black bodies is required mainly in the rising parts of the pulses and the falling part can be adequately explained in terms of the Band model, with the low energy photon index within the regime of synchrotron model. Interestingly, we find that 2BBPL is comparable or sometimes even better, though marginally, than the Band model, in all episodes. Consistent results are also obtained for the brightest GRB of Fermi era --- GRB 090618. We point out that the method is generic enough to test any spectral model with well defined parameter variations.
1309.4575 from 19 Sep 13
D. Debnath et al.: Nature of GRBs observed by RT-2 onboard CORONAS-PHOTON Satellite
The RT-2 Experiment, a low energy gamma-ray telescope, onboard CORONAS-PHOTON satellite is designed to study the temporal, spectral and spatial properties of the hard X-ray solar flares mainly in the energy range of 15 - 100 keV, which is extendable upto 1000 keV. During the operational period of ~ 9 months, it has been able to detect a few solar flares and at least four Gamma-Ray Bursts (GRBs). In this paper, we discuss the properties of the GRBs as observed by RT-2 in the energy band of 15 to ~ 1000 keV. We will present the results of spectral and timing properties of the GRBs (specially for the GRB 090618) using RT-2 detectors. Temporal analysis suggests that all four GRBs belong to the category of long duration bursts.
1409.4538 from 17 Sep 14
Rupal Basak et al.: Discovery of Smoothly Evolving Blackbodies in the Early Afterglow of GRB 090618 : An Evidence for a Spine-Sheath Jet?
GRB~090618 is a bright GRB with multiple pulses. It shows evidence of a thermal emission in the initial pulses as well as in the early afterglow phase. We investigate the shape and evolution of the thermal component in the early afterglow/ late prompt emission phase using data from Swift/BAT, Swift/XRT, and Fermi/GBM detectors. An independent fit to the BAT and the XRT data reveals two correlated blackbodies with monotonically decreasing temperatures. Hence we investigated the combined data with a model consisting of two blackbodies and a power-law (2BBPL), a model suggested for several bright GRBs. We elicit the following interesting features of the 2BBPL model: a) the same model is applicable from the peak of the last pulse in the prompt emission to the afterglow emission, b) the ratio of temperatures and the fluxes of the two black bodies remain constant throughout the observations, c) the black body temperatures and fluxes show a monotonic decrease with time, with the fluxes dropping about a factor of two faster than the flux of the power-law emission, d) attributing the blackbody emission to photospheric emissions, we find that the photospheric radii increase very slowly with time, and the lower temperature blackbody shows a radius about 65 times larger than the radius of the higher temperature black body. We find some evidence that the underlying shape of the non-thermal emission is a cut-off power-law rather than a power-law. We sketch a spine-sheath jet model to explain our observations.
1501.0613 from 27 Jan 15
Yuan-Chuan Zou et al.: Constraining the bulk Lorentz factor from the photosphere emission
We propose a direct and model-independent method to constrain the Lorentz factor of a relativistically expanding object, like gamma-ray bursts. Only the measurements, such as thermal component of the emission, the distance and the variable time scale of the light curve, are used. If the uncertainties are considered, we will obtain lower limits of the Lorentz factor instead. We apply this method to GRB 090618 and get a lower limit of the Lorentz factor to be 22. The method can be used to any relativistically moving object, such as gamma-ray bursts, blazars, and soft gamma-ray repeaters, providing the thermal component of the emission being observed.

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Jochen Greiner, last update: 27-Jan-2015 [Disclaimer]