Gamma-ray Burst 100615A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 01:59:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.207d {+11h 48m 50s} (J2000),
                 177.340d {+11h 49m 22s} (current),
                 176.572d {+11h 46m 17s} (1950)
GRB_DEC:         -19.496d {-19d 29' 45"} (J2000),
                 -19.554d {-19d 33' 14"} (current),
                 -19.218d {-19d 13' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2726 [cnts]    Image_Peak=219 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   124     E_range: 25-100 keV
BKG_INTEN:       26124 [cnts]
BKG_TIME:        7130.10 SOD {01:58:50.10} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7143.99 SOD {01:59:03.99} UT
GRB_PHI:         -25.88 [deg]
GRB_THETA:        18.01 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.87 [sigma]
IMAGE_SIGNIF:    10.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +0  +0  +0 +19  +0 
SUN_POSTN:        83.34d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.11 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.71d {+08h 02m 50s}  +18.99d {+18d 59' 18"}
MOON_DIST:        67.59 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      185.50,-18.93 [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 = 224.76,-19.27 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 15 Jun 10 01:59:22 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     298259946
GRB_RA:          165.433d {+11h 01m 44s} (J2000),
                 165.561d {+11h 02m 15s} (current),
                 164.824d {+10h 59m 18s} (1950)
GRB_DEC:         -23.717d {-23d 42' 59"} (J2000),
                 -23.773d {-23d 46' 22"} (current),
                 -23.448d {-23d 26' 50"} (1950)
GRB_ERROR:       7.38 [deg radius, statistical plus systematic]
GRB_INTEN:       316 [cnts/sec]
DATA_SIGNIF:     15.70 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7144.37 SOD {01:59:04.37} UT
GRB_PHI:         250.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.85
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,1,1, 0,0,0, 0,0,
SUN_POSTN:        83.34d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:         92.61 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      120.71d {+08h 02m 50s}  +18.99d {+18d 59' 17"}
MOON_DIST:        61.16 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      272.87, 32.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.69,-27.43 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 137.52,5.18 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 15 Jun 10 01:59:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      70
TRIGGER_NUM:     298259946
GRB_RA:          174.930d {+11h 39m 43s} (J2000),
                 175.062d {+11h 40m 15s} (current),
                 174.300d {+11h 37m 12s} (1950)
GRB_DEC:         -21.800d {-21d 48' 00"} (J2000),
                 -21.858d {-21d 51' 28"} (current),
                 -21.523d {-21d 31' 21"} (1950)
GRB_ERROR:       3.33 [deg radius, statistical only]
DATA_SIGNIF:     25.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7144.37 SOD {01:59:04.37} UT
GRB_PHI:         246.00 [deg]
GRB_THETA:        68.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        83.34d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:         99.95 [deg]   Sun_angle= -6.1 [hr] (East of Sun)
MOON_POSTN:      120.71d {+08h 02m 51s}  +18.99d {+18d 59' 13"}
MOON_DIST:        67.02 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      281.64, 38.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.48,-21.92 [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:     Tue 15 Jun 10 01:59:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     298259946
GRB_RA:          173.950d {+11h 35m 48s} (J2000),
                 174.081d {+11h 36m 20s} (current),
                 173.322d {+11h 33m 17s} (1950)
GRB_DEC:         -22.770d {-22d 46' 11"} (J2000),
                 -22.828d {-22d 49' 39"} (current),
                 -22.493d {-22d 29' 35"} (1950)
GRB_ERROR:       2.28 [deg radius, statistical only]
DATA_SIGNIF:     24.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7144.37 SOD {01:59:04.37} UT
GRB_PHI:         246.00 [deg]
GRB_THETA:        67.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        83.34d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:         99.46 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:      120.71d {+08h 02m 51s}  +18.99d {+18d 59' 15"}
MOON_DIST:        66.81 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      281.00, 36.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.04,-23.19 [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:     Tue 15 Jun 10 01:59:29 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     298259946
GRB_RA:          165.450d {+11h 01m 48s} (J2000),
                 165.578d {+11h 02m 19s} (current),
                 164.841d {+10h 59m 22s} (1950)
GRB_DEC:         -23.650d {-23d 38' 59"} (J2000),
                 -23.706d {-23d 42' 22"} (current),
                 -23.381d {-23d 22' 50"} (1950)
GRB_ERROR:       7.62 [deg radius, statistical plus systematic]
GRB_INTEN:       227 [cnts/sec]
DATA_SIGNIF:     23.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7144.37 SOD {01:59:04.37} UT
GRB_PHI:         250.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.94
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 1,1,1, 0,0,0, 0,0,
SUN_POSTN:        83.34d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:         92.60 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      120.71d {+08h 02m 50s}  +18.99d {+18d 59' 16"}
MOON_DIST:        61.13 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      272.84, 32.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.67,-27.36 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 137.52,5.18 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:00:40 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.2048d {+11h 48m 49.15s} (J2000),
                 177.3377d {+11h 49m 21.05s} (current),
                 176.5696d {+11h 46m 16.70s} (1950)
GRB_DEC:         -19.4829d {-19d 28' 58.4"} (J2000),
                 -19.5410d {-19d 32' 27.6"} (current),
                 -19.2049d {-19d 12' 17.6"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.15e-09 [erg/cm2/sec]
GRB_SIGNIF:      12.36 [sigma]
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7206.39 SOD {02:00:06.39} UT,   62.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.22 261.51 243.75
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.72d {+08h 02m 53s}  +18.98d {+18d 59' 03"}
MOON_DIST:        67.57 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      185.49,-18.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.80 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:     Tue 15 Jun 10 02:00:54 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.2048d {+11h 48m 49.1s} (J2000),
                 177.3377d {+11h 49m 21.0s} (current),
                 176.5696d {+11h 46m 16.7s} (1950)
GRB_DEC:         -19.4829d {-19d 28' 58.4"} (J2000),
                 -19.5410d {-19d 32' 27.6"} (current),
                 -19.2049d {-19d 12' 17.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       153 [cnts]
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7206.39 SOD {02:00:06.39} UT,   62.4 [sec] since BAT Trigger Time
CENTROID_X:      294.36,  raw= 294  [pixels]
CENTROID_Y:      276.59,  raw= 277  [pixels]
ROLL:            291.05 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -50.46
GRB_POS_XRT_Z:   -18.71
IMAGE_URL:       sw00424733000msxps_rw.img
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.72d {+08h 02m 54s}  +18.98d {+18d 59' 01"}
MOON_DIST:        67.57 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      185.49,-18.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:00:50 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.2048d {+11h 48m 49.1s} (J2000),
                 177.3377d {+11h 49m 21.0s} (current),
                 176.5696d {+11h 46m 16.7s} (1950)
GRB_DEC:         -19.4829d {-19d 28' 58.4"} (J2000),
                 -19.5410d {-19d 32' 27.6"} (current),
                 -19.2049d {-19d 12' 17.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       153 [cnts]
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7206.39 SOD {02:00:06.39} UT,   62.4 [sec] since BAT Trigger Time
CENTROID_X:      294.36,  raw= 294  [pixels]
CENTROID_Y:      276.59,  raw= 277  [pixels]
ROLL:            291.05 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -50.46
GRB_POS_XRT_Z:   -18.71
IMAGE_URL:       sw00424733000msxps_rw.img
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.72d {+08h 02m 54s}  +18.98d {+18d 59' 02"}
MOON_DIST:        67.57 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      185.49,-18.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:03:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.204d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.497d {-19d 29' 49"} (J2000)
POINT_ROLL:      291.045d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7215.88 SOD {02:00:15.88} UT,   71.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.486
N_STARS:         34
X_OFFSET:        488 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0071.fits
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.75d {+08h 03m 00s}  +18.98d {+18d 58' 34"}
MOON_DIST:        67.55 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:03:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.204d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.497d {-19d 29' 49"} (J2000)
POINT_ROLL:      291.045d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7215.88 SOD {02:00:15.88} UT,   71.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.486
N_STARS:         34
X_OFFSET:        488 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0071.fits
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.75d {+08h 03m 00s}  +18.98d {+18d 58' 37"}
MOON_DIST:        67.55 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:05:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.204d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.497d {-19d 29' 49"} (J2000)
ROLL:            291.045d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7215.88 SOD {02:00:15.88} UT,   71.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     298260021
X_OFFSET:        890 [pixels]
Y_OFFSET:        953 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1050
Y_GRB_POS:       1113
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0077.fits
SUN_POSTN:        83.35d {+05h 33m 24s}  +23.30d {+23d 17' 48"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.77d {+08h 03m 06s}  +18.97d {+18d 58' 11"}
MOON_DIST:        67.53 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:02:37 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.207d {+11h 48m 50s} (J2000),
                 177.340d {+11h 49m 22s} (current),
                 176.572d {+11h 46m 17s} (1950)
GRB_DEC:         -19.496d {-19d 29' 45"} (J2000),
                 -19.554d {-19d 33' 14"} (current),
                 -19.218d {-19d 13' 04"} (1950)
GRB_DATE:        15362 TJD;   166 DOY;   10/06/15
GRB_TIME:        7143.99 SOD {01:59:03.99} UT
TRIGGER_INDEX:   124
GRB_PHI:         -25.88 [deg]
GRB_THETA:        18.01 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.87 [sigma]
IMAGE_SIGNIF:    10.47 [sigma]
LC_URL:          sw00424733000msb.lc
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.11 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.74d {+08h 02m 58s}  +18.98d {+18d 58' 43"}
MOON_DIST:        67.56 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      185.50,-18.93 [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 = 224.76,-19.27 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:03:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.204d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.497d {-19d 29' 49"} (J2000)
POINT_ROLL:      291.045d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7215.88 SOD {02:00:15.88} UT,   71.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.486
N_STARS:         34
X_OFFSET:        488 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0071.fits
SUN_POSTN:        83.35d {+05h 33m 23s}  +23.30d {+23d 17' 47"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.75d {+08h 03m 00s}  +18.98d {+18d 58' 37"}
MOON_DIST:        67.55 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:05:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.204d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.497d {-19d 29' 49"} (J2000)
ROLL:            291.045d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7215.88 SOD {02:00:15.88} UT,   71.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     298260021
X_OFFSET:        890 [pixels]
Y_OFFSET:        953 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1050
Y_GRB_POS:       1113
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0077.fits
SUN_POSTN:        83.35d {+05h 33m 24s}  +23.30d {+23d 17' 48"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.78d {+08h 03m 06s}  +18.97d {+18d 58' 09"}
MOON_DIST:        67.53 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:12:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7427.90 SOD {02:03:47.90} UT,   283.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.656
N_STARS:         22
X_OFFSET:        570 [pixels]
Y_OFFSET:        633 [pixels]
X_MAX:           1529 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00424733000msufc0283.fits
SUN_POSTN:        83.35d {+05h 33m 25s}  +23.30d {+23d 17' 48"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.85d {+08h 03m 23s}  +18.95d {+18d 56' 56"}
MOON_DIST:        67.46 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:12:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7427.90 SOD {02:03:47.90} UT,   283.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.656
N_STARS:         22
X_OFFSET:        570 [pixels]
Y_OFFSET:        633 [pixels]
X_MAX:           1529 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00424733000msufc0283.fits
SUN_POSTN:        83.35d {+05h 33m 25s}  +23.30d {+23d 17' 48"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.85d {+08h 03m 23s}  +18.95d {+18d 56' 56"}
MOON_DIST:        67.46 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:13:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7427.90 SOD {02:03:47.90} UT,   283.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.656
N_STARS:         22
X_OFFSET:        570 [pixels]
Y_OFFSET:        633 [pixels]
X_MAX:           1529 [pixels]
Y_MAX:           1592 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00424733000msufc0283.fits
SUN_POSTN:        83.35d {+05h 33m 25s}  +23.30d {+23d 17' 48"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.85d {+08h 03m 24s}  +18.95d {+18d 56' 52"}
MOON_DIST:        67.46 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:14:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
ROLL:            291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7427.90 SOD {02:03:47.90} UT,   283.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     298260233
X_OFFSET:        890 [pixels]
Y_OFFSET:        953 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1050
Y_GRB_POS:       1113
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0289.fits
SUN_POSTN:        83.35d {+05h 33m 25s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.86d {+08h 03m 26s}  +18.95d {+18d 56' 43"}
MOON_DIST:        67.45 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:14:04 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     424733,   Seg_Num: 0
GRB_RA:          177.2049d {+11h 48m 49.17s} (J2000),
                 177.3378d {+11h 49m 21.08s} (current),
                 176.5697d {+11h 46m 16.72s} (1950)
GRB_DEC:         -19.4806d {-19d 28' 50.1"} (J2000),
                 -19.5387d {-19d 32' 19.4"} (current),
                 -19.2026d {-19d 12' 09.3"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7291.00 SOD {02:01:31.00} UT,   147.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        83.35d {+05h 33m 25s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.09 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.86d {+08h 03m 26s}  +18.95d {+18d 56' 43"}
MOON_DIST:        67.44 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.24, 40.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      185.49,-18.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using 
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #10841
V. D'Elia (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), C. B. Markwardt (CRESST/GSFC/UMD), T. Sakamoto (NASA/UMBC), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), G. Stratta (ASDC), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 01:59:03 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100615A (trigger=424733). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 177.207, -19.496 which is
```
   RA(J2000)  =  11h 48m 50s
   Dec(J2000) = -19d 29' 45"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows 3 strong peaks with a duration of about 60 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 02:00:06.4 UT, 62.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 177.20376, -19.48169 which is equivalent to:
```
   RA(J2000)  = 11h 48m 48.90s
   Dec(J2000) = -19d 28' 54.1"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 52 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (3.28e+20 cm^-2, Kalberla et al. 2005), with an excess column of 1.3 (+0.47/-0.39) x 10^22 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 6.15e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 71 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). 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:     Tue 15 Jun 10 02:14:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
ROLL:            291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  7427.90 SOD {02:03:47.90} UT,   283.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     298260233
X_OFFSET:        890 [pixels]
Y_OFFSET:        953 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1050
Y_GRB_POS:       1113
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0289.fits
SUN_POSTN:        83.36d {+05h 33m 25s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.86d {+08h 03m 27s}  +18.94d {+18d 56' 41"}
MOON_DIST:        67.45 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:19:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  8007.91 SOD {02:13:27.91} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.344
N_STARS:         83
X_OFFSET:        330 [pixels]
Y_OFFSET:        393 [pixels]
X_MAX:           1769 [pixels]
Y_MAX:           1832 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0863.fits
SUN_POSTN:        83.36d {+05h 33m 26s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.92d {+08h 03m 41s}  +18.93d {+18d 55' 41"}
MOON_DIST:        67.39 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:19:57 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  8007.91 SOD {02:13:27.91} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.344
N_STARS:         83
X_OFFSET:        330 [pixels]
Y_OFFSET:        393 [pixels]
X_MAX:           1769 [pixels]
Y_MAX:           1832 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0863.fits
SUN_POSTN:        83.36d {+05h 33m 26s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.92d {+08h 03m 41s}  +18.93d {+18d 55' 41"}
MOON_DIST:        67.39 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:20:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
POINT_ROLL:      291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  8007.91 SOD {02:13:27.91} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.344
N_STARS:         83
X_OFFSET:        330 [pixels]
Y_OFFSET:        393 [pixels]
X_MAX:           1769 [pixels]
Y_MAX:           1832 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00424733000msufc0863.fits
SUN_POSTN:        83.36d {+05h 33m 26s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.92d {+08h 03m 41s}  +18.93d {+18d 55' 38"}
MOON_DIST:        67.39 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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:     Tue 15 Jun 10 02:21:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
ROLL:            291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  8007.91 SOD {02:13:27.91} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     298260813
X_OFFSET:        889 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1049
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0869.fits
SUN_POSTN:        83.36d {+05h 33m 26s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.09 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.94d {+08h 03m 45s}  +18.92d {+18d 55' 24"}
MOON_DIST:        67.38 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 15 Jun 10 02:21:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     424733,   Seg_Num: 0
POINT_RA:        177.205d {+11h 48m 49s} (J2000)
POINT_DEC:       -19.500d {-19d 29' 59"} (J2000)
ROLL:            291.046d
IMG_START_DATE:  15362 TJD;   166 DOY;   10/06/15
IMG_START_TIME:  8007.91 SOD {02:13:27.91} UT,   863.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     298260813
X_OFFSET:        889 [pixels]
Y_OFFSET:        952 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1049
Y_GRB_POS:       1112
BINNING_INDEX:   1
IM_URL:          sw00424733000msuni0869.fits
SUN_POSTN:        83.36d {+05h 33m 26s}  +23.30d {+23d 17' 49"}
SUN_DIST:        101.10 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      120.93d {+08h 03m 44s}  +18.92d {+18d 55' 26"}
MOON_DIST:        67.38 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      283.25, 40.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      185.50,-18.94 [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 Circular #10842
V. Dhillon (U. Sheffield), R. Mignani (MSSL), S. Schulze (U. Iceland), A. J. Levan (U. Warwick), N. R. Tanvir (U. Leicester), A. de Cia (U. Iceland) report on behalf of the ULTRACAM collaboration:
We observed the field of GRB 100615A (D'Elia et al., GCN 10841) with ULTRACAM (Dhillon et al., MNRAS, 2007, 378, 825) mounted on the 3.5-m NTT telescope on La Silla, beginning approximately 17 mins post-burst.
Stacking the images from 02:16:27 to 02:39:29 UT did not reveal any new source down to 24 mag (3 sigma) in the i' band.
The deep limiting magnitude at early times, coupled with bright X-ray afterglow with moderate hydrogen column density (D'Elia et al. GCN 10841) is suggestive of a highly extinguished burst.
GCN Circular #10843
A. N. Morgan C. R. Klein, and J. S. Bloom (UC Berkeley) report:
We observed the field of GRB 100615A (D'Elia et al., GCN 10841) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2010-06-15 03h21m51 UT, ~1.4 hours after the Swift Trigger, under high airmass (~2), and continued until the source set beyond telescope limits. In mosaics (effective exposure time of 0.56 hours) taken simultaneously in the J, H, and Ks filters, we do not detect any source within the XRT error circle.
The preliminary photometry yields:
```
post burst
t_mid (hr) exp.(hr) filt  U. Limit (3 sig)
1.94      0.56     J     > 18.8
1.94      0.56     H     > 17.9
1.94      0.56     Ks    > 16.6
```
All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values.
GCN Circular #10844
A. Nicuesa, S. Klose (both TLS Tautenburg), and J. Greiner (MPE Garching), report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted at the 2.2m ESO/MPI telescope on La Silla, started follow-up observations of GRB 100615A (D'Elia et al. 2010, GCN 10841) on June 15 at 2:05 UT (about 6 min after the trigger).
Within the 3.7 arcsec XRT error circle we do not find any afterglow candidate. Preliminary measured upper limits based on an 8 min observing block starting at 2:20 UT are (in the AB system, 3 sigma):
```
g' > 24.2,
r' > 23.9,
i' > 22.9,
z' > 22.5,
J  > 21.4,
H  > 20.7,
K  > 20.3,
```
using GROND zeropoints and the 2MASS catalog. This is in agreement with the report by Dhillon et al. about the non-detection in the i' band (GCN 10842).
GCN Circular #10847
R. Margutti, B. Sbarufatti (INAF-OAB) and V. D'Elia (ASDC) report on behalf of the Swift-XRT team:
We have analysed 1.1 ks of XRT data for GRB 100615A (D'Elia et al. GCN Circ. 10841), from 68 s to 1.2 ks after the BAT trigger. The data comprise 73 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The light curve can be modelled with an initial power-law decay with an index of alpha=4.17 (+0.23, -0.22), followed by a break at T+191 s to an alpha of -0.03 (+0.23, -0.25).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.21 (+0.16, -0.15). The best-fitting absorption column is 8.8 (+1.1, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 3.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.6 (+0.4, -0.3) and a best-fitting absorption column of 1.18 (+0.29, -0.25) x 10^22 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.9 x 10^-11 (1.9 x 10^-10) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of -0.03, the count rate at T+24 hours will be 1.4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.8 x 10^-11 (2.6 x 10^-10) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00424733.
This circular is an official product of the Swift-XRT team.
GCN Circular #10848
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1489 s of XRT Photon Counting mode data and 2 UVOT images for GRB 100615A, 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 = 177.20522, -19.48118 which is equivalent to:
```
RA (J2000): 11h 48m 49.25s
Dec (J2000): -19d 28' 52.2"
```
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, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #10850
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100615A (trigger #424733) (D'Elia, et al., GCN Circ. 10841). The BAT ground-calculated position is RA, Dec = 177.208, -19.483 deg, which is
```
   RA(J2000)  =  11h 48m 49.9s 
   Dec(J2000) = -19d 29' 00.0" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%.
The mask-weighted light curve shows 3 slightly overlapping FRED peaks with the first starting at ~T-0.2 sec and peaking at ~T+2 sec. The second peaks at ~T+10 sec. The third peaks at ~T+30 sec and ends at ~T+~120 sec. T90 (15-350 keV) is 39 +- 2 sec (estimated error including systematics).
The time-averaged spectrum from T-0.0 to T+47.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.04. The fluence in the 15-150 keV band is 5.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.26 sec in the 15-150 keV band is 5.4 +- 0.2 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/424733/BA/
GCN Circular #10851
S. Foley (MPE) and M. Briggs (UAH) report on behalf of the Fermi GBM Team:
"At 01:59:04.37 UT on 15 June 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100615A (trigger 298259946 / 100615083) which was also detected by the SWIFT-BAT (D'Elia et al. 2010, GCN 10841). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 64 degrees.
The GBM light curve consists of 3 main pulses with a duration (T90) of about 37.7 +/- 0.8 s (10-1000 keV). The time-averaged spectrum from T0+0.003 s to T0+39.553 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -1.34 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 106.20 (+7.53/-6.07) keV (CSTAT 989.31 for 606 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (8.64 +/- 0.17)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+9.7 s in the 8-1000 keV band is 8.3 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well (CSTAT 976.41 for 605 d.o.f.) with Epeak = 85.73 (+7.82/-9.33) keV, alpha = -1.24 (+0.08/-0.06) and beta = -2.27 (+0.11/-0.12).
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #10856
S. T. Holland (CRESST/GSFC/USRA) and V. D'Elia (ASDC) report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 100615A starting 53 s after the BAT trigger (D'Elia, et al., 2010, GCN Circ. 10841). Settled observations started at 72 s. We do not find any new source, relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT afterglow (Goad, et al. 2010, GCN Circ. 10848). Preliminary 3-sigma upper limits for detecting a source in the finding charts, and in the co-added images, using a 2.5 arcsecond radius circular aperture, are
```
Filter    T_start   T_stop   Exp(s)      Mag
--------------------------------------------
white (fc)     72      222      147    >21.5
              864     1014      147    >21.5
u (fc)        284      534      246    >20.7


v             613     7037      510    >20.6
b             539     6422      490    >21.1
u             284     6216      539    >21.1
uvw1          663     7436      499    >21.1
uvm2          813     7242      413    >20.7
uvw2          589     6832      471    >21.1
white          72     6627      785    >22.2
--------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.05 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #10858
S. T. Holland (CRESST/GSFC/USRA) and V. D'Elia (ASDC) report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 100615A starting 53 s after the BAT trigger (D'Elia, et al., 2010, GCN Circ. 10841). Settled observations started at 72 s. We do not find any new source, relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT afterglow (Goad, et al. 2010, GCN Circ. 10848). Preliminary 3-sigma upper limits for detecting a source in the finding charts, and in the co-added images, using a 2.5 arcsecond radius circular aperture, are
```
Filter    T_start   T_stop   Exp(s)      Mag
--------------------------------------------
white (fc)     72      222      147    >21.5
             864     1014      147    >21.5
u (fc)        284      534      246    >20.7


v             613     7037      510    >20.6
b             539     6422      490    >21.1
u             284     6216      539    >21.1
uvw1          663     7436      499    >21.1
uvm2          813     7242      413    >20.7
uvw2          589     6832      471    >21.1
white          72     6627      785    >22.2
--------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.05 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT photometry system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #10861
S. B. Cenko, D. A. Perley (UC Berkeley), N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), J. S. Bloom, B. E. Cobb (UC Berkeley), K. Wiersema (U. Leicester) report on behalf of a larger collaboration:
We have imaged the field of GRB100615A (D'Elia et al., GCN 10841) with the Near InfraRed Imager on the 8-m Gemini North telescope. Observations were obtained in the J and K filters beginning at 7:36 UT on 15 June 2010 (~ 5.5 hours after the trigger).
We find no sources inside the revised XRT error circle (Goad et al., GCN 10848) to limiting magnitudes of J > 22.1, K > 20.9 (Vega, calibrated with respect to 2MASS). Combined with additional limits from other facilities (Dhillon et al., GCN 10842; Morgan et al., GCN 10843; Nicuesa et al., GCN 10844; Holland and D'Elia, GCN 10856), and the large excess X-ray column derived from XRT observations (Margutti et al., GCN 10847), we conclude that GRB100615A is likely a highly extinguished event.
GCN Report 285.1
GCN_Report 285.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_285_1.pdf by V. D Elia at ASDC titled: "Final Swift Observations of GRB 100615A"
GCN Circular #10915
N. R. Butler, D. A. Perley, S. B. Cenko, J. S. Bloom (UC Berkeley), A. J. Levan (U. Warwick), and N. R. Tanvir (U. Leicester) report on behalf of a larger collaboration:
Beginning 2010/06/15 01:59 UT (6.1 days post burst) and for a period of 14.8 ksec (livetime), Chandra targeted the field of the optically dark GRB 100615A (D'Elia et al. 2010, GCN 10841; Foley et al. 2010, GCN 10851) with ACIS-S under Director's Discretionary Time. The X-ray afterglow is well detected (210 cts, 0.5-8 keV) at a position consistent with that of the Swift GRB and afterglow (GCN 10841; Goad et al. 2010, GCN 10848). We find:
RA, Dec (J2000) = 11:48:49.34, -19:28:52.0 +/- 0.6"
The counts spectrum can be modelled by an absorbed powerlaw, with photon index Gamma = 2.0+/-0.5 (Cash/nu = 11.2/17). The unabsorbed flux is 3.2^{+1.4}_{-0.7} x 10^{-13} erg cm^(-2) s^(-1) (0.5-8 keV).
There is 6-sigma significant evidence (Delta Cash = 32.4 for 1 additional degree of freedom) for a large N_H column 1.0^{+0.4}_{-0.3} x 10^22 cm^(-2) (z=0) in excess of the Galactic value (3.3 x10^20 cm^(-2); Kalberla et al. 2005). This is in agreement with the XRT analyses (Margutti et al. 2010, GCN 10847) and further indicates that GRB 100615A is likely a highly extinguished event (see also, Cenko et al. 2010, GCN 10861).
All uncertainties above are 90% confidence.
We thank Harvey Tananbaum and the CXO team for permitting and rapidly conducting this observation. This message can be cited.
GCN Circular #10928
D. A. Perley, J. S. Bloom, S. B. Cenko, and N. R. Butler (UC Berkeley) report:
We again observed the field of GRB 100615A (D'Elia et al. 2010, GCN 10841) using NIRI on Gemini-North between 06:06 and 07:03 on 2010-06-24 UT, at moderately high airmass. We acquired 45 images of 60 seconds each in the K' filter, a significantly deeper integration than our previous observation (Cenko et al., GCN 10861).
A faint object is detected slightly west of the latest online UVOT-enhanced XRT error circle, with an aperture magnitude of K' = 21.3 +/- 0.3 mag. However, the location of this object is not consistent with the improved X-ray localization provided by the Chandra observations (Butler et al., GCN 10915).
A very faint possible source is visible at the Chandra location, but it is not statistically significant (1.5-sigma). The 3-sigma limit of the image is K' > 22.2 mag; forced photometry gives K' = 23.0 +/- 0.8 mag at this location.
An image of the field is posted to: http://lyra.berkeley.edu/~dperley/100615a/100615a_niri.png
1108.1054 from 5 Aug 11
V. D'Elia et al.: Extremely dark GRBs: the case of GRB 100614A and GRB 100615A
Dark gamma-ray bursts (GRBs) are sources with a low optical-to-X-ray flux ratio. Proposed explanations for this darkness are: i) the GRB is at high redshift ii) dust in the GRB host galaxy absorbs the optical/NIR flux iii) GRBs have an intrinsically faint afterglow emission. Within this framework, GRB 100614A and GRB 100615A are extreme. In fact, they are bright in the X-rays, but no optical/NIR afterglow has been detected for either source, despite several follow-up campaigns began early after the triggers. We build optical-to-X-ray spectral energy distributions (SEDs) at the times at which the reddest upper limits are available, and we model our SEDs with the extinction curves of the Milky Way (MW), Small Magellanic Cloud (SMC), and the attenuation curve obtained for a sample of starburst galaxies. We find that to explain the deepest NIR upper limits assuming either a MW or SMC extinction law, a visual extinction of AV > 50 is required, which is extremely unlikely. Since both GRBs are bright in X-rays, explanation iii) also cannot explain their dark classification, unless optical radiation and X-rays are not part of the same synchrotron spectrum. An alternative, or complementary explanation of the previous possibility, involves greyer extinction laws. A starburst attenuation curve gives AV>10, which is less extreme, despite still very high. Assuming high redshift in addition to extinction, implies an AV>10 at z=2 and AV>4-5 at z=5, regardless of the adopted extinction recipe. A different, exotic possibility would be an extremely high redshift origin (z>17 given the missing K detections). Population III stars are expected to emerge at z ~ 20 and can produce GRBs with energies well above those inferred for our GRBs at these redshifts. Mid- and far-IR observations of these extreme class of GRBs can help us to differentiate between the proposed scenarios.
1108.1077 from 5 Aug 11
V. D'Elia et al.: GRB 100614A and GRB 100615A: two extremely dark GRBs
Dark gamma-ray bursts (GRBs) are sources with a low optical-to-X-ray flux ratio. Proposed explanations for this darkness are: i) the GRB is at high redshift ii) dust in the GRB host galaxy absorbs the optical/NIR flux iii) GRBs have an intrinsically faint afterglow emission. Within this framework, GRB 100614A and GRB 100615A are extreme. In fact, they are bright in the X-rays, but no optical/NIR afterglow has been detected for either source, despite several follow-up campaigns began early after the triggers. We build optical-to-X-ray spectral energy distributions (SEDs) at the times at which the reddest upper limits are available, and we model our SEDs with the extinction curves of the Milky Way (MW), Small Magellanic Cloud (SMC), and the attenuation curve obtained for a sample of starburst galaxies. We find that to explain the deepest NIR upper limits assuming either a MW or SMC extinction law, a visual extinction of AV > 50 is required, which is extremely unlikely. Since both GRBs are bright in X-rays, explanation iii) also cannot explain their dark classification, unless optical radiation and X-rays are not part of the same synchrotron spectrum. An alternative, or complementary explanation of the previous possibility, involves greyer extinction laws. A starburst attenuation curve gives AV>10, which is less extreme, despite still very high. Assuming high redshift in addition to extinction, implies an AV>10 at z=2 and AV>4-5 at z=5, regardless of the adopted extinction recipe. A different, exotic possibility would be an extremely high redshift origin (z>17 given the missing K detections). Population III stars are expected to emerge at z ~ 20 and can produce GRBs with energies well above those inferred for our GRBs at these redshifts. Mid- and far-IR observations of these extreme class of GRBs can help us to differentiate between the proposed scenarios.
GCN Circular #14264
T. Kruehler, D. Malesani, D. Xu, J. P. U. Fynbo (DARK/NBI), A. J. Levan (U. Warwick), N. R. Tanvir (U. Leicester), V. D'Elia (ASDC, INAF) and D. Perley (Caltech) report on behalf of the X-shooter GTO GRB collaboration:
The field of GRB 100615A (Swift trigger 424733, D'Elia et al., GCN 10841) was observed with the Hubble Space Telescope and WFC3 (filters F606W and F160W) under proposal ID 11840 (PI: A. J. Levan). Observations were carried out on 2010 Dec 16 (154 days after the GRB), for a total exposure time of 1128 s and 1208 s, respectively. In the HST images, we detect a single, resolved object (F160W = 24.1 AB mag) consistent with the Chandra X-ray position (Butler et al., GCN 10915), which we consider to be the GRB host galaxy.
Its coordinates are (J2000):
```
RA = 11:48:49.34
Dec = -19:28:51.8
```
A spectrum of this source was taken on 2013 Mar 05 with the ESO VLT equipped with the X-shooter spectrograph, covering the wavelength range 3000-20500 AA. The seeing was 0.8". In the VIS and NIR arm, we detect several emission lines, interpreted as the doublet of [O II](3726, 3729), [Ne III](3869), [O III](4959), [O III](5007) and Halpha at a common redshift of z = 1.398.
At this redshift, the afterglow data imply a very high host exinction along the GRB sight-line (A_V > 10-15, see D'Elia & Stratta 2011, A&A, 532, A48, their Figure 4). The intrinsic soft X-ray absorption column measured from Swift/XRT data (Margutti et al., GCN 10847) at z = 1.398 is N_{H,X} = 1.07 (+0.13, -0.12) x 10^23 cm^-2. This is similarly at the high end of measured column densities, even among dark bursts (e.g., Kruehler et al., 2012, ApJ, 758, 46, their Figure 5). In contrast, the host of GRB 100615A is rather blue (F606W - F160W \sim 1 AB mag) and does not show obvious signs of heavy dust content.
We acknowledge excellent support from the observing staff at Paranal, in particular Giacomo Beccari and Emanuela Pompei.

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