Gamma-ray Burst 150309A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:00:15 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     447634793
GRB_RA:          273.533d {+18h 14m 08s} (J2000),
                 273.425d {+18h 13m 42s} (current),
                 273.889d {+18h 15m 33s} (1950)
GRB_DEC:         +74.433d {+74d 25' 60"} (J2000),
                 +74.438d {+74d 26' 18"} (current),
                 +74.415d {+74d 24' 55"} (1950)
GRB_ERROR:       14.65 [deg radius, statistical plus systematic]
GRB_INTEN:       94 [cnts/sec]
DATA_SIGNIF:     9.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82790.66 SOD {22:59:50.66} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.49
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      64%  Distant Particles
2nd_MOST_LIKELY:  32%  GRB
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       349.93d {+23h 19m 44s}   -4.33d {-04d 19' 56"}
SUN_DIST:         90.59 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:      213.36d {+14h 13m 26s}  -11.01d {-11d 00' 48"}
MOON_DIST:        93.02 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      105.39, 28.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       83.14, 82.04 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150309958/quicklook/glg_lc_medres34_bn150309958.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.35,-18.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:00:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     447634793
GRB_RA:          272.967d {+18h 11m 52s} (J2000),
                 272.251d {+18h 09m 00s} (current),
                 275.314d {+18h 21m 15s} (1950)
GRB_DEC:         +84.700d {+84d 42' 00"} (J2000),
                 +84.704d {+84d 42' 14"} (current),
                 +84.680d {+84d 40' 48"} (1950)
GRB_ERROR:       8.27 [deg radius, statistical plus systematic]
GRB_INTEN:       299 [cnts/sec]
DATA_SIGNIF:     20.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82790.66 SOD {22:59:50.66} UT
GRB_PHI:          35.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.94
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      64%  Distant Particles
2nd_MOST_LIKELY:  35%  GRB
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       349.93d {+23h 19m 44s}   -4.33d {-04d 19' 56"}
SUN_DIST:         93.19 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      213.36d {+14h 13m 26s}  -11.01d {-11d 00' 49"}
MOON_DIST:        98.25 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      117.02, 27.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       89.12, 71.85 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150309958/quicklook/glg_lc_medres34_bn150309958.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.35,-18.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:00:33 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     447634793
GRB_RA:          178.300d {+11h 53m 12s} (J2000),
                 178.519d {+11h 54m 04s} (current),
                 177.554d {+11h 50m 13s} (1950)
GRB_DEC:         +84.450d {+84d 27' 00"} (J2000),
                 +84.365d {+84d 21' 56"} (current),
                 +84.728d {+84d 43' 42"} (1950)
GRB_ERROR:       4.93 [deg radius, statistical plus systematic]
GRB_INTEN:       569 [cnts/sec]
DATA_SIGNIF:     52.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82790.66 SOD {22:59:50.66} UT
GRB_PHI:          43.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.78
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      74%  Distant Particles
2nd_MOST_LIKELY:  25%  GRB
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       349.93d {+23h 19m 44s}   -4.33d {-04d 19' 55"}
SUN_DIST:         99.90 [deg]   Sun_angle= 11.4 [hr] (West of Sun)
MOON_POSTN:      213.36d {+14h 13m 26s}  -11.01d {-11d 00' 50"}
MOON_DIST:        96.37 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      124.58, 32.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      103.63, 65.79 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150309958/quicklook/glg_lc_medres34_bn150309958.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.35,-18.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:00:39 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      74
TRIGGER_NUM:     447634793
GRB_RA:          181.100d {+12h 04m 24s} (J2000),
                 181.276d {+12h 05m 06s} (current),
                 180.502d {+12h 02m 00s} (1950)
GRB_DEC:         +84.583d {+84d 34' 60"} (J2000),
                 +84.499d {+84d 29' 56"} (current),
                 +84.862d {+84d 51' 42"} (1950)
GRB_ERROR:       5.08 [deg radius, statistical plus systematic]
GRB_INTEN:       858 [cnts/sec]
DATA_SIGNIF:     77.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82790.66 SOD {22:59:50.66} UT
GRB_PHI:          43.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.76
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      73%  Distant Particles
2nd_MOST_LIKELY:  25%  GRB
DETECTORS:       1,0,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       349.93d {+23h 19m 44s}   -4.33d {-04d 19' 55"}
SUN_DIST:         99.72 [deg]   Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN:      213.36d {+14h 13m 27s}  -11.01d {-11d 00' 51"}
MOON_DIST:        96.34 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      124.24, 32.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      103.46, 66.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150309958/quicklook/glg_lc_medres34_bn150309958.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.35,-18.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:04:25 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          276.987d {+18h 27m 57s} (J2000),
                 275.834d {+18h 23m 20s} (current),
                 280.729d {+18h 42m 55s} (1950)
GRB_DEC:         +86.430d {+86d 25' 46"} (J2000),
                 +86.439d {+86d 26' 20"} (current),
                 +86.387d {+86d 23' 11"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2273 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82986.71 SOD {23:03:06.71} UT
GRB_PHI:          68.03 [deg]
GRB_THETA:        25.94 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.00 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +2  +0  +0  +5  +0 
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 52"}
SUN_DIST:         93.35 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.39d {+14h 13m 34s}  -11.02d {-11d 01' 20"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       88.72, 70.10 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 129.85,19.03 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 09 Mar 15 23:01:02 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6913,   Sub_Num: 0
GRB_INTEN:      9.14 [sigma]   
GRB_TIME:       82791.95 SOD {22:59:51.95} UT
GRB_DATE:       17090 TJD;    68 DOY;   15/03/09
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.8000 and Time_Error=0.4000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=447634793).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2015-03/2015-03-09T22-59-51.7770-09399-39824-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:05:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          277.1054d {+18h 28m 25.29s} (J2000),
                 275.9517d {+18h 23m 48.40s} (current),
                 280.8460d {+18h 43m 23.05s} (1950)
GRB_DEC:         +86.4304d {+86d 25' 49.4"} (J2000),
                 +86.4400d {+86d 26' 24.0"} (current),
                 +86.3869d {+86d 23' 12.6"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.73e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.43 [sigma]
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83118.21 SOD {23:05:18.21} UT,   131.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.22 261.52 243.57
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 50"}
SUN_DIST:         93.34 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.40d {+14h 13m 37s}  -11.03d {-11d 01' 31"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       88.70, 70.10 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.44 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:06:03 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          277.1054d {+18h 28m 25.2s} (J2000),
                 275.9517d {+18h 23m 48.4s} (current),
                 280.8460d {+18h 43m 23.0s} (1950)
GRB_DEC:         +86.4304d {+86d 25' 49.4"} (J2000),
                 +86.4400d {+86d 26' 24.0"} (current),
                 +86.3869d {+86d 23' 12.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       89 [cnts]
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83118.21 SOD {23:05:18.21} UT,   131.5 [sec] since BAT Trigger Time
CENTROID_X:      326.88,  raw= 327  [pixels]
CENTROID_Y:      299.52,  raw= 300  [pixels]
ROLL:            107.61 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   4.06
GRB_POS_XRT_Z:   50.88
IMAGE_URL:       sw00634200000msxps_rw.img
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 50"}
SUN_DIST:         93.34 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.41d {+14h 13m 37s}  -11.03d {-11d 01' 32"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       88.70, 70.10 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:06:12 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          277.1054d {+18h 28m 25.2s} (J2000),
                 275.9517d {+18h 23m 48.4s} (current),
                 280.8460d {+18h 43m 23.0s} (1950)
GRB_DEC:         +86.4304d {+86d 25' 49.4"} (J2000),
                 +86.4400d {+86d 26' 24.0"} (current),
                 +86.3869d {+86d 23' 12.6"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       89 [cnts]
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83118.21 SOD {23:05:18.21} UT,   131.5 [sec] since BAT Trigger Time
CENTROID_X:      326.88,  raw= 327  [pixels]
CENTROID_Y:      299.52,  raw= 300  [pixels]
ROLL:            107.61 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   4.06
GRB_POS_XRT_Z:   50.88
IMAGE_URL:       sw00634200000msxps_rw.img
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 50"}
SUN_DIST:         93.34 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.41d {+14h 13m 38s}  -11.03d {-11d 01' 33"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       88.70, 70.10 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:07:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          276.987d {+18h 27m 57s} (J2000),
                 275.834d {+18h 23m 20s} (current),
                 280.729d {+18h 42m 55s} (1950)
GRB_DEC:         +86.430d {+86d 25' 46"} (J2000),
                 +86.439d {+86d 26' 20"} (current),
                 +86.387d {+86d 23' 11"} (1950)
GRB_DATE:        17090 TJD;    68 DOY;   15/03/09
GRB_TIME:        82986.71 SOD {23:03:06.71} UT
TRIGGER_INDEX:   20000
GRB_PHI:          68.03 [deg]
GRB_THETA:        25.94 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.00 [sigma]
LC_URL:          sw00634200000msb.lc
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 49"}
SUN_DIST:         93.35 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.42d {+14h 13m 40s}  -11.03d {-11d 01' 41"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       88.72, 70.10 [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 an image 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 = 129.85,19.03 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:09:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.307d {+18h 29m 14s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 29"} (J2000)
POINT_ROLL:      107.600d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83127.24 SOD {23:05:27.24} UT,   140.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.749
N_STARS:         87
X_OFFSET:        344 [pixels]
Y_OFFSET:        648 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1607 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00634200000msufc0140.fits
SUN_POSTN:       349.94d {+23h 19m 45s}   -4.33d {-04d 19' 47"}
SUN_DIST:         93.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.43d {+14h 13m 43s}  -11.03d {-11d 01' 55"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:09:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.307d {+18h 29m 14s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 29"} (J2000)
POINT_ROLL:      107.600d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83127.24 SOD {23:05:27.24} UT,   140.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.749
N_STARS:         87
X_OFFSET:        344 [pixels]
Y_OFFSET:        648 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1607 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00634200000msufc0140.fits
SUN_POSTN:       349.94d {+23h 19m 46s}   -4.33d {-04d 19' 47"}
SUN_DIST:         93.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.43d {+14h 13m 44s}  -11.03d {-11d 01' 58"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:11:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.307d {+18h 29m 14s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 29"} (J2000)
ROLL:            107.600d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83127.24 SOD {23:05:27.24} UT,   140.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     447635140
X_OFFSET:        694 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0154.fits
SUN_POSTN:       349.94d {+23h 19m 46s}   -4.33d {-04d 19' 45"}
SUN_DIST:         93.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.45d {+14h 13m 47s}  -11.04d {-11d 02' 10"}
MOON_DIST:        99.39 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:11:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.307d {+18h 29m 14s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 29"} (J2000)
ROLL:            107.600d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83127.24 SOD {23:05:27.24} UT,   140.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     447635140
X_OFFSET:        694 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0154.fits
SUN_POSTN:       349.94d {+23h 19m 46s}   -4.33d {-04d 19' 45"}
SUN_DIST:         93.33 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.45d {+14h 13m 48s}  -11.04d {-11d 02' 13"}
MOON_DIST:        99.39 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.42 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:16:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.349d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 31"} (J2000)
POINT_ROLL:      107.641d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83285.71 SOD {23:08:05.71} UT,   299.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.045
N_STARS:         88
X_OFFSET:        374 [pixels]
Y_OFFSET:        610 [pixels]
X_MAX:           1333 [pixels]
Y_MAX:           1569 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00634200000msufc0299.fits
SUN_POSTN:       349.94d {+23h 19m 47s}   -4.33d {-04d 19' 40"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.49d {+14h 13m 58s}  -11.05d {-11d 02' 51"}
MOON_DIST:        99.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:16:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.349d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 31"} (J2000)
POINT_ROLL:      107.641d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83285.71 SOD {23:08:05.71} UT,   299.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.045
N_STARS:         88
X_OFFSET:        374 [pixels]
Y_OFFSET:        610 [pixels]
X_MAX:           1333 [pixels]
Y_MAX:           1569 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00634200000msufc0299.fits
SUN_POSTN:       349.94d {+23h 19m 47s}   -4.33d {-04d 19' 40"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.49d {+14h 13m 59s}  -11.05d {-11d 02' 54"}
MOON_DIST:        99.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:17:51 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.349d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 31"} (J2000)
ROLL:            107.641d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83285.71 SOD {23:08:05.71} UT,   299.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     447635299
X_OFFSET:        694 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0313.fits
SUN_POSTN:       349.95d {+23h 19m 47s}   -4.33d {-04d 19' 38"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.50d {+14h 14m 01s}  -11.05d {-11d 03' 02"}
MOON_DIST:        99.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:18:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.349d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 31"} (J2000)
ROLL:            107.641d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83285.71 SOD {23:08:05.71} UT,   299.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     447635299
X_OFFSET:        694 [pixels]
Y_OFFSET:        930 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       854
Y_GRB_POS:       1090
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0313.fits
SUN_POSTN:       349.95d {+23h 19m 47s}   -4.33d {-04d 19' 38"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.51d {+14h 14m 01s}  -11.05d {-11d 03' 04"}
MOON_DIST:        99.40 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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 Circular #17553
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 23:03:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150309A (trigger=634200). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 276.987, +86.430, which is
```
   RA(J2000)  =  18h 27m 57s
   Dec(J2000) = +86d 25' 46"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a peak around T+30 sec with a duration of about 60 sec. The peak count rate was ~200 counts/sec (15-350 keV), at ~45 sec after the trigger.
The XRT began observing the field at 23:05:18.2 UT, 131.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 277.08842, 86.42988 which is equivalent to:
```
   RA(J2000)  = 18h 28m 21.22s
   Dec(J2000) = +86d 25' 47.6"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 22 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (9.05 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.4 (+3.89/-3.10) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 2.73e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 140 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 0.14.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). 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:     Mon 09 Mar 15 23:22:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.351d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 32"} (J2000)
POINT_ROLL:      107.642d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83864.98 SOD {23:17:44.98} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.582
N_STARS:         190
X_OFFSET:        134 [pixels]
Y_OFFSET:        370 [pixels]
X_MAX:           1573 [pixels]
Y_MAX:           1809 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00634200000msufc0878.fits
SUN_POSTN:       349.95d {+23h 19m 48s}   -4.33d {-04d 19' 34"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.54d {+14h 14m 10s}  -11.06d {-11d 03' 36"}
MOON_DIST:        99.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:22:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.351d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 32"} (J2000)
POINT_ROLL:      107.642d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83864.98 SOD {23:17:44.98} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.582
N_STARS:         190
X_OFFSET:        134 [pixels]
Y_OFFSET:        370 [pixels]
X_MAX:           1573 [pixels]
Y_MAX:           1809 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00634200000msufc0878.fits
SUN_POSTN:       349.95d {+23h 19m 48s}   -4.33d {-04d 19' 34"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.54d {+14h 14m 10s}  -11.06d {-11d 03' 37"}
MOON_DIST:        99.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:24:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.351d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 32"} (J2000)
ROLL:            107.642d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83864.98 SOD {23:17:44.98} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     447635878
X_OFFSET:        693 [pixels]
Y_OFFSET:        929 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       853
Y_GRB_POS:       1089
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0892.fits
SUN_POSTN:       349.95d {+23h 19m 48s}   -4.33d {-04d 19' 32"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.56d {+14h 14m 14s}  -11.06d {-11d 03' 53"}
MOON_DIST:        99.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:     Mon 09 Mar 15 23:24:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     634200,   Seg_Num: 0
POINT_RA:        277.351d {+18h 29m 24s} (J2000)
POINT_DEC:       +86.425d {+86d 25' 32"} (J2000)
ROLL:            107.642d
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83864.98 SOD {23:17:44.98} UT,   878.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     447635878
X_OFFSET:        693 [pixels]
Y_OFFSET:        929 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       853
Y_GRB_POS:       1089
BINNING_INDEX:   1
IM_URL:          sw00634200000msuni0892.fits
SUN_POSTN:       349.95d {+23h 19m 48s}   -4.33d {-04d 19' 32"}
SUN_DIST:         93.32 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.56d {+14h 14m 15s}  -11.07d {-11d 03' 55"}
MOON_DIST:        99.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.92, 27.41 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       88.66, 70.10 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Mar 15 23:33:33 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     634200,   Seg_Num: 0
GRB_RA:          277.0921d {+18h 28m 22.10s} (J2000),
                 275.9387d {+18h 23m 45.28s} (current),
                 280.8320d {+18h 43m 19.67s} (1950)
GRB_DEC:         +86.4296d {+86d 25' 46.5"} (J2000),
                 +86.4392d {+86d 26' 21.1"} (current),
                 +86.3861d {+86d 23' 10.0"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17090 TJD;    68 DOY;   15/03/09
IMG_START_TIME:  83399.00 SOD {23:09:59.00} UT,   412.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       349.96d {+23h 19m 49s}   -4.32d {-04d 19' 23"}
SUN_DIST:         93.34 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      213.64d {+14h 14m 32s}  -11.08d {-11d 05' 01"}
MOON_DIST:        99.41 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      118.93, 27.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       88.71, 70.10 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #17554
R. Cunniffe, M. Jelinek, Y. Hu, S. Jeong, S. R. Oates and B. Zhang (IAA-CSIC) and A. J. Castro-Tirado (IAA-CSIC and ISA-UMA), on behalf of a larger collaboration, report:
Both the 60 cm BOOTES-2/TELMA and the 30 cm BOOTES-1 robotic telescopes in South Spain automatically responded to the Swift trigger of GRB 150309A (Cummings et al., GCN 17553). The first exposure started at 23:04:33 UT (86s after the trigger) and a sequence of 20 images was obtained (3s each, clear filter). A median combined image revealed no optical counterpart at the enhanced XRT error circle down to 18 mag. Further observations are ongoing.
GCN Circular #17555
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 853 s of XRT Photon Counting mode data and 2 UVOT images for GRB 150309A, 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 = 277.10213, +86.42875 which is equivalent to:
```
RA (J2000): 18h 28m 24.51s
Dec (J2000): +86d 25' 43.5"
```
with an uncertainty of 1.5 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 #17556
A. Melandri (INAF-OAB), D. Kopac (LJMU), R. J. Smith (LJMU), C. G. Mundell (U. Bath) and A. Gomboc (U. Ljubljana), on behalf of a large collaboration report:
The 2-m Liverpool Telescope robotically followed up Swift GRB 150309A (Cummings et al., GCN 17553) at 23:06:37 UT (~3.5 min after the burst trigger).
No optical counterpart is detected at the enhanced XRT error circle (Osborne et al., GCN 17555) down to r > 19.5 mag (~37 min after burst).
GCN Circular #17557
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), D.N. Burrows (PSU) and J.R. Cummings report on behalf of the Swift-XRT team:
We have analysed 6.9 ks of XRT data for GRB 150309A (Cummings et al. GCN Circ. 17553), from 122 s to 17.9 ks after the BAT trigger. The data comprise 273 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 17555).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.11 (+0.09, -0.07), followed by a break at T+477 s to an alpha of 0.98 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.82 (+/-0.07). The best-fitting absorption column is 2.03 (+0.28, -0.27) x 10^21 cm^-2, in excess of the Galactic value of 9.1 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.91 (+0.12, -0.11) and a best-fitting absorption column of 2.8 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.8 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 9.1 x 10^20 cm^-2
Excess significance: 6.6 sigma
Photon index:	     1.91 (+0.12, -0.11)
```
If the light curve continues to decay with a power-law decay index of 0.98, the count rate at T+24 hours will be 0.022 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.4 x 10^-13 (1.2 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/00634200.
This circular is an official product of the Swift-XRT team.
GCN Circular #17558
E. Gorbovskoy, V. Lipunov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D.Kuvshinov, V.Kornilov, Lomonosov Moscow State University, Sternberg Astronomical Institute
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk
V.Krushinsky, Ural Federal University, Yekaterinburg, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope ( Lipunov et al., Advances in Astronomy, vol. 2010, pp. 1-7, MASTER Global Robotic Net, 2010) located in Kislovodsk was pointed to the GRB150309A 21 sec after notice time and 96 sec after trigger time at 2015-03-09 23:04:45 UT in two polarizations. On our first (20s exposure) set we not found optical transient within SWIFT error-box (Cummings et al GCN 17553) brighter then 17.2
Before this, the MASTER serial pointed to FERMI (trig. N 447634793) coordinates. Due to this pointings we have a two images from MASTER VWF very wide fild camera obtained at 2015-03-09 23:00:34 i.e. 152 sec before SWIFT BAT and 44 sec after FERMI GBM trigger times. We not found new OT on this 5 sec exposure images with upper limit 12.0 at SWIFT position.
Table 1. GRB 150309A MASTER optical upper limits.
```
Tstart  Tst-T0 Tmid-T0 Expt Mlimit  Instrum.   Coadd.
23:00:34  -152    -149    5 12.0    MASTER VWF   no
23:04:45    98     108   20 17.2    MASTER II    no
23:04:45    98     559  780 19.3    MASTER II    10
23:20:20  1033    2363 2160 20.0    MASTER II    12
```
T0 - is a SWIFT trigger time.
The message may be cited.
GCN Circular #17559
S. R. Oates (IAA-CSIC/UCL-MSSL) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150309A 140 s after the BAT trigger (Cummings et al., GCN Circ. 17553). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 17555) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           140          290          147         >20.3
u_FC               299          549          246         >19.4
white              140        12463          881         >21.1
v                  630         6293          432         >19.3
b                  555        12046         1121         >20.8
u                  299        17720         2241         >21.1
w1                 679        16806         1318         >20.8
m2                 654         6498          432         >20.1
w2                 605         6089          432         >20.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.14 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17560
B. Dintinjana, S. Maticic and H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory.
We observed the field of GRB 150309A (Cummings et al., GCN 17553) from Crni Vrh Observatory with a 60 cm robotic telescope and clear filter. Twenty six consecutive exposures of 60 second duration were taken in moonlight conditions. First exposure started at 2015-03-09 23:05:34 UT, 68 seconds after the SWIFT trigger.
No optical candidate was detected within the uncertainty radius on single exposures, having limiting magnitude 19.2, calibrated against the nerby USNO-B R2 magnitude stars. Also we found no optical candidate on 26 sumed unfiltered images with total exposure of 1560 seconds and limiting magnitude 20.8 (calibrated against the nerby USNO-B R2 magnitude stars).
GCN Circular #17561
O.J Roberts (UCD) and M. Stanbro (UAH) report on behalf of the Fermi GBM Team:
"At 22:59:50.66 UT on the 9th of March 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150309A (trigger 447634793/150309958), the second episode of which was also detected by Swift (Cummings et al. 2015, GCN 17553). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 60 degrees.
The Swift trigger is observed in the GBM light curve at T0+200 s as a very soft, weak event with a duration of about 60 s. The immediate light curve at the GBM trigger time consists of a bright, main peak of unresolved emission episodes, with a duration (T90) of about 52 s (50-300 keV). The time-averaged spectrum from T0+0.0 s to T0+52.6 s is best fit by a Band function with Epeak= 165 +/- 4 keV, alpha = -0.59 +/- 0.02 and beta = -2.59 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is (3.9 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+17.5 s in the 10-1000 keV band is 15.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #17562
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+471 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150309A (trigger #634200) (Cummings, et al., GCN Circ. 17553). The BAT ground-calculated position is RA, Dec = 277.004, 86.417 deg which is
```
   RA(J2000)  =  18h 28m 01.0s
   Dec(J2000) = +86d 25' 02.7"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The mask-weighted light curve shows that the main peak of the burst, which occurred during a Swift preplanned slew maneuver, started at about T-200 seconds. The roughly symmetrical peak with multiple maxima lasted until about T-160 seconds. A weaker overlapping peak followed at about T-150 seconds and declined to background by about T-60 seconds. BAT triggered on a smaller peak that lasted from about T+0 seconds to about T+120 seconds. T90 (15-350 keV) is 242 +- 6 sec (estimated error including systematics). Because the source came into the BAT field of view during the slew, it is possible that there was some additional low-level emission before T-200 seconds.
The time-averaged spectrum from T-197.32 to T+119.08 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.05 +- 0.16, and Epeak of 175.8 +- 76.0 keV (chi squared 37.47 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.7 +- 0.0 x 10^-05 erg/cm2 and the 1-sec peak flux measured from T-177.49 sec in the 15-150 keV band is 9.0 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.36 +- 0.04 (chi squared 49.55 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/634200/BA/
GCN Circular #17564
E. Vazaeva (IKI), V. Nevskiy (ISON), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI),report on behalf of larger collaboration:
We observed the field of the Swift GRB 150309A (Cummings et al., GCN 17553) with Santel-400AN telescope of ISON-Kislovodsk observatory starting on Mar. 09 (UT) 23:11:26, i.e. ~8.5 min after the burst trigger. In the enhanced XRT position (Osborne et al., GCN 17555) we do not detect any object. An upper limit is following
```
Date       UT start   t-T0    Filter   Exp.     UL(3 sigma)
                      (mid, days)        (s)

2014-09-03 23:11:26  0.02590  None     49*60    20.0
```
The photometry is based on USNO-B1.0 star
```
USNO-B1.0_id  R2

1764-0030460  15.42
```
GCN Circular #17565
V. Rumyantsev (CrAO), K. Antoniuk, E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150309A (Cummings et al., GCN 17553) with AZT-11 telescope of CrAO observatory starting on Mar. 09 (UT) 23:39:47. We took several images in R-filter of 180 s exposure. In the enhanced XRT position (Osborne et al., GCN 17555) we do not detect any object. An upper limit is following
```
Date       UT start,  t-t0     Filter   Exp.      UL (3 sigma)
                       (mid, days)        (s)

2015-03-09 23:39:47   0.0468   R        20*180    20.9
```
The photometry is based on nearby USNO-B1.0 stars.
GCN Circular #17566
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 150309A (Swift-BAT trigger #634200: Cummings et al., GCN 17553; Baumgartner et al., GCN 17562) triggered Konus-Wind at T0=82792.708 s UT (22:59:52.708).
The KW light curve shows a broad emission pulse which starts at ~T0-7 s and decays to ~T0+55 s. The pulse is followed by a weak soft emission detectable up to ~T0+250 s. The emission is visible up to ~4 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150309_T82792/
As observed by Konus-Wind, the burst had a fluence of 4.1(-0.4,+0.5)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+16.832 s, of 4.0(-0.4,+0.4)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum (measured from T0 to T0+53.248 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.79 (-0.09,+0.11), the high energy photon index beta = -2.79 (-0.48,+0.29), the peak energy Ep = 182 (-17,+14) keV, chi2 = 101/97 dof.
The spectrum near the peak count rate (measured from T0+8.448 to T0+20.480 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.64 (-0.09,+0.11), the high energy photon index beta = -2.73 (-0.34,+0.22), the peak energy Ep = 197 (-17,+16) keV, chi2 = 110/97 dof.
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #17570
E. Mazaeva (IKI), R. Inasaridze (AAO), Sh. Makandarashvili (AAO), A. Volnova (IKI), Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150309A (Cummings et al., GCN 17553) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Mar. 10 (UT) 01:40:54. Within the enhanced XRT position (Osborne et al., GCN 17555) we do not detect any object. An upper limit is following
```
Date       UT start   t-T0    Filter   Exp.     UL(3 sigma)
                      (mid, days)        (s)

2015-03-10 01:40:54  0.12699  None     19*120   21.2
```
The photometry is based on USNO-B1.0 star
```
USNO-B1.0_id  R2
1764-0030460  15.42
```

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Jochen Greiner, last update: 12-Mar-2015 [Disclaimer]