Gamma-ray Burst 131002B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 10:54:49 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     572742,   Seg_Num: 0
GRB_RA:           75.061d {+05h 00m 15s} (J2000),
                  74.947d {+04h 59m 47s} (current),
                  75.482d {+05h 01m 56s} (1950)
GRB_DEC:         -75.727d {-75d 43' 35"} (J2000),
                 -75.707d {-75d 42' 23"} (current),
                 -75.797d {-75d 47' 50"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4625 [cnts]    Image_Peak=176 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       29662 [cnts]
BKG_TIME:        39252.89 SOD {10:54:12.89} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16567 TJD;   275 DOY;   13/10/02
GRB_TIME:        39268.51 SOD {10:54:28.51} UT
GRB_PHI:         -24.76 [deg]
GRB_THETA:         7.34 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     12.60 [sigma]
IMAGE_SIGNIF:    6.78 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0  +3  +0 
SUN_POSTN:       188.65d {+12h 34m 35s}   -3.73d {-03d 43' 41"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.32d {+10h 33m 16s}   +4.22d {+04d 12' 58"}
MOON_DIST:        92.45 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      290.84,-79.71 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 252.43,-14.88 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 10:56:21 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     572742,   Seg_Num: 0
GRB_RA:           75.1213d {+05h 00m 29.11s} (J2000),
                  75.0075d {+05h 00m 01.78s} (current),
                  75.5402d {+05h 02m 09.65s} (1950)
GRB_DEC:         -75.7017d {-75d 42' 06.1"} (J2000),
                 -75.6820d {-75d 40' 55.0"} (current),
                 -75.7722d {-75d 46' 19.9"} (1950)
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.25e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.47 [sigma]
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39321.35 SOD {10:55:21.35} UT,   52.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.21 261.54 243.65
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       188.65d {+12h 34m 35s}   -3.73d {-03d 43' 43"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.33d {+10h 33m 20s}   +4.21d {+04d 12' 42"}
MOON_DIST:        92.44 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.83,-32.97 [deg] galactic lon,lat of the burst
ECL_COORDS:      290.85,-79.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.74 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 10:56:50 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     572742,   Seg_Num: 0
GRB_RA:           75.1213d {+05h 00m 29.1s} (J2000),
                  75.0075d {+05h 00m 01.7s} (current),
                  75.5402d {+05h 02m 09.6s} (1950)
GRB_DEC:         -75.7017d {-75d 42' 06.1"} (J2000),
                 -75.6820d {-75d 40' 55.0"} (current),
                 -75.7722d {-75d 46' 19.9"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39321.35 SOD {10:55:21.35} UT,   52.8 [sec] since BAT Trigger Time
CENTROID_X:      304.94,  raw= 305  [pixels]
CENTROID_Y:      334.95,  raw= 335  [pixels]
ROLL:            113.77 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   87.12
GRB_POS_XRT_Z:   2.93
IMAGE_URL:       sw00572742000msxps_rw.img
SUN_POSTN:       188.65d {+12h 34m 36s}   -3.73d {-03d 43' 43"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.34d {+10h 33m 20s}   +4.21d {+04d 12' 37"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.83,-32.97 [deg] galactic lon,lat of the burst
ECL_COORDS:      290.85,-79.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 10:56:33 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     572742,   Seg_Num: 0
GRB_RA:           75.1213d {+05h 00m 29.1s} (J2000),
                  75.0075d {+05h 00m 01.7s} (current),
                  75.5402d {+05h 02m 09.6s} (1950)
GRB_DEC:         -75.7017d {-75d 42' 06.1"} (J2000),
                 -75.6820d {-75d 40' 55.0"} (current),
                 -75.7722d {-75d 46' 19.9"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39321.35 SOD {10:55:21.35} UT,   52.8 [sec] since BAT Trigger Time
CENTROID_X:      304.94,  raw= 305  [pixels]
CENTROID_Y:      334.95,  raw= 335  [pixels]
ROLL:            113.77 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   87.12
GRB_POS_XRT_Z:   2.93
IMAGE_URL:       sw00572742000msxps_rw.img
SUN_POSTN:       188.65d {+12h 34m 35s}   -3.73d {-03d 43' 43"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.33d {+10h 33m 20s}   +4.21d {+04d 12' 40"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.83,-32.97 [deg] galactic lon,lat of the burst
ECL_COORDS:      290.85,-79.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 11:01:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     3115089,   Seg_Num: 67
GRB_RA:           75.061d {+05h 00m 15s} (J2000),
                  74.947d {+04h 59m 47s} (current),
                  75.482d {+05h 01m 56s} (1950)
GRB_DEC:         -75.727d {-75d 43' 35"} (J2000),
                 -75.707d {-75d 42' 23"} (current),
                 -75.797d {-75d 47' 50"} (1950)
GRB_DATE:        16567 TJD;   275 DOY;   13/10/02
GRB_TIME:        39268.51 SOD {10:54:28.51} UT
TRIGGER_INDEX:   146
GRB_PHI:         -24.76 [deg]
GRB_THETA:         7.34 [deg]
DELTA_TIME:      20678.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00572742000msb.lc
SUN_POSTN:       188.65d {+12h 34m 36s}   -3.73d {-03d 43' 48"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.37d {+10h 33m 30s}   +4.20d {+04d 11' 48"}
MOON_DIST:        92.45 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      290.84,-79.71 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 252.43,-14.88 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 11:13:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.086d {+05h 00m 21s} (J2000)
POINT_DEC:       -75.724d {-75d 43' 27"} (J2000)
POINT_ROLL:      113.766d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39330.59 SOD {10:55:30.59} UT,   62.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.011
N_STARS:         105
X_OFFSET:        472 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1431 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00572742000msufc0062.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 00"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.47d {+10h 33m 54s}   +4.16d {+04d 09' 43"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.82,-79.72 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 11:13:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.086d {+05h 00m 21s} (J2000)
POINT_DEC:       -75.724d {-75d 43' 27"} (J2000)
POINT_ROLL:      113.766d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39330.59 SOD {10:55:30.59} UT,   62.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.011
N_STARS:         105
X_OFFSET:        472 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1431 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00572742000msufc0062.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 00"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.48d {+10h 33m 55s}   +4.16d {+04d 09' 38"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.82,-79.72 [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:     Wed 02 Oct 13 11:14:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.086d {+05h 00m 21s} (J2000)
POINT_DEC:       -75.724d {-75d 43' 27"} (J2000)
ROLL:            113.766d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39330.59 SOD {10:55:30.59} UT,   62.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     402404141
X_OFFSET:        717 [pixels]
Y_OFFSET:        730 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       877
Y_GRB_POS:       890
BINNING_INDEX:   1
IM_URL:          sw00572742000msuni0074.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 01"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.49d {+10h 33m 57s}   +4.16d {+04d 09' 29"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.82,-79.72 [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:     Wed 02 Oct 13 11:15:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.086d {+05h 00m 21s} (J2000)
POINT_DEC:       -75.724d {-75d 43' 27"} (J2000)
ROLL:            113.766d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39330.59 SOD {10:55:30.59} UT,   62.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     402404141
X_OFFSET:        717 [pixels]
Y_OFFSET:        730 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       877
Y_GRB_POS:       890
BINNING_INDEX:   1
IM_URL:          sw00572742000msuni0074.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 01"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.49d {+10h 33m 57s}   +4.16d {+04d 09' 25"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.82,-79.72 [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:     Wed 02 Oct 13 11:15:36 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.084d {+05h 00m 20s} (J2000)
POINT_DEC:       -75.723d {-75d 43' 20"} (J2000)
POINT_ROLL:      113.770d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39543.42 SOD {10:59:03.42} UT,   274.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.169
N_STARS:         25
X_OFFSET:        397 [pixels]
Y_OFFSET:        410 [pixels]
X_MAX:           1356 [pixels]
Y_MAX:           1369 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00572742000msufc0274.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 01"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.49d {+10h 33m 58s}   +4.16d {+04d 09' 21"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.83,-79.72 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 02 Oct 13 11:16:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.084d {+05h 00m 20s} (J2000)
POINT_DEC:       -75.723d {-75d 43' 20"} (J2000)
POINT_ROLL:      113.770d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39543.42 SOD {10:59:03.42} UT,   274.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.169
N_STARS:         25
X_OFFSET:        397 [pixels]
Y_OFFSET:        410 [pixels]
X_MAX:           1356 [pixels]
Y_MAX:           1369 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00572742000msufc0274.fits
SUN_POSTN:       188.66d {+12h 34m 38s}   -3.73d {-03d 44' 02"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.50d {+10h 33m 59s}   +4.15d {+04d 09' 17"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.83,-79.72 [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:     Wed 02 Oct 13 11:16:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.084d {+05h 00m 20s} (J2000)
POINT_DEC:       -75.723d {-75d 43' 20"} (J2000)
ROLL:            113.770d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39543.42 SOD {10:59:03.42} UT,   274.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     402404354
X_OFFSET:        717 [pixels]
Y_OFFSET:        730 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       877
Y_GRB_POS:       890
BINNING_INDEX:   1
IM_URL:          sw00572742000msuni0286.fits
SUN_POSTN:       188.66d {+12h 34m 39s}   -3.73d {-03d 44' 02"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.50d {+10h 34m 00s}   +4.15d {+04d 09' 10"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.83,-79.72 [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:     Wed 02 Oct 13 11:16:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     572742,   Seg_Num: 0
POINT_RA:         75.084d {+05h 00m 20s} (J2000)
POINT_DEC:       -75.723d {-75d 43' 20"} (J2000)
ROLL:            113.770d
IMG_START_DATE:  16567 TJD;   275 DOY;   13/10/02
IMG_START_TIME:  39543.42 SOD {10:59:03.42} UT,   274.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     402404354
X_OFFSET:        717 [pixels]
Y_OFFSET:        730 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       877
Y_GRB_POS:       890
BINNING_INDEX:   1
IM_URL:          sw00572742000msuni0286.fits
SUN_POSTN:       188.66d {+12h 34m 39s}   -3.73d {-03d 44' 03"}
SUN_DIST:         92.06 [deg]   Sun_angle= 7.6 [hr] (West of Sun)
MOON_POSTN:      158.50d {+10h 34m 01s}   +4.15d {+04d 09' 08"}
MOON_DIST:        92.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      287.86,-32.97 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.83,-79.72 [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 #15284
M. C. Stroh (PSU), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), C. Gronwall (PSU), J. A. Kennea (PSU), P. T. O'Brien (U Leicester), T. Sakamoto (AGU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 10:54:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 131002B (trigger=572742). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 75.061, -75.727 which is
```
   RA(J2000) = 05h 00m 15s
   Dec(J2000) = -75d 43' 35"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak with a duration of about 40 sec. The peak count rate was ~1800 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 10:55:21.3 UT, 52.8 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 75.1213, -75.7017 which is equivalent to:
```
   RA(J2000)  = +05h 00m 29.11s
   Dec(J2000) = -75d 42' 06.1"
```
with an uncertainty of 5.9 arcseconds (radius, 90% containment). This location is 105 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 7.25e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 62 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 0.12.
Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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 Circular #15291
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 923 s of XRT Photon Counting mode data and 2 UVOT images for GRB 131002B, 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 = 75.12235, -75.70299 which is equivalent to:
```
RA (J2000): 05h 00m 29.37s
Dec (J2000): -75d 42' 10.8"
```
with an uncertainty of 2.2 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 #15295
A. A. Breeveld (UCL-MSSL) and M. C. Stroh (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131002B 62 s after the BAT trigger (Stroh et al., GCN Circ. 15284). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 15291) is detected in the initial UVOT exposures. There is a DSS source lying just on the edge of the XRT region at 05:00:29.386 -75:42:07.58. 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            62          212          147         >21.8
white             5216         5416          197         >22.1
v                 5627         5826          197         >20.3
b                 5011         6512          260         >21.4
u                  275         6442          274         >21.0
w1                6037         6237          197         >20.4
m2                5832         6031          197         >20.1
w2                5422         5622          197         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15296
M.C. Stroh and B. Sbarufatti report on behalf of the Swift-XRT team:
We have analysed 1.8 ks of XRT data for GRB 131002B, from 58 s to 6.5 ks after the BAT trigger. The data comprise 282 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode.
The light curve consists of a relatively flat region of WT data from T+58 to T+333 s with a count rate ranging between 10 and 50 cts/s. The WT observation ended when Swift entered the SAA. PC data exists from T+5.0 to T+6.5 ks with a count rates between 0.1 and 0.04 cts/s. Since there is only 1.8ks of data on this source, it is difficult to be confident that a fit to these data points truly models the overall behavior in this GRB.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.46 (+0.04, -0.03). The best-fitting absorption column is consistent with the Galactic value of 9.1 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Galactic foreground: 9.1 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.46 (+0.04, -0.03)
```
If the light curve continues to decay with a power-law decay index of 2.05, the count rate at T+24 hours will be 2.0 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.2 x 10^-15 (1.0 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00572742.
This circular is an official product of the Swift-XRT team.
GCN Circular #15297
V. Sudilovsky (MPE Garching), S. Schmidl (TLS Tautenburg) and J.Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 131002B (Swift trigger 572742, Stroh et al., GCN 15284) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started on October 03, 2013, at 03:15:17 UT, 16.35 hrs after the GRB trigger. They were performed at an average seeing of 1".8 and at an average airmass of 2.0 .
We do not detect any fading source inside the 2".2 XRT error circle (Beardmore et al., GCN 15291). Based on a total exposure time of 1500 s in g'r'i'z' and 1200 s in JHK, at a midtime of 16.59 hrs after the burst, we estimate the following preliminary 3-sigma upper limits (all in AB system) of
g' > 24.7 mag,
r' > 24.4 mag,
i' > 23.7 mag,
z' > 23.5 mag,
J > 21.6 mag,
H > 21.0 mag and
K > 20.4 mag.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.12 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15298
G. Sato (ISAS), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), M. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU), (i.e. the Swift-BAT team):
Using the data set from T-240 to T+418 sec from the recent telemetry downlink, we report further analysis of BAT GRB 131002B (trigger #572742) (Stroh, et al., GCN Circ. 15284). The BAT ground-calculated position is RA, Dec = 75.135, -75.701 deg which is
```
  RA(J2000)  =  05h 00m 32.4s
  Dec(J2000) = -75d 42' 05.2"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single wide peak that has a main pulse starts at ~T-6 and ends at ~T+20, and the remaining emission lasts until ~T+42. T90 (15-350 keV) is 39.10 +- 8.08 sec (estimated error including systematics).
The time-averaged spectrum from T-5.95 to T+41.60 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.36 +- 0.84, and Epeak of 34.0 +- 4.3 keV (chi squared 62.16 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.2 +- 0.6 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+5.48 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.15 +- 0.14 (chi squared 81.27 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/572742/BA/

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Jochen Greiner, last update: 03-Oct-2013 [Disclaimer]