Gamma-ray Burst 100915A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:32:22 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.648d {+21h 02m 36s} (J2000),
                 315.693d {+21h 02m 46s} (current),
                 315.437d {+21h 01m 45s} (1950)
GRB_DEC:         +65.667d {+65d 39' 60"} (J2000),
                 +65.709d {+65d 42' 33"} (current),
                 +65.468d {+65d 28' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1530 [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:        15454 TJD;   258 DOY;   10/09/15
GRB_TIME:        5465.82 SOD {01:31:05.82} UT
GRB_PHI:         -103.68 [deg]
GRB_THETA:        26.85 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.67 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +0 +27  +0 
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 40"}
SUN_DIST:        106.14 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.20d {+17h 16m 49s}  -24.80d {-24d 48' 10"}
MOON_DIST:       100.15 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.15, 12.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       18.43, 71.91 [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 = 322.20,8.63 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:33:46 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.6966d {+21h 02m 47.18s} (J2000),
                 315.7416d {+21h 02m 57.98s} (current),
                 315.4851d {+21h 01m 56.41s} (1950)
GRB_DEC:         +65.6744d {+65d 40' 27.8"} (J2000),
                 +65.7171d {+65d 43' 01.4"} (current),
                 +65.4755d {+65d 28' 31.8"} (1950)
GRB_ERROR:       6.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.89e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.69 [sigma]
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5597.71 SOD {01:33:17.71} UT,   131.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.70 237.21 261.57 243.61
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 38"}
SUN_DIST:        106.15 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.22d {+17h 16m 52s}  -24.80d {-24d 48' 10"}
MOON_DIST:       100.16 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.17, 12.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.48, 71.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.28 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:33:56 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.6966d {+21h 02m 47.1s} (J2000),
                 315.7416d {+21h 02m 57.9s} (current),
                 315.4851d {+21h 01m 56.4s} (1950)
GRB_DEC:         +65.6744d {+65d 40' 27.8"} (J2000),
                 +65.7171d {+65d 43' 01.4"} (current),
                 +65.4755d {+65d 28' 31.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5597.71 SOD {01:33:17.71} UT,   131.9 [sec] since BAT Trigger Time
CENTROID_X:      279.13,  raw= 279  [pixels]
CENTROID_Y:      262.20,  raw= 262  [pixels]
ROLL:            321.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -84.38
GRB_POS_XRT_Z:   -54.60
IMAGE_URL:       sw00434178000msxps_rw.img
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 38"}
SUN_DIST:        106.15 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.22d {+17h 16m 52s}  -24.80d {-24d 48' 10"}
MOON_DIST:       100.16 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.17, 12.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.48, 71.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:34:04 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.6966d {+21h 02m 47.1s} (J2000),
                 315.7416d {+21h 02m 57.9s} (current),
                 315.4851d {+21h 01m 56.4s} (1950)
GRB_DEC:         +65.6744d {+65d 40' 27.8"} (J2000),
                 +65.7171d {+65d 43' 01.4"} (current),
                 +65.4755d {+65d 28' 31.8"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5597.71 SOD {01:33:17.71} UT,   131.9 [sec] since BAT Trigger Time
CENTROID_X:      279.13,  raw= 279  [pixels]
CENTROID_Y:      262.20,  raw= 262  [pixels]
ROLL:            321.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -84.38
GRB_POS_XRT_Z:   -54.60
IMAGE_URL:       sw00434178000msxps_rw.img
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 38"}
SUN_DIST:        106.15 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.22d {+17h 16m 53s}  -24.80d {-24d 48' 10"}
MOON_DIST:       100.16 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.17, 12.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.48, 71.89 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:35:24 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.648d {+21h 02m 36s} (J2000),
                 315.693d {+21h 02m 46s} (current),
                 315.437d {+21h 01m 45s} (1950)
GRB_DEC:         +65.667d {+65d 39' 60"} (J2000),
                 +65.709d {+65d 42' 33"} (current),
                 +65.468d {+65d 28' 04"} (1950)
GRB_DATE:        15454 TJD;   258 DOY;   10/09/15
GRB_TIME:        5465.82 SOD {01:31:05.82} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -103.68 [deg]
GRB_THETA:        26.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.67 [sigma]
LC_URL:          sw00434178000msb.lc
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 37"}
SUN_DIST:        106.14 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.23d {+17h 16m 56s}  -24.80d {-24d 48' 09"}
MOON_DIST:       100.14 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.15, 12.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       18.43, 71.91 [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 = 322.20,8.63 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:36:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.673d {+21h 02m 42s} (J2000)
POINT_DEC:       +65.648d {+65d 38' 53"} (J2000)
POINT_ROLL:      321.162d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5606.24 SOD {01:33:26.24} UT,   140.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.871
N_STARS:         156
X_OFFSET:        640 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0140.fits
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 36"}
SUN_DIST:        106.16 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.24d {+17h 16m 58s}  -24.80d {-24d 48' 09"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.38, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:36:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.673d {+21h 02m 42s} (J2000)
POINT_DEC:       +65.648d {+65d 38' 53"} (J2000)
POINT_ROLL:      321.162d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5606.24 SOD {01:33:26.24} UT,   140.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.871
N_STARS:         156
X_OFFSET:        640 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0140.fits
SUN_POSTN:       172.76d {+11h 31m 03s}   +3.13d {+03d 07' 35"}
SUN_DIST:        106.16 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.25d {+17h 16m 59s}  -24.80d {-24d 48' 09"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.38, 71.89 [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 15 Sep 10 01:36:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.673d {+21h 02m 42s} (J2000)
POINT_DEC:       +65.648d {+65d 38' 53"} (J2000)
POINT_ROLL:      321.162d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5606.24 SOD {01:33:26.24} UT,   140.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.871
N_STARS:         156
X_OFFSET:        640 [pixels]
Y_OFFSET:        488 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1447 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0140.fits
SUN_POSTN:       172.76d {+11h 31m 02s}   +3.13d {+03d 07' 36"}
SUN_DIST:        106.16 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.24d {+17h 16m 58s}  -24.80d {-24d 48' 09"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.38, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:37:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.673d {+21h 02m 42s} (J2000)
POINT_DEC:       +65.648d {+65d 38' 53"} (J2000)
ROLL:            321.162d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5606.24 SOD {01:33:26.24} UT,   140.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     306207212
X_OFFSET:        984 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0147.fits
SUN_POSTN:       172.76d {+11h 31m 03s}   +3.13d {+03d 07' 34"}
SUN_DIST:        106.16 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.26d {+17h 17m 01s}  -24.80d {-24d 48' 09"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.38, 71.89 [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 15 Sep 10 01:38:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.673d {+21h 02m 42s} (J2000)
POINT_DEC:       +65.648d {+65d 38' 53"} (J2000)
ROLL:            321.162d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5606.24 SOD {01:33:26.24} UT,   140.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     306207212
X_OFFSET:        984 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0147.fits
SUN_POSTN:       172.76d {+11h 31m 03s}   +3.13d {+03d 07' 34"}
SUN_DIST:        106.16 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.26d {+17h 17m 02s}  -24.80d {-24d 48' 08"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.38, 71.89 [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 15 Sep 10 01:44:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 49"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5766.27 SOD {01:36:06.27} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.511
N_STARS:         73
X_OFFSET:        664 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1623 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00434178000msufc0300.fits
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 28"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.32d {+17h 17m 16s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.11 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:44:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 49"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5766.27 SOD {01:36:06.27} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.511
N_STARS:         73
X_OFFSET:        664 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1623 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00434178000msufc0300.fits
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 28"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.32d {+17h 17m 16s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.11 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:44:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 49"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5766.27 SOD {01:36:06.27} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.511
N_STARS:         73
X_OFFSET:        664 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1623 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00434178000msufc0300.fits
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 28"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.32d {+17h 17m 17s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.11 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [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 15 Sep 10 01:44:49 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     434178,   Seg_Num: 0
GRB_RA:          315.6945d {+21h 02m 46.68s} (J2000),
                 315.7395d {+21h 02m 57.48s} (current),
                 315.4829d {+21h 01m 55.90s} (1950)
GRB_DEC:         +65.6731d {+65d 40' 23.1"} (J2000),
                 +65.7158d {+65d 42' 56.7"} (current),
                 +65.4742d {+65d 28' 27.2"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5697.00 SOD {01:34:57.00} UT,   231.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 28"}
SUN_DIST:        106.15 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.32d {+17h 17m 18s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.13 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.17, 12.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       18.47, 71.89 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:45:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 49"} (J2000)
ROLL:            321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5766.27 SOD {01:36:06.27} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     306207372
X_OFFSET:        984 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0307.fits
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 27"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.33d {+17h 17m 19s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.11 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [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 15 Sep 10 01:45:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 49"} (J2000)
ROLL:            321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  5766.27 SOD {01:36:06.27} UT,   300.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     306207372
X_OFFSET:        984 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1144
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0307.fits
SUN_POSTN:       172.77d {+11h 31m 04s}   +3.12d {+03d 07' 27"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.33d {+17h 17m 20s}  -24.80d {-24d 48' 06"}
MOON_DIST:       100.10 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [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 15 Sep 10 01:50:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 48"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  6344.30 SOD {01:45:44.30} UT,   878.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.023
N_STARS:         190
X_OFFSET:        424 [pixels]
Y_OFFSET:        398 [pixels]
X_MAX:           1863 [pixels]
Y_MAX:           1837 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0878.fits
SUN_POSTN:       172.77d {+11h 31m 05s}   +3.12d {+03d 07' 22"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.38d {+17h 17m 32s}  -24.80d {-24d 48' 04"}
MOON_DIST:       100.09 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:50:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 48"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  6344.30 SOD {01:45:44.30} UT,   878.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.023
N_STARS:         190
X_OFFSET:        424 [pixels]
Y_OFFSET:        398 [pixels]
X_MAX:           1863 [pixels]
Y_MAX:           1837 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0878.fits
SUN_POSTN:       172.77d {+11h 31m 05s}   +3.12d {+03d 07' 22"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.38d {+17h 17m 32s}  -24.80d {-24d 48' 04"}
MOON_DIST:       100.09 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #11277
O. M. Littlejohns (U Leicester), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), A. Rowlinson (U Leicester), M. H. Siegel (PSU) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 01:31:05 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100915A (trigger=434178). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 315.648, +65.667 which is
```
   RA(J2000) = 21h 02m 36s
   Dec(J2000) = +65d 39' 60"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is a BAT image-only trigger with significance reported on-board of 8.67 sigma. Ground processing of the BAT scaled map image indicates a slightly weaker, 6.4 sigma excess. As is typical for such triggers, there is nothing obvious in the raw light curve. We will need to wait for event-by-event data on the ground to clarify the nature of the light curve.
The XRT began observing the field at 01:33:17.7 UT, 131.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 315.6937, 65.6731 which is equivalent to:
```
   RA(J2000)  = 21h 02m 46.50s
   Dec(J2000) = +65d 40' 23.0"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 71 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 consistent with the Galactic value of 2.27 x 10^21 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 5.89e-10 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 0.51.
Burst Advocate for this burst is O. M. Littlejohns (oml2 AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 Sep 10 01:51:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 48"} (J2000)
POINT_ROLL:      321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  6344.30 SOD {01:45:44.30} UT,   878.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.023
N_STARS:         190
X_OFFSET:        424 [pixels]
Y_OFFSET:        398 [pixels]
X_MAX:           1863 [pixels]
Y_MAX:           1837 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00434178000msufc0878.fits
SUN_POSTN:       172.77d {+11h 31m 05s}   +3.12d {+03d 07' 22"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.39d {+17h 17m 33s}  -24.80d {-24d 48' 04"}
MOON_DIST:       100.09 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [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 15 Sep 10 01:52:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 48"} (J2000)
ROLL:            321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  6344.30 SOD {01:45:44.30} UT,   878.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     306207950
X_OFFSET:        983 [pixels]
Y_OFFSET:        957 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1143
Y_GRB_POS:       1117
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0885.fits
SUN_POSTN:       172.77d {+11h 31m 05s}   +3.12d {+03d 07' 21"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.40d {+17h 17m 35s}  -24.80d {-24d 48' 04"}
MOON_DIST:       100.08 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [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:     Wed 15 Sep 10 01:52:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     434178,   Seg_Num: 0
POINT_RA:        315.680d {+21h 02m 43s} (J2000)
POINT_DEC:       +65.647d {+65d 38' 48"} (J2000)
ROLL:            321.168d
IMG_START_DATE:  15454 TJD;   258 DOY;   10/09/15
IMG_START_TIME:  6344.30 SOD {01:45:44.30} UT,   878.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     306207950
X_OFFSET:        983 [pixels]
Y_OFFSET:        957 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1143
Y_GRB_POS:       1117
BINNING_INDEX:   1
IM_URL:          sw00434178000msuni0885.fits
SUN_POSTN:       172.77d {+11h 31m 05s}   +3.12d {+03d 07' 20"}
SUN_DIST:        106.17 [deg]   Sun_angle= -9.5 [hr] (East of Sun)
MOON_POSTN:      259.40d {+17h 17m 36s}  -24.80d {-24d 48' 04"}
MOON_DIST:       100.08 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      102.14, 12.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       18.39, 71.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #11279
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 5278 s of XRT Photon Counting mode data and 9 UVOT images for GRB 100915A, 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 = 315.69440, +65.67303 which is equivalent to:
```
RA (J2000): 21h 02m 46.66s
Dec (J2000): +65d 40' 22.9"
```
with an uncertainty of 1.6 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 #11280
O. M. Littlejohns (U Leicester) reports on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 100915A (Littlejohns et al. GCN Circ. 11277), from 138 s to 18.8 ks after the BAT trigger. The data comprise 95 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 11279).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=0.9 (+0.6, -1.8). At T+320 s the decay steepens to an alpha of 2.4 (+0.6, -0.3). The light curve breaks again at T+1058 s to a decay with alpha=0.66 (+0.16, -5.16), before a final break at T+6126 s after which the decay index is 1.6 (+0.8, -0.3).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.37 (+0.21, -0.20). The best-fitting absorption column is 3.8 (+1.3, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 2.3 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.74 (+/-0.18) and a best-fitting absorption column of 4.6 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.5 x 10^-11 (8.2 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.6, the count rate at T+24 hours will be 1.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.7 x 10^-14 (8.4 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/00434178.
This circular is an official product of the Swift-XRT team.
GCN Circular #11281
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), O. M. Littlejohns (U Leicester), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100915A (trigger #434178) (Littlejohns, et al., GCN Circ. 11277). The BAT ground-calculated position is RA, Dec = 315.664, 65.676 deg, which is
```
   RA(J2000)  =  21h 02m 39.4s 
   Dec(J2000) = +65d 40' 32.3" 
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 54%.
The mask-weighted light curves shows two broad peaks, the first starting at ~T-90sec, peaking at ~T+5 sec, and ending at ~T+90 sec. The second, weaker peak starts at ~T+110, peaks at ~T+170 sec and ends at ~T+190 sec. T90 (15-350 keV) is 200 +- 31 sec (estimated error including systematics).
The time-averaged spectrum from T-36.3 to T+72.2 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 2.88 +- 0.00, and Epeak of 265.2 +- 0.0 keV (chi squared 66.1 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+8.76 sec in the 15-150 keV band is 0.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.50 +- 0.23 (chi squared 73.1 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/434178/BA/
GCN Circular #11282
C. A. Swenson (PSU) and O. M. Littlejohns (U Leicester) report on behalf of the Swift/UVOT team.
The Swift/UVOT began settled observations of the field of GRB 100915A 123s after the BAT trigger (Littlejohns et al., GCN Circ. 11277). No new source is found at the enhanced XRT position (Osborne et al., GCN Circ. 11279).
The 3-sigma uppder limits for the finding chart (fc) and summed exposures are reported below:
```
FILTER      T_start(s)    T_stop     Exposure      Mag/3UL
===========================================================
white fc        140          290        147        >21.46
white           142        11637       1619        >22.83
v               123        13122       1057        >20.98
b               557         7343        467        >21.43
u fc            300          550        246        >20.68
u               300         7161        963        >21.52
uvw1            680         6956        491        >20.87
uvm2           1256        18902       2787        >21.79
uvw2            606        12544       1152        >21.50
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.51 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #11283
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC) (i.e. the Swift-BAT team):
We would like to make corrections to the BAT refined analysis of GRB 100915A (GCN Circ. 11281). The BAT time-averaged spectrum is best fit by a simple power-law (PL) model rather than a power-law with an exponential cutoff (CPL) model. We believe a low signal to noise in the observed spectrum of this burst causes a significant improvement in chi2 by a CPL model over a PL model. We would like to correct the 3rd paragraph of GCN Circ. 11281 to:
"The time-averaged spectrum from T-36.3 to T+72.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.50 +- 0.24. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+8.76 sec in the 15-150 keV band is 0.5 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. "
We apologize for possible inconvenience. We would like to thank Eleonora Troja for pointing this issue.
GCN Circular #11285
T. Sakamoto (UMBC/GSFC), D. Donato (UMCP/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), Y. Urata (NCU), C.A. Wallace (FGCU)
We observed the field of GRB 100915A detected by Swift (trigger #434178; Littlejohns et al., GCN Circ. 11277) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
A total 423 images of 5 sec (200 images), 30 sec (80 images), 60 sec (120 images) and 100 sec (23 images) exposures were taken in the R filter starting from September 15 01:33:32 (UT) about 146 seconds after the trigger (70 seconds after the BAT position notice) and stopped on September 15 05:49:30 (UT). We do not detect the optical afterglow both in the individual images and the stacked image, which only combined good quality 418 images, inside the XRT position (Osborne et al., GCN #11279). The estimated five sigma upper limit of the combined image (total exposure of 12500 sec) is ~19.8 mag using the USNO-B1 catalog.
GCN Circular #11287
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 100915A (Littlejohns et al., GCN 11277) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 10 10:46:01 UT (~9.2 h after the trigger). We did not find any new point source within the enhanced XRT error circle (Osborne et al., GCNC 11279) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.40450    11:13:34   2760.0    >22.0  >21.5  >21.0
0.56696    15:07:30   4560.0    >22.5  >21.8  >21.1
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #11292
Klotz A. (CESR-OMP), Gendre B. (IASF), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 100915A detected by SWIFT (trigger 434178) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 97s after the GRB trigger (20s after the notice). The elevation of the field decreased from 47 degrees above horizon and weather conditions were good.
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). Time sampling is 10 seconds / pixel. We do not detect any OT with a limiting magnitude of: t0+97s to t0+157s : R > 17.2
We co-added a series of exposures: t0+174s to t0+394s : R > 19.0
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Report 302.1
GCN_Report 302.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_302_1.pdf by O.M. Littlejohns at U. Leicester titled: "Final report on Swift Observations of GRB 100915A"

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Jochen Greiner, last update: 15-Sep-2010 [Disclaimer]