Gamma-ray Burst 151001B

(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:     Thu 01 Oct 15 18:30:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.845d {+22h 27m 23s} (J2000),
                 336.974d {+22h 27m 54s} (current),
                 336.436d {+22h 25m 45s} (1950)
GRB_DEC:         +64.661d {+64d 39' 39"} (J2000),
                 +64.741d {+64d 44' 29"} (current),
                 +64.405d {+64d 24' 18"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=823 [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:        17296 TJD;   274 DOY;   15/10/01
GRB_TIME:        66576.78 SOD {18:29:36.78} UT
GRB_PHI:         123.13 [deg]
GRB_THETA:        33.14 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.40 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -3  +0  +1 +41  +0 
SUN_POSTN:       187.59d {+12h 30m 21s}   -3.28d {-03d 16' 33"}
SUN_DIST:        114.73 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.70d {+03h 50m 48s}  +15.63d {+15d 37' 36"}
MOON_DIST:        71.95 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.28,  5.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       27.53, 63.66 [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 = 349.21,20.17 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:32:25 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.8363d {+22h 27m 20.71s} (J2000),
                 336.9652d {+22h 27m 51.64s} (current),
                 336.4280d {+22h 25m 42.71s} (1950)
GRB_DEC:         +64.6933d {+64d 41' 35.8"} (J2000),
                 +64.7739d {+64d 46' 26.2"} (current),
                 +64.4377d {+64d 26' 15.8"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.89e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.93 [sigma]
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66715.68 SOD {18:31:55.68} UT,   138.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.18 261.66 243.55
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 35"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.72d {+03h 50m 52s}  +15.63d {+15d 37' 45"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.29,  6.00 [deg] galactic lon,lat of the burst
ECL_COORDS:       27.59, 63.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.96 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:32:34 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.8363d {+22h 27m 20.7s} (J2000),
                 336.9652d {+22h 27m 51.6s} (current),
                 336.4280d {+22h 25m 42.7s} (1950)
GRB_DEC:         +64.6933d {+64d 41' 35.8"} (J2000),
                 +64.7739d {+64d 46' 26.2"} (current),
                 +64.4377d {+64d 26' 15.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       63 [cnts]
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66715.68 SOD {18:31:55.68} UT,   138.9 [sec] since BAT Trigger Time
CENTROID_X:      298.59,  raw= 299  [pixels]
CENTROID_Y:      267.78,  raw= 268  [pixels]
ROLL:            325.77 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -70.75
GRB_POS_XRT_Z:   -15.81
IMAGE_URL:       sw00657321000msxps_rw.img
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 35"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.72d {+03h 50m 52s}  +15.63d {+15d 37' 46"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.29,  6.00 [deg] galactic lon,lat of the burst
ECL_COORDS:       27.59, 63.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:32:43 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.8363d {+22h 27m 20.7s} (J2000),
                 336.9652d {+22h 27m 51.6s} (current),
                 336.4280d {+22h 25m 42.7s} (1950)
GRB_DEC:         +64.6933d {+64d 41' 35.8"} (J2000),
                 +64.7739d {+64d 46' 26.2"} (current),
                 +64.4377d {+64d 26' 15.8"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       63 [cnts]
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66715.68 SOD {18:31:55.68} UT,   138.9 [sec] since BAT Trigger Time
CENTROID_X:      298.59,  raw= 299  [pixels]
CENTROID_Y:      267.78,  raw= 268  [pixels]
ROLL:            325.77 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -70.75
GRB_POS_XRT_Z:   -15.81
IMAGE_URL:       sw00657321000msxps_rw.img
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 35"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.72d {+03h 50m 53s}  +15.63d {+15d 37' 46"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.29,  6.00 [deg] galactic lon,lat of the burst
ECL_COORDS:       27.59, 63.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:33:34 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.845d {+22h 27m 23s} (J2000),
                 336.974d {+22h 27m 54s} (current),
                 336.436d {+22h 25m 45s} (1950)
GRB_DEC:         +64.661d {+64d 39' 39"} (J2000),
                 +64.741d {+64d 44' 29"} (current),
                 +64.405d {+64d 24' 18"} (1950)
GRB_DATE:        17296 TJD;   274 DOY;   15/10/01
GRB_TIME:        66576.78 SOD {18:29:36.78} UT
TRIGGER_INDEX:   20000
GRB_PHI:         123.13 [deg]
GRB_THETA:        33.14 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.40 [sigma]
LC_URL:          sw00657321000msb.lc
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 36"}
SUN_DIST:        114.73 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.73d {+03h 50m 55s}  +15.63d {+15d 37' 51"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.28,  5.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       27.53, 63.66 [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 = 349.21,20.17 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:35:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.803d {+22h 27m 13s} (J2000)
POINT_DEC:       +64.678d {+64d 40' 40"} (J2000)
POINT_ROLL:      325.767d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66725.03 SOD {18:32:05.03} UT,   148.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.553
N_STARS:         91
X_OFFSET:        320 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00657321000msufc0148.fits
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 37"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.74d {+03h 50m 59s}  +15.63d {+15d 38' 01"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  5.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.54, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:35:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.803d {+22h 27m 13s} (J2000)
POINT_DEC:       +64.678d {+64d 40' 40"} (J2000)
POINT_ROLL:      325.767d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66725.03 SOD {18:32:05.03} UT,   148.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.553
N_STARS:         91
X_OFFSET:        320 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1279 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00657321000msufc0148.fits
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 38"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.75d {+03h 51m 00s}  +15.63d {+15d 38' 04"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  5.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.54, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:36:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.803d {+22h 27m 13s} (J2000)
POINT_DEC:       +64.678d {+64d 40' 40"} (J2000)
ROLL:            325.767d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66725.03 SOD {18:32:05.03} UT,   148.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     465417140
X_OFFSET:        877 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0164.fits
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 39"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.76d {+03h 51m 02s}  +15.64d {+15d 38' 10"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  5.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.54, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:36:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.803d {+22h 27m 13s} (J2000)
POINT_DEC:       +64.678d {+64d 40' 40"} (J2000)
ROLL:            325.767d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66725.03 SOD {18:32:05.03} UT,   148.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     465417140
X_OFFSET:        877 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0164.fits
SUN_POSTN:       187.59d {+12h 30m 22s}   -3.28d {-03d 16' 39"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.76d {+03h 51m 03s}  +15.64d {+15d 38' 11"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  5.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.54, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:42:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.807d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
POINT_ROLL:      325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66884.02 SOD {18:34:44.02} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.747
N_STARS:         23
X_OFFSET:        557 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1516 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00657321000msufc0307.fits
SUN_POSTN:       187.60d {+12h 30m 23s}   -3.28d {-03d 16' 45"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.82d {+03h 51m 17s}  +15.65d {+15d 38' 44"}
MOON_DIST:        72.00 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:42:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.807d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
POINT_ROLL:      325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66884.02 SOD {18:34:44.02} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.747
N_STARS:         23
X_OFFSET:        557 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1516 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00657321000msufc0307.fits
SUN_POSTN:       187.60d {+12h 30m 23s}   -3.28d {-03d 16' 45"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.82d {+03h 51m 18s}  +15.65d {+15d 38' 46"}
MOON_DIST:        72.00 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:43:13 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     657321,   Seg_Num: 0
GRB_RA:          336.8383d {+22h 27m 21.19s} (J2000),
                 336.9672d {+22h 27m 52.13s} (current),
                 336.4300d {+22h 25m 43.19s} (1950)
GRB_DEC:         +64.6937d {+64d 41' 37.3"} (J2000),
                 +64.7744d {+64d 46' 27.6"} (current),
                 +64.4381d {+64d 26' 17.2"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66855.00 SOD {18:34:15.00} UT,   278.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       187.60d {+12h 30m 23s}   -3.28d {-03d 16' 45"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.83d {+03h 51m 18s}  +15.65d {+15d 38' 48"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.29,  6.00 [deg] galactic lon,lat of the burst
ECL_COORDS:       27.59, 63.68 [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:     Thu 01 Oct 15 18:44:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.807d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
ROLL:            325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66884.02 SOD {18:34:44.02} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     465417299
X_OFFSET:        877 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0323.fits
SUN_POSTN:       187.60d {+12h 30m 23s}   -3.28d {-03d 16' 46"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.83d {+03h 51m 20s}  +15.65d {+15d 38' 52"}
MOON_DIST:        72.01 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:44:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.807d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
ROLL:            325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  66884.02 SOD {18:34:44.02} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     465417299
X_OFFSET:        877 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0323.fits
SUN_POSTN:       187.60d {+12h 30m 23s}   -3.28d {-03d 16' 46"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.84d {+03h 51m 21s}  +15.65d {+15d 38' 55"}
MOON_DIST:        72.01 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:48:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.806d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
POINT_ROLL:      325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  67437.65 SOD {18:43:57.65} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.337
N_STARS:         190
X_OFFSET:        317 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1756 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00657321000msufc0860.fits
SUN_POSTN:       187.60d {+12h 30m 24s}   -3.28d {-03d 16' 51"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.88d {+03h 51m 32s}  +15.66d {+15d 39' 21"}
MOON_DIST:        72.02 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #18374
H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), C. Pagani (U Leicester), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 18:29:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151001B (trigger=657321). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 336.845, +64.661, which is
```
   RA(J2000)  =  22h 27m 23s
   Dec(J2000) = +64d 39' 39"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers, there is nothing significant in the real-time TDRSS light curve.
The XRT began observing the field at 18:31:55.6 UT, 138.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 336.8384, 64.6937 which is equivalent to:
```
   RA(J2000)  = 22h 27m 21.22s
   Dec(J2000) = +64d 41' 37.4"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 118 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (6.51 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 6.8 (+6.23/-4.70) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.89e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 148 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 1.71.
Burst Advocate for this burst is H. A. Krimm (hans.krimm AT 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:     Thu 01 Oct 15 18:49:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.806d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
POINT_ROLL:      325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  67437.65 SOD {18:43:57.65} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.337
N_STARS:         190
X_OFFSET:        317 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1756 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00657321000msufc0860.fits
SUN_POSTN:       187.60d {+12h 30m 24s}   -3.28d {-03d 16' 51"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.89d {+03h 51m 33s}  +15.66d {+15d 39' 23"}
MOON_DIST:        72.02 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:50:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.806d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
ROLL:            325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  67437.65 SOD {18:43:57.65} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     465417852
X_OFFSET:        876 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0876.fits
SUN_POSTN:       187.60d {+12h 30m 24s}   -3.28d {-03d 16' 52"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.90d {+03h 51m 36s}  +15.66d {+15d 39' 30"}
MOON_DIST:        72.02 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Oct 15 18:50:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     657321,   Seg_Num: 0
POINT_RA:        336.806d {+22h 27m 14s} (J2000)
POINT_DEC:       +64.681d {+64d 40' 51"} (J2000)
ROLL:            325.771d
IMG_START_DATE:  17296 TJD;   274 DOY;   15/10/01
IMG_START_TIME:  67437.65 SOD {18:43:57.65} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     465417852
X_OFFSET:        876 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw00657321000msuni0876.fits
SUN_POSTN:       187.60d {+12h 30m 24s}   -3.28d {-03d 16' 52"}
SUN_DIST:        114.70 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:       57.90d {+03h 51m 37s}  +15.66d {+15d 39' 31"}
MOON_DIST:        72.03 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      108.27,  6.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       27.55, 63.68 [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 #18377
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1574 s of XRT Photon Counting mode data and 2 UVOT images for GRB 151001B, 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 = 336.83909, +64.69375 which is equivalent to:
```
RA (J2000): 22h 27m 21.38s
Dec (J2000): +64d 41' 37.5"
```
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 #18380
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
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)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB151001B 20 sec after notice time and 96 sec after trigger time at 2015-10-01 18:31:13 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT error-box (Krimm et. al GCN 18374). The 5-sigma upper limit has been about 18.0 mag The message may be cited.
GCN Circular #18382
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), 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), (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlinks, we report further analysis of BAT GRB 151001B (trigger #657321) (Krimm, et al., GCN Circ. 18374). The BAT ground-calculated position is RA, Dec = 336.974, 64.637 deg, which is
```
   RA(J2000)  =  22h 27m 53.7s 
   Dec(J2000) = +64d 38' 13.5" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%.
The mask-weighted light curves shows several overlapping peaks starting at ~T-40 sec, peaking at ~T+50 sec, and ending at ~T+150 sec. T90 (15-350 keV) is 109 +- 17 sec (estimated error including systematics).
The time-averaged spectrum from T-23.3 to T+97 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.12 +- 0.27. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+47.47 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.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/657321/BA/
GCN Circular #18383
T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA) and H.A. Krimm report on behalf of the Swift-XRT team:
We have analysed 6.4 ks of XRT data for GRB 151001B (Krimm et al. GCN Circ. 18374), from 129 s to 59.3 ks after the BAT trigger. The data comprise 132 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 Evans et al. (GCN Circ. 18377).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.38 (+/-0.08), followed by a break at T+963 s to an alpha of 1.12 (+0.12, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.78 (+0.17, -0.16). The best-fitting absorption column is 1.09 (+0.19, -0.18) x 10^22 cm^-2, in excess of the Galactic value of 6.5 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.20 (+0.31, -0.30) and a best-fitting absorption column of 1.9 (+0.5, -0.4) x 10^22 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.4 x 10^-11 (1.4 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.9 (+0.5, -0.4) x 10^22 cm^-2
Galactic foreground: 6.5 x 10^21 cm^-2
Excess significance: 5.2 sigma
Photon index:	     2.20 (+0.31, -0.30)
```
If the light curve continues to decay with a power-law decay index of 1.12, the count rate at T+24 hours will be 2.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-13 (2.8 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00657321.
This circular is an official product of the Swift-XRT team.
GCN Circular #18384
A. A. Breeveld (UCL-MSSL) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151001B 148 s after the BAT trigger (Krimm et al., GCN Circ. 18374). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 18377) 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           148          298          147         >20.6
white              148         6765          805         >21.8
u_FC               307          557          246         >19.9
v                  636         7175          529         >20.2
b                  563         6561          333         >20.9
u                  307        11107          685         >20.7
w1                 686         7585          510         >20.2
m2                 661         7380          529         >20.2
w2                 613         6970          529         >20.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.71 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #18401
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report:
At ~16 minutes before the Swift-BAT trigger on GRB 151001B (Krimm, et al., GCN Circ. 18374; T0(BAT)=18:29:36 UT) Konus-Wind detected, in the waiting mode, a burst of high X-ray/soft gamma-ray emission which had a duration of ~191 s.
Taking into account the proximity of this burst to the Swift-BAT trigger and consistency of the KW ecliptic latitude response with the position of GRB 151001B we suggest this burst is the main part of GRB 151001B.
The K-W light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB151001B/ The count rate increase in the soft KW energy band, which follows the burst from T0(BAT)-838 s to T0(BAT)+2488 s, can not be unambiguously attributed to GRB 151001B.
As observed by Konus-Wind, the burst had a fluence of 8.5(-2.3,+0.6)x10^-6 erg/cm2 and a 2.944-s peak flux, measured from ~T0(BAT)-1007.1 s, of 1.8(-0.6,+0.4)x10^-7 erg/cm2/s (both in the 20 - 1000 keV energy range).
Modeling the K-W 3-channel time-integrated spectrum (from T0(BAT)-1018.9 s to T0(BAT)-827.5 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.9(-0.3,+0.5) and Ep = 179 (-52,+75) keV.
All the quoted errors are at 1 sigma confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 06-Oct-2015 [Disclaimer]