Gamma-ray Burst 170115A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 20:51:03 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     733103,   Seg_Num: 0
GRB_RA:          332.154d {+22h 08m 37s} (J2000),
                 332.362d {+22h 09m 27s} (current),
                 331.545d {+22h 06m 11s} (1950)
GRB_DEC:         +13.781d {+13d 46' 51"} (J2000),
                 +13.865d {+13d 51' 53"} (current),
                 +13.535d {+13d 32' 07"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       26010 [cnts]    Image_Peak=455 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   343     E_range: 50-350 keV
BKG_INTEN:       186406 [cnts]
BKG_TIME:        74917.53 SOD {20:48:37.53} UT
BKG_DUR:         64 [sec]
GRB_DATE:        17768 TJD;    15 DOY;   17/01/15
GRB_TIME:        75008.09 SOD {20:50:08.09} UT
GRB_PHI:         -19.15 [deg]
GRB_THETA:         6.14 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.60 [sigma]
IMAGE_SIGNIF:    7.53 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +3  -2  +0  +0 -66  +0 
SUN_POSTN:       297.90d {+19h 51m 35s}  -20.96d {-20d 57' 44"}
SUN_DIST:         48.57 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.19d {+10h 44m 46s}   +8.51d {+08d 30' 36"}
MOON_DIST:       155.97 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.78,-33.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      339.48, 23.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 257.23,-9.46 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 20:52:19 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     733103,   Seg_Num: 0
GRB_RA:          332.1390d {+22h 08m 33.36s} (J2000),
                 332.3465d {+22h 09m 23.16s} (current),
                 331.5303d {+22h 06m 07.26s} (1950)
GRB_DEC:         +13.7283d {+13d 43' 41.8"} (J2000),
                 +13.8123d {+13d 48' 44.1"} (current),
                 +13.4829d {+13d 28' 58.3"} (1950)
GRB_ERROR:       6.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.14e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.79 [sigma]
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75099.59 SOD {20:51:39.59} UT,   91.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.66 237.21 261.59 243.56
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       297.90d {+19h 51m 36s}  -20.96d {-20d 57' 44"}
SUN_DIST:         48.52 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.20d {+10h 44m 49s}   +8.51d {+08d 30' 23"}
MOON_DIST:       156.01 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.73,-33.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      339.44, 23.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 3.27 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 20:52:29 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     733103,   Seg_Num: 0
GRB_RA:          332.1390d {+22h 08m 33.3s} (J2000),
                 332.3465d {+22h 09m 23.1s} (current),
                 331.5303d {+22h 06m 07.2s} (1950)
GRB_DEC:         +13.7283d {+13d 43' 41.8"} (J2000),
                 +13.8123d {+13d 48' 44.1"} (current),
                 +13.4829d {+13d 28' 58.3"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75099.59 SOD {20:51:39.59} UT,   91.5 [sec] since BAT Trigger Time
CENTROID_X:      227.23,  raw= 227  [pixels]
CENTROID_Y:      326.50,  raw= 327  [pixels]
ROLL:            224.69 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   66.24
GRB_POS_XRT_Z:   -186.61
IMAGE_URL:       sw00733103000msxps_rw.img
SUN_POSTN:       297.90d {+19h 51m 36s}  -20.96d {-20d 57' 44"}
SUN_DIST:         48.52 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.21d {+10h 44m 49s}   +8.51d {+08d 30' 22"}
MOON_DIST:       156.01 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.73,-33.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      339.44, 23.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 20:52:38 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     733103,   Seg_Num: 0
GRB_RA:          332.1390d {+22h 08m 33.3s} (J2000),
                 332.3465d {+22h 09m 23.1s} (current),
                 331.5303d {+22h 06m 07.2s} (1950)
GRB_DEC:         +13.7283d {+13d 43' 41.8"} (J2000),
                 +13.8123d {+13d 48' 44.1"} (current),
                 +13.4829d {+13d 28' 58.3"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75099.59 SOD {20:51:39.59} UT,   91.5 [sec] since BAT Trigger Time
CENTROID_X:      227.23,  raw= 227  [pixels]
CENTROID_Y:      326.50,  raw= 327  [pixels]
ROLL:            224.69 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   66.24
GRB_POS_XRT_Z:   -186.61
IMAGE_URL:       sw00733103000msxps_rw.img
SUN_POSTN:       297.90d {+19h 51m 36s}  -20.96d {-20d 57' 43"}
SUN_DIST:         48.52 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.21d {+10h 44m 50s}   +8.51d {+08d 30' 20"}
MOON_DIST:       156.01 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.73,-33.16 [deg] galactic lon,lat of the burst
ECL_COORDS:      339.44, 23.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 20:56:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     733103,   Seg_Num: 0
GRB_RA:          332.154d {+22h 08m 37s} (J2000),
                 332.362d {+22h 09m 27s} (current),
                 331.545d {+22h 06m 11s} (1950)
GRB_DEC:         +13.781d {+13d 46' 51"} (J2000),
                 +13.865d {+13d 51' 53"} (current),
                 +13.535d {+13d 32' 07"} (1950)
GRB_DATE:        17768 TJD;    15 DOY;   17/01/15
GRB_TIME:        75008.09 SOD {20:50:08.09} UT
TRIGGER_INDEX:   343
GRB_PHI:         -19.15 [deg]
GRB_THETA:         6.14 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.60 [sigma]
IMAGE_SIGNIF:    7.53 [sigma]
LC_URL:          sw00733103000msb.lc
SUN_POSTN:       297.90d {+19h 51m 36s}  -20.96d {-20d 57' 42"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.24d {+10h 44m 57s}   +8.50d {+08d 29' 47"}
MOON_DIST:       155.97 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.78,-33.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      339.48, 23.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 257.23,-9.46 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 21:08:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.163d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 40"} (J2000)
POINT_ROLL:      224.695d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75107.84 SOD {20:51:47.84} UT,   99.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.938
N_STARS:         35
X_OFFSET:        544 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00733103000msufc0099.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 36"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.35d {+10h 45m 23s}   +8.46d {+08d 27' 49"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.48, 23.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 21:08:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.163d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 40"} (J2000)
POINT_ROLL:      224.695d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75107.84 SOD {20:51:47.84} UT,   99.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.938
N_STARS:         35
X_OFFSET:        544 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1503 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00733103000msufc0099.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 36"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.35d {+10h 45m 24s}   +8.46d {+08d 27' 45"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.48, 23.51 [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:     Sun 15 Jan 17 21:10:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.163d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 40"} (J2000)
ROLL:            224.695d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75107.84 SOD {20:51:47.84} UT,   99.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     506206326
X_OFFSET:        1070 [pixels]
Y_OFFSET:        581 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1230
Y_GRB_POS:       741
BINNING_INDEX:   1
IM_URL:          sw00733103000msuni0118.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 35"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.36d {+10h 45m 27s}   +8.46d {+08d 27' 30"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.48, 23.51 [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:     Sun 15 Jan 17 21:10:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.164d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 41"} (J2000)
POINT_ROLL:      224.693d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75267.57 SOD {20:54:27.57} UT,   259.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.373
N_STARS:         17
X_OFFSET:        750 [pixels]
Y_OFFSET:        261 [pixels]
X_MAX:           1709 [pixels]
Y_MAX:           1220 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00733103000msufc0259.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 35"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.37d {+10h 45m 28s}   +8.46d {+08d 27' 27"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.49, 23.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 21:10:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.163d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 40"} (J2000)
ROLL:            224.695d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75107.84 SOD {20:51:47.84} UT,   99.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     506206326
X_OFFSET:        1070 [pixels]
Y_OFFSET:        581 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1230
Y_GRB_POS:       741
BINNING_INDEX:   1
IM_URL:          sw00733103000msuni0118.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 35"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.37d {+10h 45m 29s}   +8.46d {+08d 27' 25"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.48, 23.51 [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:     Sun 15 Jan 17 21:10:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.164d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 41"} (J2000)
POINT_ROLL:      224.693d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75267.57 SOD {20:54:27.57} UT,   259.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.373
N_STARS:         17
X_OFFSET:        750 [pixels]
Y_OFFSET:        261 [pixels]
X_MAX:           1709 [pixels]
Y_MAX:           1220 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00733103000msufc0259.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 35"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.37d {+10h 45m 29s}   +8.46d {+08d 27' 24"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.49, 23.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jan 17 21:11:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.164d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 41"} (J2000)
ROLL:            224.693d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75267.57 SOD {20:54:27.57} UT,   259.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     506206486
X_OFFSET:        1070 [pixels]
Y_OFFSET:        581 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1230
Y_GRB_POS:       741
BINNING_INDEX:   1
IM_URL:          sw00733103000msuni0278.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 34"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.38d {+10h 45m 31s}   +8.45d {+08d 27' 15"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.49, 23.51 [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:     Sun 15 Jan 17 21:11:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     733103,   Seg_Num: 0
POINT_RA:        332.164d {+22h 08m 39s} (J2000)
POINT_DEC:       +13.778d {+13d 46' 41"} (J2000)
ROLL:            224.693d
IMG_START_DATE:  17768 TJD;    15 DOY;   17/01/15
IMG_START_TIME:  75267.57 SOD {20:54:27.57} UT,   259.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     506206486
X_OFFSET:        1070 [pixels]
Y_OFFSET:        581 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1230
Y_GRB_POS:       741
BINNING_INDEX:   1
IM_URL:          sw00733103000msuni0278.fits
SUN_POSTN:       297.91d {+19h 51m 39s}  -20.96d {-20d 57' 34"}
SUN_DIST:         48.56 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      161.38d {+10h 45m 31s}   +8.45d {+08d 27' 14"}
MOON_DIST:       155.96 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:       73.79,-33.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      339.49, 23.51 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #20462
K. L. Page (U Leicester), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), A. Cholden-Brown (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/NSF/USRA), F. E. Marshall (NASA/GSFC) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 20:50:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170115A (trigger=733103). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 332.154, +13.781 which is
```
   RA(J2000) = 22h 08m 37s
   Dec(J2000) = +13d 46' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve is only immediately available until T+8 seconds due to a telemetry gap, showing a rise to a maximum rate of ~800 counts/s at the end of that period.
The XRT began observing the field at 20:51:39.5 UT, 91.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 332.1390, 13.7283 which is equivalent to:
```
   RA(J2000)  = +22h 08m 33.36s
   Dec(J2000) = +13d 43' 41.9"
```
with an uncertainty of 6.3 arcseconds (radius, 90% containment). This location is 196 arcseconds from the BAT onboard position, outside 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 5.14e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 99 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 0.07.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.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 Circular #20465
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 615 s of XRT Photon Counting mode data and 1 UVOT images for GRB 170115A, 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 = 332.13844, +13.72836 which is equivalent to:
```
RA (J2000): 22h 08m 33.23s
Dec (J2000): +13d 43' 42.1"
```
with an uncertainty of 3.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #20470
K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
We have analysed 3.9 ks of XRT data for GRB 170115A, from 82 s to 40.4 ks after the BAT trigger. The data comprise 224 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.54 (+0.06, -0.05).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.22 (+0.17, -0.16). The best-fitting absorption column is 1.3 (+0.5, -0.4) x 10^21 cm^-2, in excess of the Galactic value of 6.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.9 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     1.3 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 6.1 x 10^20 cm^-2
Excess significance: 2.6 sigma
Photon index:	     2.22 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 1.54, the count rate at T+24 hours will be 4.1 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-14 (1.7 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/00733103.
This circular is an official product of the Swift-XRT team.
GCN Circular #20471
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), K. L. Page (U Leicester), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+450 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170115A (trigger #733103) (Page, et al., GCN Circ. 20462). The BAT ground-calculated position is RA, Dec = 332.145, 13.750 deg which is
```
RA(J2000) = 22h 08m 34.9s 
Dec(J2000) = +13d 45' 01.6" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single FRED-shaped peak, starting at T+0, peaking at around T+10 sec and decaying to background by around T+50 sec. The spacecraft entered the SAA at around T+400 seconds, so there is no data after this time. T90 (15-350 keV) is 48.0 +- 22.6 sec (estimated error including systematics).
The time-averaged spectrum from T-7.6 to T+40.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.45 +- 0.25. The fluence in the 15-150 keV band is 4.7 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+15.94 sec in the 15-150 keV band is 0.2 +- 0.1 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/733103/BA/
GCN Circular #20478
M. H. Siegel (PSU) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170115A 100 s after the BAT trigger (Page et al., GCN Circ. 20462). No optical afterglow consistent with the enhanced XRT position (Osborne et al. GCN Circ. 20465) 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)         100          250          147         >20.40
white             4804         6335          291         >20.66
v                 5214        35195          816         >19.67
b                 4599        40415          838         >20.68
u (fc)             260          328           67         >18.98
u                 5829         6029          196         >19.65
uvw1              5624         5824          196         >19.32
uvm2              5419         5619          196         >19.37
uvw2              5009        11435          992         >20.69
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #20479
E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), A. Volnova (IKI), V. Ayvazian (AbAO), O.Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 170115A (Page et al., GCN Circ. 20462) with AS-32 (0.7m) telescope of Abastumani Observatory on Jan., 16 (UT) 14:57:24. We obtained several unfiltered images of the field. No source is found within enhanced XRT position (Osborne et al. GCN Circ. 20465). Preliminary photometry of the field is following
```
Date        UT start   t-T0      Filter Exp.   OT    Err UpLim (3 sigma)
                       (mid, days)       (s)

2017-01-16  14:57:24   0.78450   CR     49*60  n/d   n/d 22.5
```
Photometry is based on nearby SDSS_DR9 stars SDSS_DR9_id R(Lupton)
```
J220832.66+134330.8 18.50
J220831.22+134259.5 18.59
J220831.94+134225.7 18.57
J220847.68+134539.9 16.60
J220833.30+133952.6 16.32
J220835.19+134539.0 17.66
J220837.56+134537.8 15.86
```
GCN Circular #20529
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 170115A (Page et al., GCN 20462) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Jan 16.42, Jan 17.59, Jan 18.67 and Jan 23.51 (UT) do not reveal any radio source at the XRT location (Osborne et al., GCN 20465), with 3sigma upper limits of 300 uJy, 78 uJy, 72 uJy and 81 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 26-Jan-2017 [Disclaimer]