Gamma-ray Burst 161108A

(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:     Tue 08 Nov 16 03:33:16 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.784d {+12h 03m 08s} (J2000),
                 180.999d {+12h 04m 00s} (current),
                 180.144d {+12h 00m 35s} (1950)
GRB_DEC:         +24.869d {+24d 52' 09"} (J2000),
                 +24.775d {+24d 46' 31"} (current),
                 +25.147d {+25d 08' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       11950 [cnts]    Image_Peak=324 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       101911 [cnts]
BKG_TIME:        12694.87 SOD {03:31:34.87} UT
BKG_DUR:         40 [sec]
GRB_DATE:        17700 TJD;   313 DOY;   16/11/08
GRB_TIME:        12753.17 SOD {03:32:33.17} UT
GRB_PHI:          54.43 [deg]
GRB_THETA:        12.34 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.58 [sigma]
IMAGE_SIGNIF:    7.76 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -2  +0  +0 -51  +0 
SUN_POSTN:       223.70d {+14h 54m 47s}  -16.67d {-16d 40' 17"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.90d {+21h 27m 36s}  -13.24d {-13d 14' 18"}
MOON_DIST:       141.43 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      221.99, 78.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      170.25, 23.00 [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 = 123.44,-5.48 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:34:25 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.7886d {+12h 03m 09.26s} (J2000),
                 181.0039d {+12h 04m 00.92s} (current),
                 180.1491d {+12h 00m 35.79s} (1950)
GRB_DEC:         +24.8692d {+24d 52' 09.1"} (J2000),
                 +24.7754d {+24d 46' 31.3"} (current),
                 +25.1476d {+25d 08' 51.3"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.63e-09 [erg/cm2/sec]
GRB_SIGNIF:      14.45 [sigma]
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12833.53 SOD {03:33:53.53} UT,   80.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.20 261.57 243.39
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       223.70d {+14h 54m 47s}  -16.67d {-16d 40' 18"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.91d {+21h 27m 39s}  -13.24d {-13d 14' 10"}
MOON_DIST:       141.44 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.00, 78.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      170.25, 23.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.26 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:34:36 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.7886d {+12h 03m 09.2s} (J2000),
                 181.0039d {+12h 04m 00.9s} (current),
                 180.1491d {+12h 00m 35.7s} (1950)
GRB_DEC:         +24.8692d {+24d 52' 09.1"} (J2000),
                 +24.7754d {+24d 46' 31.3"} (current),
                 +25.1476d {+25d 08' 51.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       209 [cnts]
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12833.53 SOD {03:33:53.53} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      320.09,  raw= 320  [pixels]
CENTROID_Y:      303.39,  raw= 303  [pixels]
ROLL:            130.41 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.19
GRB_POS_XRT_Z:   34.86
IMAGE_URL:       sw00721234000msxps_rw.img
SUN_POSTN:       223.70d {+14h 54m 47s}  -16.67d {-16d 40' 18"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.91d {+21h 27m 39s}  -13.24d {-13d 14' 08"}
MOON_DIST:       141.44 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.00, 78.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      170.25, 23.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:34:51 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.7886d {+12h 03m 09.2s} (J2000),
                 181.0039d {+12h 04m 00.9s} (current),
                 180.1491d {+12h 00m 35.7s} (1950)
GRB_DEC:         +24.8692d {+24d 52' 09.1"} (J2000),
                 +24.7754d {+24d 46' 31.3"} (current),
                 +25.1476d {+25d 08' 51.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       209 [cnts]
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12833.53 SOD {03:33:53.53} UT,   80.4 [sec] since BAT Trigger Time
CENTROID_X:      320.09,  raw= 320  [pixels]
CENTROID_Y:      303.39,  raw= 303  [pixels]
ROLL:            130.41 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.19
GRB_POS_XRT_Z:   34.86
IMAGE_URL:       sw00721234000msxps_rw.img
SUN_POSTN:       223.70d {+14h 54m 47s}  -16.67d {-16d 40' 18"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.92d {+21h 27m 40s}  -13.24d {-13d 14' 06"}
MOON_DIST:       141.44 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.00, 78.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      170.25, 23.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:36:21 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.784d {+12h 03m 08s} (J2000),
                 180.999d {+12h 04m 00s} (current),
                 180.144d {+12h 00m 35s} (1950)
GRB_DEC:         +24.869d {+24d 52' 09"} (J2000),
                 +24.775d {+24d 46' 31"} (current),
                 +25.147d {+25d 08' 51"} (1950)
GRB_DATE:        17700 TJD;   313 DOY;   16/11/08
GRB_TIME:        12753.17 SOD {03:32:33.17} UT
TRIGGER_INDEX:   298
GRB_PHI:          54.43 [deg]
GRB_THETA:        12.34 [deg]
DELTA_TIME:      -70.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.58 [sigma]
IMAGE_SIGNIF:    7.76 [sigma]
LC_URL:          sw00721234000msb.lc
SUN_POSTN:       223.70d {+14h 54m 47s}  -16.67d {-16d 40' 19"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.93d {+21h 27m 43s}  -13.23d {-13d 13' 55"}
MOON_DIST:       141.46 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      221.99, 78.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      170.25, 23.00 [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 = 123.44,-5.48 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:38:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.794d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 35"} (J2000)
POINT_ROLL:      130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12844.06 SOD {03:34:04.06} UT,   90.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.076
N_STARS:         13
X_OFFSET:        399 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1358 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00721234000msufc0090.fits
SUN_POSTN:       223.70d {+14h 54m 48s}  -16.67d {-16d 40' 21"}
SUN_DIST:         58.72 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.95d {+21h 27m 47s}  -13.23d {-13d 13' 40"}
MOON_DIST:       141.46 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:38:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.794d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 35"} (J2000)
POINT_ROLL:      130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12844.06 SOD {03:34:04.06} UT,   90.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.076
N_STARS:         13
X_OFFSET:        399 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1358 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00721234000msufc0090.fits
SUN_POSTN:       223.70d {+14h 54m 48s}  -16.67d {-16d 40' 21"}
SUN_DIST:         58.72 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.95d {+21h 27m 48s}  -13.23d {-13d 13' 37"}
MOON_DIST:       141.47 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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:     Tue 08 Nov 16 03:40:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.794d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 35"} (J2000)
ROLL:            130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12844.06 SOD {03:34:04.06} UT,   90.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     500268861
X_OFFSET:        719 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00721234000msuni0108.fits
SUN_POSTN:       223.70d {+14h 54m 48s}  -16.67d {-16d 40' 23"}
SUN_DIST:         58.72 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.97d {+21h 27m 53s}  -13.22d {-13d 13' 22"}
MOON_DIST:       141.48 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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:     Tue 08 Nov 16 03:41:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.794d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 35"} (J2000)
ROLL:            130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  12844.06 SOD {03:34:04.06} UT,   90.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     500268861
X_OFFSET:        719 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00721234000msuni0108.fits
SUN_POSTN:       223.70d {+14h 54m 48s}  -16.67d {-16d 40' 23"}
SUN_DIST:         58.72 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      321.97d {+21h 27m 53s}  -13.22d {-13d 13' 19"}
MOON_DIST:       141.48 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:45:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.796d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 38"} (J2000)
POINT_ROLL:      130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  13002.68 SOD {03:36:42.68} UT,   249.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.638
N_STARS:         10
X_OFFSET:        399 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1358 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00721234000msufc0249.fits
SUN_POSTN:       223.70d {+14h 54m 49s}  -16.67d {-16d 40' 26"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      322.02d {+21h 28m 04s}  -13.21d {-13d 12' 44"}
MOON_DIST:       141.52 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Nov 16 03:46:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.796d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 38"} (J2000)
POINT_ROLL:      130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  13002.68 SOD {03:36:42.68} UT,   249.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.638
N_STARS:         10
X_OFFSET:        399 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1358 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00721234000msufc0249.fits
SUN_POSTN:       223.70d {+14h 54m 49s}  -16.67d {-16d 40' 26"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      322.02d {+21h 28m 04s}  -13.21d {-13d 12' 42"}
MOON_DIST:       141.52 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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:     Tue 08 Nov 16 03:47:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.796d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 38"} (J2000)
ROLL:            130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  13002.68 SOD {03:36:42.68} UT,   249.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     500269019
X_OFFSET:        719 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00721234000msuni0267.fits
SUN_POSTN:       223.70d {+14h 54m 49s}  -16.67d {-16d 40' 27"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      322.03d {+21h 28m 07s}  -13.21d {-13d 12' 33"}
MOON_DIST:       141.53 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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:     Tue 08 Nov 16 03:47:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     721234,   Seg_Num: 0
POINT_RA:        180.796d {+12h 03m 11s} (J2000)
POINT_DEC:       +24.860d {+24d 51' 38"} (J2000)
ROLL:            130.415d
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  13002.68 SOD {03:36:42.68} UT,   249.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     500269019
X_OFFSET:        719 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00721234000msuni0267.fits
SUN_POSTN:       223.70d {+14h 54m 49s}  -16.67d {-16d 40' 27"}
SUN_DIST:         58.73 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      322.03d {+21h 28m 07s}  -13.21d {-13d 12' 32"}
MOON_DIST:       141.53 [deg]
MOON_ILLUM:      54 [%]
GAL_COORDS:      222.05, 78.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      170.26, 23.00 [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 #20145
A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 03:32:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 161108A (trigger=721234). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 180.784, +24.869 which is
```
   RA(J2000) = 12h 03m 08s
   Dec(J2000) = +24d 52' 09"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 03:33:53.5 UT, 80.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 180.78748, 24.86801 which is equivalent to:
```
   RA(J2000)  = 12h 03m 09.00s
   Dec(J2000) = +24d 52' 04.8"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 11 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 1.79 x 10^20 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 8.63e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 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 0.02.
Burst Advocate for this burst is A. P. Beardmore (apb 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:     Tue 08 Nov 16 04:00:19 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     721234,   Seg_Num: 0
GRB_RA:          180.7875d {+12h 03m 08.99s} (J2000),
                 181.0028d {+12h 04m 00.66s} (current),
                 180.1480d {+12h 00m 35.52s} (1950)
GRB_DEC:         +24.8679d {+24d 52' 04.4"} (J2000),
                 +24.7741d {+24d 46' 26.7"} (current),
                 +25.1463d {+25d 08' 46.6"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17700 TJD;   313 DOY;   16/11/08
IMG_START_TIME:  13089.00 SOD {03:38:09.00} UT,   335.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       223.71d {+14h 54m 51s}  -16.68d {-16d 40' 37"}
SUN_DIST:         58.75 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      322.15d {+21h 28m 35s}  -13.18d {-13d 10' 54"}
MOON_DIST:       141.63 [deg]
MOON_ILLUM:      54 [%]
GAL_COORDS:      222.00, 78.92 [deg] galactic lon,lat of the burst
ECL_COORDS:      170.25, 23.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #20146
D. Malesani (DARK/NBI and DTU Space), A. de Ugarte Postigo (IAA-CSIC and DARK/NBI), A. Somero (UTU), E. Gafton (NOT, SU, OKC), S. Damsted (Univ. Helsinki), G. Erfanianfar (MPE), A. Finoguenov (Univ. Helsinki), C. Gibson (Univ. Helsinki), F. Kiefer (MPE), C. Kirkpatrick (Univ. Helsinki), M. Lumme (Univ. Helsinki), V. Oja (Univ. Helsinki), J. Rantakyla (Univ. Helsinki), I. Salmenpera (Univ. Helsinki), and M. Seppala (Univ. Helsinki), report on behalf of a larger collaboration:
We observed the field of GRB 161108A (Beardmore et al., GCN 20145) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC imager and spectrograph. Observations started on Nov 8.2132 UT (94.4 min after the GRB trigger) and were carried out in the r and z filters.
Within the currently available XRT position (Beardmore et al., GCN 20145), we detect a single object, at coordinates (J2000):
```
RA = 12:03:09.11
Dec = +24:52:04.9
```
This source has a magnitude r = 20.82 +- 0.05 AB, calibrated against nearby SDSS stars. The same object is visible in the SDSS archival images, at a significantly fainter magnitude r = 22.69 +- 0.20. It is classified as a galaxy with a photometric redshift of 0.50 +- 0.12. The most likely interpretation is that the object seen in the NOT images is the superposition of afterglow and host galaxy, so we consider the association with GRB 161108A secure.
GCN Circular #20147
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 3332 s of XRT Photon Counting mode data and 5 UVOT images for GRB 161108A, 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 = 180.78794, +24.86815 which is equivalent to:
```
RA (J2000): 12h 03m 9.11s
Dec (J2000): +24d 52' 05.3"
```
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 #20148
L.M. McCauley (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and A.P. Beardmore report on behalf of the Swift-XRT team:
We have analysed 6.5 ks of XRT data for GRB 161108A (Beardmore et al. GCN Circ. 20145), from 73 s to 27.1 ks after the BAT trigger. The data comprise 263 s in Windowed Timing (WT) mode (the first 6 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 Beardmore et al. (GCN Circ. 20147).Considering only the late-time light curve (from T0+4.5 ks), the source is fading with alpha >1.2.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.20 (+/-0.04). The best-fitting absorption column is 2.20 (+0.15, -0.14) x 10^21 cm^-2, in excess of the Galactic value of 1.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.09 (+0.24, -0.22) and a best-fitting absorption column of 1.5 (+0.7, -0.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.5 (+0.7, -0.6) x 10^21 cm^-2
Galactic foreground: 1.8 x 10^20 cm^-2
Excess significance: 3.7 sigma
Photon index:	     2.09 (+0.24, -0.22)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00721234.
This circular is an official product of the Swift-XRT team.
GCN Circular #20149
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 161108A (Beardmore, et al., GCN 20145) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2016/11 8.48 to 2016/11 8.54 UTC (7.87 to 9.34 hours after the BAT trigger), obtaining a total of 1.03 hours exposure in the r and i bands and 0.40 hours exposure in the Z, Y, J, and H bands.
The afterglow candidate reported by Malesani et al. (GCN 20146) is well detected. In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections and upper limits (3-sigma):
```
  r =3D 21.97 +/- 0.12
  i =3D 21.36 +/- 0.06
  Z =3D 20.88 +/- 0.11
  Y =3D 20.57 +/- 0.14
  J =3D 20.05 +/- 0.27
  H > 18.12
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source appears to have faded in r by about 1 magnitude as compared to Malesani et al. (GCN 20146).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #20150
A. de Ugarte Postigo (IAA-CSIC and DARK/NBI), D. Malesani (DARK/NBI and DTU Space), D.A. Perley (DARK/NBI), J.P.U. Fynbo (DARK/NBI), K.E. Heintz (Univ. of Iceland and DARK/NBI), A. Somero (UTU), E. Gafton (NOT, SU, OKC), S. Damsted (Univ. Helsinki), G. Erfanianfar (MPE), A. Finoguenov (Univ. Helsinki), C. Gibson (Univ. Helsinki), F. Kiefer (MPE), C. Kirkpatrick (Univ. Helsinki), M. Lumme (Univ. Helsinki), V. Oja (Univ. Helsinki), J. Rantakyla (Univ. Helsinki), I. Salmenpera (Univ. Helsinki), and M. Seppala (Univ. Helsinki), report on behalf of a larger collaboration:
Continuing with the observations of GRB 161108A (Beardmore et al., GCN 20145) reported by Malesani et al. (GCN 20146) we performed spectroscopy of the afterglow (see also Butler et al. GCN 20149) and host galaxy using the Nordic Optical Telescope (NOT) equipped with AlFOSC. The observation consisted of 2x1200s+1x600s exposures using grism 4, starting at 5:47 UT (2.25 hr after the burst).
The spectrum shows continuum from 3900 to 9300 AA, with a single emission line at 8048 AA, consistent with being due to the [O II] doublet at z=1.159. Additionally we detect low SNR absorption features consistent with Mg II, Mg I, and Fe II at the same redshift, which we identify as the redshift of the GRB.
GCN Circular #20151
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 161108A (trigger #721234) (Beardmore, et al., GCN Circ. 20145). The BAT ground-calculated position is RA, Dec = 180.776, 24.905 deg which is
```
  RA(J2000)  =  12h 03m 06.1s
  Dec(J2000) = +24d 54' 19.4"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~ T-5 s and ends at ~ T+ 130 s. The main peak occurs at ~T0. T90 (15-350 keV) is 105.1 +- 11.9 sec (estimated error including systematics).
The time-averaged spectrum from T-1.9 to T+126.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.17. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-1.80 sec in the 15-150 keV band is 0.6 +- 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/721234/BA/
GCN Circular #20153
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.) report:
We imaged the field of GRB 161108A detected by SWIFT (trigger 721234) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 449s after the GRB trigger The elevation of the field increased from 28 degrees above horizon and weather conditions were good.
We co-added a series of exposures but we did not detect the afterglow candidate of Malesani et al. (GCNC 20146). TAROT limiting magnitudes are:
```
t0+ 449s to t0+ 539s : Rlim = 18.5
t0+1271s to t0+1941s : Rlim = 19.5
t0+1952s to t0+3694s : Rlim = 19.5
t0+3705s to t0+6041s : Rlim = 19.5
```
Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN Circular #20159
M. H. Siegel (PSU) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161108A 90 s after the BAT trigger (Beardmore et al., GCN Circ. 20131). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 20147) or the NOT position (Malesani et al., GCN Cir., 20146) 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 initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white (fc)         90          239          147         >20.08
white              90         5617          344         >20.62
v                 578         6029          235         >18.61
b                5212         5412          196         >19.76
u                 248          498          245         >19.24
u                 248        10794          652         >19.88
uvw1              628         6439          412         >19.66
uvm2              603         6234          412         >19.89
uvw2              554         5823          235         >19.59
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #20160
E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 161108A (Beardmore et al., GCN 20145) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on Nov. 08 (UT) 23:06:16. Within enhanced XRT position (Beardmore et al., GCN 20147) we detected a source coinciding with the afterglow of GRB 161014A (Malesani et al., GCN 20146; Butler et al., GCN 20149). Preliminary photometry of the source is following
```
Date       UT start   t-T0   Filter   Exp.   OT   Err.  UL
                       (mid, days)     (s)
2016-11-08 23:06:16   0.83869  R      28*120 21.8 0.20  22.0
```
Our photometry of the afterglow might be affected by nearby galaxy mentioned in GCN 20149 (Malesani et al.)
Photometry is based on nearby SDSS-DR9 stars (Lupton transformations):
```
SDSS-DR9_id         R(Lupton)
J120315.88+245217.4 18.37
J120326.17+245228.7 18.71
J120318.05+245356.7 18.52
J120250.21+245354.3 18.35
J120258.81+245024.2 16.90
J120314.67+244944.0 17.06
J120321.43+244829.2 16.79
```
GCN Circular #20163
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 161108A (Beardmore et al., GCNC 20145) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2016-11-08 17:48:36 UT (~14.3 h after the burst). We could not detect the previously reported afterglow (Malesani et al., GCNC 20146; Butler et al., GCNC 20149) in all the three bands.
Three sigma upper limits of the OT are listed below. We used SDSS-DR8 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'    Rc     Ic
-----------------------------------------------------
0.63016    18:39:58    5940.0   >19.9  >19.6  >19.2
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #20167
E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 161108A (Beardmore et al., GCN 20145) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on Nov. 09 (UT) 22:52:14. Within enhanced XRT position (Beardmore et al., GCN 20147) we detected the afterglow of GRB 161014A (Malesani et al., GCN 20146; Butler et al., GCN 20149). Preliminary photometry of the afterglow is following
```
Date       UT start   t-T0   Filter   Exp.   OT   Err.  UL
                       (mid, days)     (s)
2016-11-09 22:52:14   1.83762  R      41*120 22.0 0.24  22.2
```
The photometry of the afterglow might be affected by nearby galaxy mentioned in GCN 20149 (Malesani et al.)
Photometry is based on nearby SDSS-DR9 stars (Mazaeva et al., GCN 20160).
GCN Circular #20200
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 161108A (Beardmore et al., GCN 20145) 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 Nov 08.19, Nov 09.40, Nov 12.35 and Nov 15.36 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 20147), with 3sigma upper limits of 378 uJy, 284 uJy, 190 uJy and 93 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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