Gamma-ray Burst 171216A

(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:     Sat 16 Dec 17 03:07:45 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          212.078d {+14h 08m 19s} (J2000),
                 212.372d {+14h 09m 29s} (current),
                 211.261d {+14h 05m 03s} (1950)
GRB_DEC:         -50.473d {-50d 28' 22"} (J2000),
                 -50.558d {-50d 33' 27"} (current),
                 -50.236d {-50d 14' 09"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7991 [cnts]    Image_Peak=231 [image_cnts]
TRIGGER_DUR:     3.072 [sec] 
TRIGGER_INDEX:   474     E_range: 25-100 keV
BKG_INTEN:       72094 [cnts]
BKG_TIME:        11171.83 SOD {03:06:11.83} UT
BKG_DUR:         32 [sec]
GRB_DATE:        18103 TJD;   350 DOY;   17/12/16
GRB_TIME:        11219.45 SOD {03:06:59.45} UT
GRB_PHI:         -43.36 [deg]
GRB_THETA:        29.35 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.04 [sigma]
IMAGE_SIGNIF:    7.36 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -3  +0  +0 -66  +0 
SUN_POSTN:       263.84d {+17h 35m 22s}  -23.32d {-23d 18' 55"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.86d {+15h 59m 25s}  -15.52d {-15d 31' 24"}
MOON_DIST:        41.43 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.84,-34.98 [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 = 86.57,-20.36 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:09:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          211.9905d {+14h 07m 57.71s} (J2000),
                 212.2851d {+14h 09m 08.43s} (current),
                 211.1740d {+14h 04m 41.74s} (1950)
GRB_DEC:         -50.4840d {-50d 29' 02.4"} (J2000),
                 -50.5687d {-50d 34' 07.1"} (current),
                 -50.2468d {-50d 14' 48.5"} (1950)
GRB_ERROR:       6.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.37e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.47 [sigma]
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11334.71 SOD {03:08:54.71} UT,   115.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.19 261.56 243.71
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       263.84d {+17h 35m 22s}  -23.32d {-23d 18' 55"}
SUN_DIST:         48.06 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.87d {+15h 59m 29s}  -15.53d {-15d 31' 35"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.18, 10.56 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.79,-35.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 3.39 arcmin from the BAT position.  
COMMENTS:        WARNING: The centroided position is more than 100 rows or columns from the center of the FOV.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:09:30 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          211.9905d {+14h 07m 57.7s} (J2000),
                 212.2851d {+14h 09m 08.4s} (current),
                 211.1740d {+14h 04m 41.7s} (1950)
GRB_DEC:         -50.4840d {-50d 29' 02.4"} (J2000),
                 -50.5687d {-50d 34' 07.1"} (current),
                 -50.2468d {-50d 14' 48.5"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11334.71 SOD {03:08:54.71} UT,   115.3 [sec] since BAT Trigger Time
CENTROID_X:      403.15,  raw= 403  [pixels]
CENTROID_Y:      324.62,  raw= 325  [pixels]
ROLL:            75.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.82
GRB_POS_XRT_Z:   228.07
IMAGE_URL:       sw00797441000msxps_rw.img
SUN_POSTN:       263.84d {+17h 35m 22s}  -23.32d {-23d 18' 55"}
SUN_DIST:         48.06 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.87d {+15h 59m 29s}  -15.53d {-15d 31' 36"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.18, 10.56 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.79,-35.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        WARNING: The centroided position is more than 100 rows or columns from the center of the FOV.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:09:32 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          211.9905d {+14h 07m 57.7s} (J2000),
                 212.2851d {+14h 09m 08.4s} (current),
                 211.1740d {+14h 04m 41.7s} (1950)
GRB_DEC:         -50.4840d {-50d 29' 02.4"} (J2000),
                 -50.5687d {-50d 34' 07.1"} (current),
                 -50.2468d {-50d 14' 48.5"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11334.71 SOD {03:08:54.71} UT,   115.3 [sec] since BAT Trigger Time
CENTROID_X:      403.15,  raw= 403  [pixels]
CENTROID_Y:      324.62,  raw= 325  [pixels]
ROLL:            75.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.82
GRB_POS_XRT_Z:   228.07
IMAGE_URL:       sw00797441000msxps_rw.img
SUN_POSTN:       263.84d {+17h 35m 22s}  -23.32d {-23d 18' 55"}
SUN_DIST:         48.06 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.87d {+15h 59m 29s}  -15.53d {-15d 31' 36"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.18, 10.56 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.79,-35.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:10:49 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          212.078d {+14h 08m 19s} (J2000),
                 212.372d {+14h 09m 29s} (current),
                 211.261d {+14h 05m 03s} (1950)
GRB_DEC:         -50.473d {-50d 28' 22"} (J2000),
                 -50.558d {-50d 33' 27"} (current),
                 -50.236d {-50d 14' 09"} (1950)
GRB_DATE:        18103 TJD;   350 DOY;   17/12/16
GRB_TIME:        11219.45 SOD {03:06:59.45} UT
TRIGGER_INDEX:   474
GRB_PHI:         -43.36 [deg]
GRB_THETA:        29.35 [deg]
DELTA_TIME:      39.00 [sec]
TRIGGER_DUR:     3.072 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.04 [sigma]
IMAGE_SIGNIF:    7.36 [sigma]
LC_URL:          sw00797441000msb.lc
SUN_POSTN:       263.84d {+17h 35m 22s}  -23.32d {-23d 18' 55"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.88d {+15h 59m 32s}  -15.53d {-15d 31' 45"}
MOON_DIST:        41.44 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.84,-34.98 [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 = 86.57,-20.36 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:17:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11343.28 SOD {03:09:03.28} UT,   123.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.801
N_STARS:         190
X_OFFSET:        392 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1351 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00797441000msufc0123.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.94d {+15h 59m 45s}  -15.54d {-15d 32' 30"}
MOON_DIST:        41.45 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:17:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11343.28 SOD {03:09:03.28} UT,   123.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.801
N_STARS:         190
X_OFFSET:        392 [pixels]
Y_OFFSET:        496 [pixels]
X_MAX:           1351 [pixels]
Y_MAX:           1455 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00797441000msufc0123.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.94d {+15h 59m 46s}  -15.54d {-15d 32' 32"}
MOON_DIST:        41.45 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:19:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11343.28 SOD {03:09:03.28} UT,   123.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     535086563
X_OFFSET:        344 [pixels]
Y_OFFSET:        992 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       504
Y_GRB_POS:       1152
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0144.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.96d {+15h 59m 49s}  -15.55d {-15d 32' 43"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:19:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11343.28 SOD {03:09:03.28} UT,   123.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     535086563
X_OFFSET:        344 [pixels]
Y_OFFSET:        992 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       504
Y_GRB_POS:       1152
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0144.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.96d {+15h 59m 50s}  -15.55d {-15d 32' 44"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:21:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11501.34 SOD {03:11:41.34} UT,   281.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.776
N_STARS:         160
X_OFFSET:        24 [pixels]
Y_OFFSET:        672 [pixels]
X_MAX:           983 [pixels]
Y_MAX:           1631 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00797441000msufc0281.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.97d {+15h 59m 53s}  -15.55d {-15d 32' 57"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:21:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11501.34 SOD {03:11:41.34} UT,   281.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.776
N_STARS:         160
X_OFFSET:        24 [pixels]
Y_OFFSET:        672 [pixels]
X_MAX:           983 [pixels]
Y_MAX:           1631 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00797441000msufc0281.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 56"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.97d {+15h 59m 54s}  -15.55d {-15d 32' 58"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:22:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11501.34 SOD {03:11:41.34} UT,   281.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     535086721
X_OFFSET:        344 [pixels]
Y_OFFSET:        992 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       504
Y_GRB_POS:       1152
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0302.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 57"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.98d {+15h 59m 55s}  -15.55d {-15d 33' 02"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:22:18 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     797441,   Seg_Num: 0
GRB_RA:          211.9924d {+14h 07m 58.17s} (J2000),
                 212.2871d {+14h 09m 08.89s} (current),
                 211.1758d {+14h 04m 42.20s} (1950)
GRB_DEC:         -50.4851d {-50d 29' 06.3"} (J2000),
                 -50.5697d {-50d 34' 11.0"} (current),
                 -50.2479d {-50d 14' 52.5"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11354.00 SOD {03:09:14.00} UT,   134.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 57"}
SUN_DIST:         48.06 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.98d {+15h 59m 55s}  -15.55d {-15d 33' 02"}
MOON_DIST:        41.51 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.18, 10.56 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.79,-35.01 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:22:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  11501.34 SOD {03:11:41.34} UT,   281.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     535086721
X_OFFSET:        344 [pixels]
Y_OFFSET:        992 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       504
Y_GRB_POS:       1152
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0302.fits
SUN_POSTN:       263.85d {+17h 35m 24s}  -23.32d {-23d 18' 57"}
SUN_DIST:         48.00 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      239.98d {+15h 59m 55s}  -15.55d {-15d 33' 03"}
MOON_DIST:        41.46 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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 #22256
F. E. Marshall (NASA/GSFC), J. R. Cummings (NASA/UMBC), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 03:06:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 171216A (trigger=797441). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 212.078, -50.473 which is
```
   RA(J2000) = 14h 08m 19s
   Dec(J2000) = -50d 28' 22"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of ~20 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 03:08:54.7 UT, 115.2 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 211.9924, -50.4851 which is equivalent to:
```
   RA(J2000)  = 14h 07m 58.17s
   Dec(J2000) = -50d 29' 06.3"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 200 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.84 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 5.37e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 123 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. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the expected extinction corresponding to E(B-V) of 0.26.
Burst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.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:     Sat 16 Dec 17 03:29:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  12079.84 SOD {03:21:19.84} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.285
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        432 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1871 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00797441000msufc0860.fits
SUN_POSTN:       263.86d {+17h 35m 26s}  -23.32d {-23d 18' 57"}
SUN_DIST:         48.01 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      240.04d {+16h 00m 10s}  -15.57d {-15d 33' 53"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 17 03:30:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
POINT_ROLL:      75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  12079.84 SOD {03:21:19.84} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.285
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        432 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1871 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00797441000msufc0860.fits
SUN_POSTN:       263.86d {+17h 35m 26s}  -23.32d {-23d 18' 57"}
SUN_DIST:         48.01 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      240.05d {+16h 00m 11s}  -15.57d {-15d 33' 55"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:31:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  12079.84 SOD {03:21:19.84} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     535087300
X_OFFSET:        559 [pixels]
Y_OFFSET:        991 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1151
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0881.fits
SUN_POSTN:       263.86d {+17h 35m 26s}  -23.32d {-23d 18' 58"}
SUN_DIST:         48.01 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      240.06d {+16h 00m 14s}  -15.57d {-15d 34' 04"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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:     Sat 16 Dec 17 03:31:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     797441,   Seg_Num: 0
POINT_RA:        212.092d {+14h 08m 22s} (J2000)
POINT_DEC:       -50.484d {-50d 29' 01"} (J2000)
ROLL:            75.511d
IMG_START_DATE:  18103 TJD;   350 DOY;   17/12/16
IMG_START_TIME:  12079.84 SOD {03:21:19.84} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     535087300
X_OFFSET:        559 [pixels]
Y_OFFSET:        991 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1151
BINNING_INDEX:   1
IM_URL:          sw00797441000msuni0881.fits
SUN_POSTN:       263.86d {+17h 35m 26s}  -23.32d {-23d 18' 58"}
SUN_DIST:         48.01 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      240.06d {+16h 00m 14s}  -15.57d {-15d 34' 05"}
MOON_DIST:        41.48 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:      315.24, 10.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.86,-34.98 [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 #22257
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 3440 s of XRT Photon Counting mode data and 7 UVOT images for GRB 171216A, 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 = 211.99069, -50.48474 which is equivalent to:
```
RA (J2000): 14h 07m 57.77s
Dec (J2000): -50d 29' 05.1"
```
with an uncertainty of 1.5 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 #22259
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), 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+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 171216A (trigger #797441) (Marshall et al., GCN Circ. 22256). The BAT ground-calculated position is RA, Dec = 212.013, -50.500 deg which is
```
  RA(J2000)  =  14h 08m 03.0s
  Dec(J2000) = -50d 30' 01.2"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 63%.
The mask-weighted light curve shows a weak single-peaked structure that starts at ~T0, peaks at ~T+3 s, and ends at ~ T+30 s. T90 (15-350 keV) is 30.0 +- 7.5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.45 to T+33.47 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.63 +- 0.30. The fluence in the 15-150 keV band is 4.8 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+3.05 sec in the 15-150 keV band is 0.8 +- 0.2 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/797441/BA/
GCN Circular #22260
P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester) and F.E. Marshall report on behalf of the Swift-XRT team:
We have analysed 8.0 ks of XRT data for GRB 171216A (Marshall et al. GCN Circ. 22256), from 134 s to 64.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 22257).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.9 (+0.6, -0.3), followed by a break at T+456 s to an alpha of 0.86 (+0.10, -0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.76 (+0.16, -0.09). The best-fitting absorption column is consistent with the Galactic value of 2.8 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.8 (+/-0.3) x 10^21 cm^-2
Galactic foreground: 2.8 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.76 (+0.16, -0.09)
```
If the light curve continues to decay with a power-law decay index of 0.86, the count rate at T+24 hours will be 4.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.1 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/00797441.
This circular is an official product of the Swift-XRT team.
GCN Circular #22262
F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171216A 124 s after the BAT trigger (Marshall et al., GCN Circ. 22256). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 22257) 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           124          274          147         >21.3
u_FC               282          532          246         >18.4
v                  613        17562          371         >17.8
b                  539         6997          359         >19.8
u                  282         6886          678         >18.6
w1                 662         6681          452         >19.3
m2                 637         6476          274         >19.3
w2                 588        12734          720         >20.1
```
These preliminary results may be affected by the presence of a bright source about 10" from the XRT position.
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.26 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 19-Dec-2017 [Disclaimer]