Gamma-ray Burst 181202A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:37:01 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     874334,   Seg_Num: 0
GRB_RA:          280.745d {+18h 42m 59s} (J2000),
                 280.932d {+18h 43m 44s} (current),
                 280.249d {+18h 41m 00s} (1950)
GRB_DEC:         +27.951d {+27d 57' 03"} (J2000),
                 +27.971d {+27d 58' 15"} (current),
                 +27.900d {+27d 54' 01"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4724 [cnts]    Image_Peak=188 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   443     E_range: 15-50 keV
BKG_INTEN:       46684 [cnts]
BKG_TIME:        23753.98 SOD {06:35:53.98} UT
BKG_DUR:         24 [sec]
GRB_DATE:        18454 TJD;   336 DOY;   18/12/02
GRB_TIME:        23784.51 SOD {06:36:24.51} UT
GRB_PHI:         141.17 [deg]
GRB_THETA:        12.07 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.90 [sigma]
IMAGE_SIGNIF:    7.16 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  -3  +0  +0 -51  +0 
SUN_POSTN:       248.39d {+16h 33m 33s}  -21.95d {-21d 57' 00"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.20d {+12h 40m 48s}   +0.93d {+00d 55' 45"}
MOON_DIST:        90.21 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.43, 14.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.11, 50.83 [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 = 96.08,-20.27 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:38:26 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.755d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23869.86 SOD {06:37:49.86} UT,   85.4 [sec] since BAT Trigger Time
COUNTS:          3    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:40:29 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     874334,   Seg_Num: 0
GRB_RA:          280.745d {+18h 42m 59s} (J2000),
                 280.932d {+18h 43m 44s} (current),
                 280.249d {+18h 41m 00s} (1950)
GRB_DEC:         +27.951d {+27d 57' 03"} (J2000),
                 +27.971d {+27d 58' 15"} (current),
                 +27.900d {+27d 54' 01"} (1950)
GRB_DATE:        18454 TJD;   336 DOY;   18/12/02
GRB_TIME:        23784.51 SOD {06:36:24.51} UT
TRIGGER_INDEX:   443
GRB_PHI:         141.17 [deg]
GRB_THETA:        12.07 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.90 [sigma]
IMAGE_SIGNIF:    7.16 [sigma]
LC_URL:          sw00874334000msb.lc
SUN_POSTN:       248.39d {+16h 33m 34s}  -21.95d {-21d 57' 01"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.23d {+12h 40m 55s}   +0.92d {+00d 55' 02"}
MOON_DIST:        90.19 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.43, 14.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.11, 50.83 [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 = 96.08,-20.27 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:42:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.755d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
POINT_ROLL:      215.425d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23870.97 SOD {06:37:50.97} UT,   86.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.440
N_STARS:         190
X_OFFSET:        287 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1726 [pixels]
Y_MAX:           1763 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00874334000msufc0086.fits
SUN_POSTN:       248.39d {+16h 33m 34s}  -21.95d {-21d 57' 02"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.25d {+12h 40m 59s}   +0.91d {+00d 54' 35"}
MOON_DIST:        90.19 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.13, 50.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:42:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.755d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
POINT_ROLL:      215.425d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23870.97 SOD {06:37:50.97} UT,   86.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.440
N_STARS:         190
X_OFFSET:        287 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1726 [pixels]
Y_MAX:           1763 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00874334000msufc0086.fits
SUN_POSTN:       248.39d {+16h 33m 34s}  -21.95d {-21d 57' 02"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.25d {+12h 41m 00s}   +0.91d {+00d 54' 33"}
MOON_DIST:        90.19 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.13, 50.83 [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 02 Dec 18 06:42:26 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     874334,   Seg_Num: 0
GRB_RA:          280.7354d {+18h 42m 56.49s} (J2000),
                 280.9229d {+18h 43m 41.48s} (current),
                 280.2400d {+18h 40m 57.60s} (1950)
GRB_DEC:         +27.9589d {+27d 57' 32.0"} (J2000),
                 +27.9787d {+27d 58' 43.2"} (current),
                 +27.9082d {+27d 54' 29.6"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23903.00 SOD {06:38:23.00} UT,   118.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       248.39d {+16h 33m 34s}  -21.95d {-21d 57' 02"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.25d {+12h 40m 59s}   +0.91d {+00d 54' 38"}
MOON_DIST:        90.17 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.06 [deg] galactic lon,lat of the burst
ECL_COORDS:      285.10, 50.84 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:43:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.755d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
ROLL:            215.425d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23870.97 SOD {06:37:50.97} UT,   86.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565425492
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0109.fits
SUN_POSTN:       248.39d {+16h 33m 35s}  -21.95d {-21d 57' 02"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.26d {+12h 41m 02s}   +0.91d {+00d 54' 20"}
MOON_DIST:        90.18 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.13, 50.83 [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:     Sun 02 Dec 18 06:44:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.755d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
ROLL:            215.425d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23870.97 SOD {06:37:50.97} UT,   86.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565425492
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0109.fits
SUN_POSTN:       248.39d {+16h 33m 35s}  -21.95d {-21d 57' 02"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.26d {+12h 41m 03s}   +0.90d {+00d 54' 16"}
MOON_DIST:        90.18 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.13, 50.83 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:46:09 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     874334,   Seg_Num: 0
GRB_RA:          280.7348d {+18h 42m 56.35s} (J2000),
                 280.9223d {+18h 43m 41.34s} (current),
                 280.2394d {+18h 40m 57.46s} (1950)
GRB_DEC:         +27.9597d {+27d 57' 34.9"} (J2000),
                 +27.9795d {+27d 58' 46.1"} (current),
                 +27.9090d {+27d 54' 32.4"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         17.67 +/- 0.14 [mag]
FILTER:          7, U
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23867.00 SOD {06:37:47.00} UT,   82.5 [sec] since BAT Trigger Time
SUN_POSTN:       248.40d {+16h 33m 35s}  -21.95d {-21d 57' 03"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.28d {+12h 41m 07s}   +0.90d {+00d 53' 52"}
MOON_DIST:        90.15 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.10, 50.84 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:50:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.752d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 11"} (J2000)
POINT_ROLL:      215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24126.18 SOD {06:42:06.18} UT,   341.7 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        3.030
N_STARS:         190
X_OFFSET:        527 [pixels]
Y_OFFSET:        564 [pixels]
X_MAX:           1486 [pixels]
Y_MAX:           1523 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00874334000msufc0341.fits
SUN_POSTN:       248.40d {+16h 33m 36s}  -21.95d {-21d 57' 05"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.32d {+12h 41m 16s}   +0.88d {+00d 52' 60"}
MOON_DIST:        90.14 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:50:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.752d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 11"} (J2000)
POINT_ROLL:      215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24126.18 SOD {06:42:06.18} UT,   341.7 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        3.030
N_STARS:         190
X_OFFSET:        527 [pixels]
Y_OFFSET:        564 [pixels]
X_MAX:           1486 [pixels]
Y_MAX:           1523 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00874334000msufc0341.fits
SUN_POSTN:       248.40d {+16h 33m 36s}  -21.95d {-21d 57' 05"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.32d {+12h 41m 16s}   +0.88d {+00d 52' 56"}
MOON_DIST:        90.14 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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 02 Dec 18 06:52:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.752d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 11"} (J2000)
ROLL:            215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24126.18 SOD {06:42:06.18} UT,   341.7 [sec] since BAT Trigger Time
FILTER:          9, B
EXPOSURE_ID:     565425748
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0364.fits
SUN_POSTN:       248.40d {+16h 33m 36s}  -21.95d {-21d 57' 05"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.33d {+12h 41m 19s}   +0.88d {+00d 52' 38"}
MOON_DIST:        90.13 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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:     Sun 02 Dec 18 06:52:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.752d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 11"} (J2000)
ROLL:            215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24126.18 SOD {06:42:06.18} UT,   341.7 [sec] since BAT Trigger Time
FILTER:          9, B
EXPOSURE_ID:     565425748
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0364.fits
SUN_POSTN:       248.40d {+16h 33m 36s}  -21.95d {-21d 57' 05"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.33d {+12h 41m 20s}   +0.88d {+00d 52' 36"}
MOON_DIST:        90.13 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:51:16 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     874334,   Seg_Num: 0
GRB_RA:          280.7352d {+18h 42m 56.44s} (J2000),
                 280.9227d {+18h 43m 41.43s} (current),
                 280.2398d {+18h 40m 57.55s} (1950)
GRB_DEC:         +27.9590d {+27d 57' 32.3"} (J2000),
                 +27.9788d {+27d 58' 43.6"} (current),
                 +27.9083d {+27d 54' 29.9"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  23903.00 SOD {06:38:23.00} UT,   118.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       248.40d {+16h 33m 36s}  -21.95d {-21d 57' 05"}
SUN_DIST:         58.98 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.32d {+12h 41m 18s}   +0.88d {+00d 52' 48"}
MOON_DIST:        90.12 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.06 [deg] galactic lon,lat of the burst
ECL_COORDS:      285.10, 50.84 [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 Circular #23482
J. K. Cannizzo (NASA/UMBC), J.D. Gropp (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 06:36:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 181202A (trigger=874334). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 280.745, +27.951 which is
```
   RA(J2000) = 18h 42m 59s
   Dec(J2000) = +27d 57' 03"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 10 sec. The peak count rate was ~1100 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 06:37:49.8 UT, 85.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 280.73563, 27.95894 which is equivalent to:
```
   RA(J2000)  = 18h 42m 56.55s
   Dec(J2000) = +27d 57' 32.2"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 41 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.67 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 86 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	18:42:56.38 = 280.73490
  DEC(J2000) = +27:57:35.0  =  27.95973
```
with a 90%-confidence error radius of about 0.63 arc sec. This position is 3.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.67 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.14.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo 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:     Sun 02 Dec 18 06:57:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.753d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
POINT_ROLL:      215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24653.71 SOD {06:50:53.71} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.702
N_STARS:         190
X_OFFSET:        287 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1726 [pixels]
Y_MAX:           1763 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00874334000msufc0869.fits
SUN_POSTN:       248.40d {+16h 33m 37s}  -21.95d {-21d 57' 07"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.38d {+12h 41m 31s}   +0.86d {+00d 51' 31"}
MOON_DIST:        90.09 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 02 Dec 18 06:57:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.753d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
POINT_ROLL:      215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24653.71 SOD {06:50:53.71} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.702
N_STARS:         190
X_OFFSET:        287 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1726 [pixels]
Y_MAX:           1763 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00874334000msufc0869.fits
SUN_POSTN:       248.40d {+16h 33m 37s}  -21.95d {-21d 57' 07"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.38d {+12h 41m 31s}   +0.86d {+00d 51' 27"}
MOON_DIST:        90.09 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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 02 Dec 18 06:58:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.753d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
ROLL:            215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24653.71 SOD {06:50:53.71} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565426275
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0892.fits
SUN_POSTN:       248.41d {+16h 33m 37s}  -21.95d {-21d 57' 08"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.39d {+12h 41m 34s}   +0.85d {+00d 51' 13"}
MOON_DIST:        90.08 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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:     Sun 02 Dec 18 06:59:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874334,   Seg_Num: 0
POINT_RA:        280.753d {+18h 43m 01s} (J2000)
POINT_DEC:       +27.953d {+27d 57' 10"} (J2000)
ROLL:            215.422d
IMG_START_DATE:  18454 TJD;   336 DOY;   18/12/02
IMG_START_TIME:  24653.71 SOD {06:50:53.71} UT,   869.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565426275
X_OFFSET:        846 [pixels]
Y_OFFSET:        883 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1006
Y_GRB_POS:       1043
BINNING_INDEX:   1
IM_URL:          sw00874334000msuni0892.fits
SUN_POSTN:       248.41d {+16h 33m 37s}  -21.95d {-21d 57' 08"}
SUN_DIST:         58.99 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      190.39d {+12h 41m 34s}   +0.85d {+00d 51' 10"}
MOON_DIST:        90.08 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:       57.44, 14.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      285.12, 50.83 [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 #23483
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1454 s of XRT Photon Counting mode data and 1 UVOT images for GRB 181202A, 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 = 280.73491, +27.95964 which is equivalent to:
```
RA (J2000): 18h 42m 56.38s
Dec (J2000): +27d 57' 34.7"
```
with an uncertainty of 1.8 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 #23487
A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and J.K. Cannizzo report on behalf of the Swift-XRT team:
We have analysed 7.0 ks of XRT data for GRB 181202A (Cannizzo et al. GCN Circ. 23482), from 102 s to 29.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 23483).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.86 (+/-0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.69 (+0.22, -0.17). The best-fitting absorption column is 1.93 (+0.97, -0.26) x 10^21 cm^-2, consistent with the Galactic value of 1.7 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 (5.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.93 (+0.97, -0.26) x 10^21 cm^-2
Galactic foreground: 1.7 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.69 (+0.22, -0.17)
```
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 3.4 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x 10^-13 (1.8 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00874334.
This circular is an official product of the Swift-XRT team.
GCN Circular #23489
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 181202A (trigger #874334) (Cannizzo et al., GCN Circ. 23482). The BAT ground-calculated position is RA, Dec = 280.737, 27.976 deg which is
```
  RA(J2000)  =  18h 42m 56.9s
  Dec(J2000) = +27d 58' 33.4"
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a double-peaked structure that starts at ~T0 and ends at ~T+7 s. The two peaks occur at ~T+1 s and ~T+6 s, respectively. T90 (15-350 keV) is 6.56 +- 0.61 sec (estimated error including systematics).
The time-averaged spectrum from T-0.26 to T+6.76 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.61 +- 0.24. The fluence in the 15-150 keV band is 2.5 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.69 sec in the 15-150 keV band is 0.9 +- 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/874334/BA/
GCN Circular #23490
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory
MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 181202A (Cannizzo et al., GCN #23482) 13216 sec after trigger time at 2018-12-02 10:17:08. On best sum (1800s total exposure) set we haven`t found optical transient within Swift error-box (ra=280.733 dec=27.9592 r=0.05).
The 5-sigma upper limit has been about 19.0 mag
====================================================================
The galactic latitude b = 14 deg., longitude l = 58 deg. The observations made on zenit distance = 42 deg.The moon (25 % bright part) below the horizon (The altitude of the Moon is -26 deg. ). Observations started at twilight. The sun altitude is -10.6 deg. The object can be observed till sunrise at 2018-12-02 00:56:06
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB181202.28 32902 sec after trigger time at 2018-12-02 15:46:09 UT, with upper limit up to 20.2 mag. No OT detected.
The observations began at zenit distance = 57 deg. The sun altitude is -23.0 deg.
This message can be cited.
GCN Circular #23496
Alan M. Watson (UNAM), Nat Butler (ASU), 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), Jes�s Gonz�lez (UNAM), Carlos Rom�n-Z��iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 181202A (Cannizzo et al., GCN 23482) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron�mico Nacional on Sierra San Pedro M�rtir from 2018/12 3.09 to 2018/12 3.11 UTC (19.43 to 20.04 hours after the BAT trigger), obtaining a total of 0.09 hours exposure in the r and i bands and 0.12 hours exposure in the Z, Y, J, and H bands in poor conditions.
For a source within the Swift-XRT error circle, in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following 3-sigma upper limits:
```
 r	> 19.18
 i	> 19.17
 Z	> 16.52
 Y	> 16.30
 J	> 16.00
 H	> 16.31
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
However, we note that in our optimally-combined all-filter image, there appears to be a very faint source present in the Swift-XRT error circle. This suggests that there may be a source present at low significance in at least some of our individual images.
We thank the staff of the Observatorio Astron�mico Nacional in San Pedro M�rtir.
GCN Circular #23498
M. H. Siegel (PSU) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181202A 86 s after the BAT trigger (Cannizzo et al., GCN Circ. 23482). A source consistent with the XRT position (Evans et al. GCN Circ. 23483) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
  RA  (J2000) =  18:42:56.38 = 280.73491 (deg.)
  Dec (J2000) = +27:57:35.0  =  27.95971 (deg.)
```
with an estimated uncertainty of 0.47 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

v                  623         1540          117        >18.7
b                  342          591          246         19.57 +/- 0.18
u (fc)              86          336          246         17.67 +/- 0.07
w1                 672         1441           97        >19.6
m2                 647         1560          112        >22.2
w2                 598         1516          117        >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.14 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 04-Dec-2018 [Disclaimer]