Gamma-ray Burst 181203A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:09:08 UT
NOTICE_TYPE:     Swift-BAT GRB Position   
TRIGGER_NUM:     874475,   Seg_Num: 0     
GRB_RA:          108.369d {+07h 13m 29s} (J2000),
                 108.528d {+07h 14m 07s} (current),
                 107.948d {+07h 11m 48s} (1950)    
GRB_DEC:         -39.769d {-39d 46' 07"} (J2000),  
                 -39.802d {-39d 48' 07"} (current),
                 -39.682d {-39d 40' 55"} (1950)                     
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2182 [cnts]    Image_Peak=145 [image_cnts]        
TRIGGER_DUR:     1.024 [sec]    
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       12160 [cnts]               
BKG_TIME:        43713.97 SOD {12:08:33.97} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18455 TJD;   337 DOY;   18/12/03
GRB_TIME:        43727.86 SOD {12:08:47.86} UT 
GRB_PHI:         156.97 [deg]                    
GRB_THETA:        21.64 [deg]                    
SOLN_STATUS:     0x3                             
RATE_SIGNIF:     14.83 [sigma]                   
IMAGE_SIGNIF:    8.24 [sigma]                    
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +0 +31  +0
SUN_POSTN:       249.72d {+16h 38m 53s}  -22.13d {-22d 07' 38"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.66d {+13h 42m 38s}   -5.10d {-05d 05' 55"} 
MOON_DIST:        92.18 [deg] 
MOON_ILLUM:      15 [%] 
GAL_COORDS:      251.17,-13.06 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      120.28,-61.29 [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 = 204.54,20.18 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:10:35 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     874475,   Seg_Num: 0
GRB_RA:          108.3454d {+07h 13m 22.8s} (J2000),
                 108.5045d {+07h 14m 01.0s} (current),
                 107.9250d {+07h 11m 42.0s} (1950)
GRB_DEC:         -39.8091d {-39d 48' 32.7"} (J2000),
                 -39.8424d {-39d 50' 32.6"} (current),
                 -39.7224d {-39d 43' 20.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43801.17 SOD {12:10:01.17} UT,   73.3 [sec] since BAT Trigger Time
CENTROID_X:      286.17,  raw= 286  [pixels]
CENTROID_Y:      242.88,  raw= 243  [pixels]
ROLL:            142.44 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -130.85
GRB_POS_XRT_Z:   -47.67
IMAGE_URL:       sw00874475000msxps_rw.img
SUN_POSTN:       249.72d {+16h 38m 54s}  -22.13d {-22d 07' 39"}
SUN_DIST:        108.25 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.67d {+13h 42m 41s}   -5.10d {-05d 06' 13"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.20,-13.10 [deg] galactic lon,lat of the burst
ECL_COORDS:      120.27,-61.33 [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:     Mon 03 Dec 18 12:10:40 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     874475,   Seg_Num: 0
GRB_RA:          108.3454d {+07h 13m 22.8s} (J2000),
                 108.5045d {+07h 14m 01.0s} (current),
                 107.9250d {+07h 11m 42.0s} (1950)
GRB_DEC:         -39.8091d {-39d 48' 32.7"} (J2000),
                 -39.8424d {-39d 50' 32.6"} (current),
                 -39.7224d {-39d 43' 20.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43801.17 SOD {12:10:01.17} UT,   73.3 [sec] since BAT Trigger Time
CENTROID_X:      286.17,  raw= 286  [pixels]
CENTROID_Y:      242.88,  raw= 243  [pixels]
ROLL:            142.44 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -130.85
GRB_POS_XRT_Z:   -47.67
IMAGE_URL:       sw00874475000msxps_rw.img
SUN_POSTN:       249.72d {+16h 38m 54s}  -22.13d {-22d 07' 39"}
SUN_DIST:        108.25 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.67d {+13h 42m 41s}   -5.10d {-05d 06' 14"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.20,-13.10 [deg] galactic lon,lat of the burst
ECL_COORDS:      120.27,-61.33 [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:     Mon 03 Dec 18 12:10:26 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     874475,   Seg_Num: 0
GRB_RA:          108.3454d {+07h 13m 22.89s} (J2000),
                 108.5045d {+07h 14m 01.07s} (current),
                 107.9250d {+07h 11m 42.01s} (1950)
GRB_DEC:         -39.8091d {-39d 48' 32.7"} (J2000),
                 -39.8424d {-39d 50' 32.6"} (current),
                 -39.7224d {-39d 43' 20.7"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.60e-09 [erg/cm2/sec]
GRB_SIGNIF:      6.00 [sigma]
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43801.17 SOD {12:10:01.17} UT,   73.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.17 261.71 243.59
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       249.72d {+16h 38m 54s}  -22.13d {-22d 07' 39"}
SUN_DIST:        108.25 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.67d {+13h 42m 41s}   -5.10d {-05d 06' 11"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.20,-13.10 [deg] galactic lon,lat of the burst
ECL_COORDS:      120.27,-61.33 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.63 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:     Mon 03 Dec 18 12:13:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.372d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.776d {-39d 46' 34"} (J2000)
POINT_ROLL:      142.442d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43807.16 SOD {12:10:07.16} UT,   79.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.537
N_STARS:         190
X_OFFSET:        408 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1367 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00874475000msufc0079.fits
SUN_POSTN:       249.73d {+16h 38m 54s}  -22.13d {-22d 07' 40"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.69d {+13h 42m 47s}   -5.11d {-05d 06' 44"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:13:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.372d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.776d {-39d 46' 34"} (J2000)
POINT_ROLL:      142.442d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43807.16 SOD {12:10:07.16} UT,   79.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.537
N_STARS:         190
X_OFFSET:        408 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1367 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00874475000msufc0079.fits
SUN_POSTN:       249.73d {+16h 38m 54s}  -22.13d {-22d 07' 40"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.70d {+13h 42m 47s}   -5.11d {-05d 06' 46"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:14:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.372d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.776d {-39d 46' 34"} (J2000)
ROLL:            142.442d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43807.16 SOD {12:10:07.16} UT,   79.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     565531829
X_OFFSET:        991 [pixels]
Y_OFFSET:        1041 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1151
Y_GRB_POS:       1201
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0102.fits
SUN_POSTN:       249.73d {+16h 38m 54s}  -22.13d {-22d 07' 40"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.71d {+13h 42m 50s}   -5.12d {-05d 07' 02"}
MOON_DIST:        92.20 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:14:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.372d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.776d {-39d 46' 34"} (J2000)
ROLL:            142.442d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43807.16 SOD {12:10:07.16} UT,   79.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     565531829
X_OFFSET:        991 [pixels]
Y_OFFSET:        1041 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1151
Y_GRB_POS:       1201
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0102.fits
SUN_POSTN:       249.73d {+16h 38m 54s}  -22.13d {-22d 07' 40"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.71d {+13h 42m 50s}   -5.12d {-05d 07' 04"}
MOON_DIST:        92.21 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.06 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:15:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     874475,   Seg_Num: 0
GRB_RA:          108.369d {+07h 13m 29s} (J2000),
                 108.528d {+07h 14m 07s} (current),
                 107.948d {+07h 11m 48s} (1950)
GRB_DEC:         -39.769d {-39d 46' 07"} (J2000),
                 -39.802d {-39d 48' 07"} (current),
                 -39.682d {-39d 40' 55"} (1950)
GRB_DATE:        18455 TJD;   337 DOY;   18/12/03
GRB_TIME:        43727.86 SOD {12:08:47.86} UT
TRIGGER_INDEX:   146
GRB_PHI:         156.97 [deg]
GRB_THETA:        21.64 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.83 [sigma]
IMAGE_SIGNIF:    8.24 [sigma]
LC_URL:          sw00874475000msb.lc
SUN_POSTN:       249.73d {+16h 38m 54s}  -22.13d {-22d 07' 40"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.71d {+13h 42m 50s}   -5.12d {-05d 07' 05"}
MOON_DIST:        92.21 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.17,-13.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.28,-61.29 [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 = 204.54,20.18 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:21:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
POINT_ROLL:      142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44021.17 SOD {12:13:41.17} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.053
N_STARS:         81
X_OFFSET:        671 [pixels]
Y_OFFSET:        721 [pixels]
X_MAX:           1630 [pixels]
Y_MAX:           1680 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00874475000msufc0293.fits
SUN_POSTN:       249.73d {+16h 38m 56s}  -22.13d {-22d 07' 43"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.77d {+13h 43m 05s}   -5.14d {-05d 08' 28"}
MOON_DIST:        92.24 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:22:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
POINT_ROLL:      142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44021.17 SOD {12:13:41.17} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.053
N_STARS:         81
X_OFFSET:        671 [pixels]
Y_OFFSET:        721 [pixels]
X_MAX:           1630 [pixels]
Y_MAX:           1680 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00874475000msufc0293.fits
SUN_POSTN:       249.73d {+16h 38m 56s}  -22.13d {-22d 07' 43"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.77d {+13h 43m 05s}   -5.14d {-05d 08' 31"}
MOON_DIST:        92.24 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:23:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
ROLL:            142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44021.17 SOD {12:13:41.17} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565532043
X_OFFSET:        991 [pixels]
Y_OFFSET:        1041 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1151
Y_GRB_POS:       1201
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0316.fits
SUN_POSTN:       249.73d {+16h 38m 56s}  -22.13d {-22d 07' 43"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.78d {+13h 43m 08s}   -5.15d {-05d 08' 46"}
MOON_DIST:        92.25 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:23:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
ROLL:            142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44021.17 SOD {12:13:41.17} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     565532043
X_OFFSET:        991 [pixels]
Y_OFFSET:        1041 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1151
Y_GRB_POS:       1201
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0316.fits
SUN_POSTN:       249.73d {+16h 38m 56s}  -22.13d {-22d 07' 43"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.79d {+13h 43m 08s}   -5.15d {-05d 08' 49"}
MOON_DIST:        92.25 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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 Circular #23493
E. Troja (NASA/GSFC/UMCP), A. P. Beardmore (U Leicester), A. A. Breeveld (UCL-MSSL), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (George Washington University), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 12:08:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 181203A (trigger=874475). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 108.369, -39.769 which is
```
   RA(J2000) = 07h 13m 29s
   Dec(J2000) = -39d 46' 07"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 20 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 12:10:01.1 UT, 73.3 seconds after the BAT trigger. The position determined from promptly downlinked data differs significantly from the on-board position, suggesting that the XRT may have centroided on a cosmic ray; the initial XRT position notice should be treated with caution. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 108.3491, -39.8016 which is equivalent to:
```
   RA(J2000)  = 07h 13m 23.78s
   Dec(J2000) = -39d 48' 05.6"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 129 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 2.26 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 79 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 0.24.
Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:22:33 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     874475,   Seg_Num: 0
GRB_RA:          108.3491d {+07h 13m 23.78s} (J2000),
                 108.5082d {+07h 14m 01.97s} (current),
                 107.9287d {+07h 11m 42.88s} (1950)
GRB_DEC:         -39.8016d {-39d 48' 05.7"} (J2000),
                 -39.8349d {-39d 50' 05.6"} (current),
                 -39.7149d {-39d 42' 53.7"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  43862.00 SOD {12:11:02.00} UT,   134.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       249.73d {+16h 38m 56s}  -22.13d {-22d 07' 43"}
SUN_DIST:        108.26 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.78d {+13h 43m 06s}   -5.14d {-05d 08' 35"}
MOON_DIST:        92.25 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.20,-13.09 [deg] galactic lon,lat of the burst
ECL_COORDS:      120.27,-61.33 [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:     Mon 03 Dec 18 12:28:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
POINT_ROLL:      142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44600.81 SOD {12:23:20.81} UT,   872.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.795
N_STARS:         190
X_OFFSET:        431 [pixels]
Y_OFFSET:        481 [pixels]
X_MAX:           1870 [pixels]
Y_MAX:           1920 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00874475000msufc0872.fits
SUN_POSTN:       249.74d {+16h 38m 57s}  -22.13d {-22d 07' 45"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.83d {+13h 43m 18s}   -5.16d {-05d 09' 46"}
MOON_DIST:        92.27 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Dec 18 12:28:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
POINT_ROLL:      142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44600.81 SOD {12:23:20.81} UT,   872.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.795
N_STARS:         190
X_OFFSET:        431 [pixels]
Y_OFFSET:        481 [pixels]
X_MAX:           1870 [pixels]
Y_MAX:           1920 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00874475000msufc0872.fits
SUN_POSTN:       249.74d {+16h 38m 57s}  -22.13d {-22d 07' 45"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.83d {+13h 43m 19s}   -5.16d {-05d 09' 50"}
MOON_DIST:        92.27 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:30:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
ROLL:            142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44600.81 SOD {12:23:20.81} UT,   872.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     565532622
X_OFFSET:        990 [pixels]
Y_OFFSET:        1040 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1150
Y_GRB_POS:       1200
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0895.fits
SUN_POSTN:       249.74d {+16h 38m 57s}  -22.13d {-22d 07' 46"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.84d {+13h 43m 22s}   -5.17d {-05d 10' 05"}
MOON_DIST:        92.27 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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:     Mon 03 Dec 18 12:30:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     874475,   Seg_Num: 0
POINT_RA:        108.370d {+07h 13m 29s} (J2000)
POINT_DEC:       -39.779d {-39d 46' 43"} (J2000)
ROLL:            142.445d
IMG_START_DATE:  18455 TJD;   337 DOY;   18/12/03
IMG_START_TIME:  44600.81 SOD {12:23:20.81} UT,   872.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     565532622
X_OFFSET:        990 [pixels]
Y_OFFSET:        1040 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1150
Y_GRB_POS:       1200
BINNING_INDEX:   1
IM_URL:          sw00874475000msuni0895.fits
SUN_POSTN:       249.74d {+16h 38m 57s}  -22.13d {-22d 07' 46"}
SUN_DIST:        108.27 [deg]   Sun_angle= 9.4 [hr] (West of Sun)
MOON_POSTN:      205.84d {+13h 43m 22s}   -5.17d {-05d 10' 08"}
MOON_DIST:        92.28 [deg]
MOON_ILLUM:      15 [%]
GAL_COORDS:      251.18,-13.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      120.29,-61.30 [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 #23494
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 867 s of XRT Photon Counting mode data and 1 UVOT images for GRB 181203A, 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 = 108.34857, -39.80187 which is equivalent to:
```
RA (J2000): 07h 13m 23.66s
Dec (J2000): -39d 48' 06.7"
```
with an uncertainty of 2.0 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 #23500
S. D. Barthelmy (GSFC), 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), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 181203A (trigger #874475) (Troja et al., GCN Circ. 23493). The BAT ground-calculated position is RA, Dec = 108.341, -39.783 deg which is
```
   RA(J2000)  =  07h 13m 21.8s
   Dec(J2000) = -39d 46' 57.1"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 83%.
The mask-weighted light curve shows a single-peaked structure that starts at ~T-2 s, peaks at ~T+1 s, and ends at ~T+16 s. T90 (15-350 keV) is 15.30 +- 1.75 sec (estimated error including systematics).
The time-averaged spectrum from T-1.96 to T+15.77 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.79 +- 0.15. The fluence in the 15-150 keV band is 7.8 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.02 sec in the 15-150 keV band is 1.1 +- 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/874475/BA/
GCN Circular #23502
A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Tohuvavohu (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 181203A (Troja et al. GCN Circ. 23493), from 60 s to 64.1 ks after the BAT trigger. The data comprise 9 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 23494).
The light curve can be modelled with a power-law decay with a decay index of alpha=2.74 (+0.27, -0.26).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.84 (+0.29, -0.17). The best-fitting absorption column is consistent with the Galactic value of 2.3 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 3.9 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.3 (+/-0.8) x 10^21 cm^-2
Galactic foreground: 2.3 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.84 (+0.29, -0.17)
```
If the light curve continues to decay with a power-law decay index of 2.74, the count rate at T+24 hours will be 3.2 x 10^-8 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-18 (1.6 x 10^-18) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00874475.
This circular is an official product of the Swift-XRT team.
GCN Circular #23505
F. E. Marshall (NASA/GSFC) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181203A 79 s after the BAT trigger (Troja et al., GCN Circ. 23493). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 23494) 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) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            79          229          147         >20.7
u_FC               293          543          246         >19.4
white               79         1370          373         >21.8
v                  624         1421           97         >18.6
b                  549         1346           78         >20.0
u                  293         1495          324         >19.7
w1                 673         1470           97         >19.0
m2                 648         1445           97         >18.5
w2                 599         1396           97         >19.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.24 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #23513
Y.-D. Hu, E. Fernandez-Garcia, A. Ayala and A. J. Castro-Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de Malaga), M. D. Caballero-Garcia (ASU-CAS, CZ) and R. Querel (NIWA), on behalf of a larger collaboration, report:
The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) automatically responded to the Swift trigger of GRB 181203A (Troja et al. GCNC 23493) ~0.51 h after the burst. At the position of the Swift/XRT enhanced X-ray position (Goad et al. GCNC 23494), no optical afterglow is detected down to 20.4 mag on a 360s co-added unfiltered image at 0.62 h (middle exposure) after trigger, in agreement with the non-detection by Swift/UVOT (Marshall et al. GCNC 23505).
We thank the staff at NIWA for its excellent support.
GCN Circular #23516
P. Schady (Univ. of Bath) and J. Bolmer (MPE, Garching) report:
We observed the field of GRB 181203A (Swift trigger 874475; Troja et al., GCN #23493) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 02:02 UT on 4th December, 13.4 hours after the GRB trigger. They were performed at an average seeing of 1.6" and at an average airmass of 1.4.
We found a faint source within the 2.0 arcsec Swift-XRT error circle reported by Goad et al. (GCN #23494) at
```
RA (J2000.0) = 07:13:23.705
DEC (J2000.0) = -39:48:05.29
```
with an uncertainty of 0.12" in each coordinate. The source is detected in all filters apart from the z' band, and has a preliminary r'-band AB magnitude of
r' = 23.5 +/- 0.1 mag
The above magnitude is calibrated against GROND zeropoints and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.21 in the direction of the burst (Schlafly & Finkbeiner 2011).
We thank Angela Hempel for the excellent support from La Silla.

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Jochen Greiner, last update: 07-Dec-2018 [Disclaimer]