Gamma-ray Burst 191031C

(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:     Thu 31 Oct 19 18:44:08 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.862d {+07h 43m 27s} (J2000),
                 115.926d {+07h 43m 42s} (current),
                 115.698d {+07h 42m 48s} (1950)
GRB_DEC:         -62.335d {-62d 20' 04"} (J2000),
                 -62.383d {-62d 22' 58"} (current),
                 -62.214d {-62d 12' 48"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2889 [cnts]    Image_Peak=112 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       18661 [cnts]
BKG_TIME:        67416.15 SOD {18:43:36.15} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67434.90 SOD {18:43:54.90} UT
GRB_PHI:         -140.26 [deg]
GRB_THETA:        42.56 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     11.22 [sigma]
IMAGE_SIGNIF:    7.29 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 -14  +0 
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 24"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.27d {+17h 41m 05s}  -22.06d {-22d 03' 48"}
MOON_DIST:        92.11 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.51,-18.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.29,-78.18 [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 = 72.55,-7.72 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(38.0<100sec) coincident with the FERMI_GBM event (trignum=594240201).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:43:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     594240201
GRB_RA:          122.917d {+08h 11m 40s} (J2000),
                 123.043d {+08h 12m 10s} (current),
                 122.598d {+08h 10m 23s} (1950)
GRB_DEC:         -54.017d {-54d 01' 00"} (J2000),
                 -54.077d {-54d 04' 35"} (current),
                 -53.866d {-53d 51' 57"} (1950)
GRB_ERROR:       9.20 [deg radius, statistical plus systematic]
GRB_INTEN:       145 [cnts/sec]
DATA_SIGNIF:     8.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67396.71 SOD {18:43:16.71} UT
GRB_PHI:         285.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.34
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       1,0,0, 0,0,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 24"}
SUN_DIST:         80.08 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
MOON_POSTN:      265.27d {+17h 41m 04s}  -22.06d {-22d 03' 47"}
MOON_DIST:        97.21 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      268.73,-10.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      157.75,-69.82 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_lc_medres34_bn191031780.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 161.98,-25.05 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:44:35 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      90
TRIGGER_NUM:     594240201
GRB_RA:          116.483d {+07h 45m 56s} (J2000),
                 116.548d {+07h 46m 12s} (current),
                 116.319d {+07h 45m 16s} (1950)
GRB_DEC:         -62.400d {-62d 23' 59"} (J2000),
                 -62.449d {-62d 26' 56"} (current),
                 -62.276d {-62d 16' 33"} (1950)
GRB_ERROR:       6.28 [deg radius, statistical plus systematic]
GRB_INTEN:       277 [cnts/sec]
DATA_SIGNIF:     25.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67396.71 SOD {18:43:16.71} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.09
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       1,0,0, 0,0,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 25"}
SUN_DIST:         81.60 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      265.28d {+17h 41m 06s}  -22.06d {-22d 03' 50"}
MOON_DIST:        91.91 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.70,-17.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      172.30,-77.97 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_lc_medres34_bn191031780.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 161.98,-25.05 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(38.0<100sec) coincident with the SWIFT_BAT event (trignum=932595).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:44:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      87
TRIGGER_NUM:     594240201
GRB_RA:          116.317d {+07h 45m 16s} (J2000),
                 116.387d {+07h 45m 33s} (current),
                 116.139d {+07h 44m 33s} (1950)
GRB_DEC:         -61.733d {-61d 43' 59"} (J2000),
                 -61.782d {-61d 46' 55"} (current),
                 -61.610d {-61d 36' 36"} (1950)
GRB_ERROR:       6.38 [deg radius, statistical plus systematic]
GRB_INTEN:       264 [cnts/sec]
DATA_SIGNIF:     16.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67396.71 SOD {18:43:16.71} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.92
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,0,0, 0,0,0, 1,0,0, 0,0,0, 0,0,
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 25"}
SUN_DIST:         81.84 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      265.28d {+17h 41m 06s}  -22.06d {-22d 03' 50"}
MOON_DIST:        92.53 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.03,-17.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      169.44,-77.67 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_lc_medres34_bn191031780.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 161.98,-25.05 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(38.0<100sec) coincident with the SWIFT_BAT event (trignum=932595).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:52:35 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     594240201
GRB_RA:          120.850d {+08h 03m 24s} (J2000),
                 120.943d {+08h 03m 46s} (current),
                 120.616d {+08h 02m 28s} (1950)
GRB_DEC:         -59.580d {-59d 34' 47"} (J2000),
                 -59.637d {-59d 38' 11"} (current),
                 -59.438d {-59d 26' 15"} (1950)
GRB_ERROR:       1.63 [deg radius, statistical only]
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67396.71 SOD {18:43:16.71} UT
GRB_PHI:         277.00 [deg]
GRB_THETA:        19.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 31"}
SUN_DIST:         80.15 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      265.36d {+17h 41m 26s}  -22.07d {-22d 04' 22"}
MOON_DIST:        93.25 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      273.07,-14.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      167.87,-74.60 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_lc_medres34_bn191031780.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_locplot_all_bn191031780.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(38.0<100sec) coincident with the SWIFT_BAT event (trignum=932595).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:45:55 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.8682d {+07h 43m 28.3s} (J2000),
                 115.9327d {+07h 43m 43.8s} (current),
                 115.7044d {+07h 42m 49.0s} (1950)
GRB_DEC:         -62.3247d {-62d 19' 28.9"} (J2000),
                 -62.3729d {-62d 22' 22.5"} (current),
                 -62.2036d {-62d 12' 12.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       91 [cnts]
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67516.25 SOD {18:45:16.25} UT,   81.4 [sec] since BAT Trigger Time
CENTROID_X:      272.83,  raw= 273  [pixels]
CENTROID_Y:      315.07,  raw= 315  [pixels]
ROLL:            105.28 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   40.01
GRB_POS_XRT_Z:   -81.47
IMAGE_URL:       sw00932595000msxps_rw.img
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 26"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.29d {+17h 41m 10s}  -22.07d {-22d 03' 55"}
MOON_DIST:        92.11 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.50,-18.11 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.26,-78.17 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:45:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.8682d {+07h 43m 28.36s} (J2000),
                 115.9327d {+07h 43m 43.85s} (current),
                 115.7044d {+07h 42m 49.06s} (1950)
GRB_DEC:         -62.3247d {-62d 19' 28.9"} (J2000),
                 -62.3729d {-62d 22' 22.5"} (current),
                 -62.2036d {-62d 12' 12.9"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.60e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.53 [sigma]
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67516.25 SOD {18:45:16.25} UT,   81.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.14 261.75 243.75
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 26"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.29d {+17h 41m 09s}  -22.07d {-22d 03' 55"}
MOON_DIST:        92.11 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.50,-18.11 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.26,-78.17 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.62 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:45:51 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.8682d {+07h 43m 28.3s} (J2000),
                 115.9327d {+07h 43m 43.8s} (current),
                 115.7044d {+07h 42m 49.0s} (1950)
GRB_DEC:         -62.3247d {-62d 19' 28.9"} (J2000),
                 -62.3729d {-62d 22' 22.5"} (current),
                 -62.2036d {-62d 12' 12.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       91 [cnts]
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67516.25 SOD {18:45:16.25} UT,   81.4 [sec] since BAT Trigger Time
CENTROID_X:      272.83,  raw= 273  [pixels]
CENTROID_Y:      315.07,  raw= 315  [pixels]
ROLL:            105.28 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   40.01
GRB_POS_XRT_Z:   -81.47
IMAGE_URL:       sw00932595000msxps_rw.img
SUN_POSTN:       215.68d {+14h 22m 44s}  -14.19d {-14d 11' 26"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.29d {+17h 41m 09s}  -22.07d {-22d 03' 55"}
MOON_DIST:        92.11 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.50,-18.11 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.26,-78.17 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:47:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.862d {+07h 43m 27s} (J2000),
                 115.926d {+07h 43m 42s} (current),
                 115.698d {+07h 42m 48s} (1950)
GRB_DEC:         -62.335d {-62d 20' 04"} (J2000),
                 -62.383d {-62d 22' 58"} (current),
                 -62.214d {-62d 12' 48"} (1950)
GRB_DATE:        18787 TJD;   304 DOY;   19/10/31
GRB_TIME:        67434.90 SOD {18:43:54.90} UT
TRIGGER_INDEX:   148
GRB_PHI:         -140.26 [deg]
GRB_THETA:        42.56 [deg]
DELTA_TIME:      45.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.22 [sigma]
IMAGE_SIGNIF:    7.29 [sigma]
LC_URL:          sw00932595000msb.lc
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 27"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.31d {+17h 41m 14s}  -22.07d {-22d 04' 03"}
MOON_DIST:        92.11 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.51,-18.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.29,-78.18 [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 = 72.55,-7.72 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:48:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.815d {+07h 43m 16s} (J2000)
POINT_DEC:       -62.330d {-62d 19' 46"} (J2000)
POINT_ROLL:      105.277d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67524.98 SOD {18:45:24.98} UT,   90.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.190
N_STARS:         138
X_OFFSET:        616 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00932595000msufc0090.fits
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 28"}
SUN_DIST:         81.91 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.32d {+17h 41m 16s}  -22.07d {-22d 04' 05"}
MOON_DIST:        92.13 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 18:48:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.815d {+07h 43m 16s} (J2000)
POINT_DEC:       -62.330d {-62d 19' 46"} (J2000)
POINT_ROLL:      105.277d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67524.98 SOD {18:45:24.98} UT,   90.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.190
N_STARS:         138
X_OFFSET:        616 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00932595000msufc0090.fits
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 28"}
SUN_DIST:         81.91 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.32d {+17h 41m 16s}  -22.07d {-22d 04' 06"}
MOON_DIST:        92.13 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 18:49:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.815d {+07h 43m 16s} (J2000)
POINT_DEC:       -62.330d {-62d 19' 46"} (J2000)
ROLL:            105.277d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67524.98 SOD {18:45:24.98} UT,   90.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     594240348
X_OFFSET:        903 [pixels]
Y_OFFSET:        707 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1063
Y_GRB_POS:       867
BINNING_INDEX:   1
IM_URL:          sw00932595000msuni0114.fits
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 29"}
SUN_DIST:         81.91 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.33d {+17h 41m 19s}  -22.07d {-22d 04' 10"}
MOON_DIST:        92.13 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 18:49:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.815d {+07h 43m 16s} (J2000)
POINT_DEC:       -62.330d {-62d 19' 46"} (J2000)
ROLL:            105.277d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67524.98 SOD {18:45:24.98} UT,   90.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     594240348
X_OFFSET:        903 [pixels]
Y_OFFSET:        707 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1063
Y_GRB_POS:       867
BINNING_INDEX:   1
IM_URL:          sw00932595000msuni0114.fits
SUN_POSTN:       215.69d {+14h 22m 45s}  -14.19d {-14d 11' 29"}
SUN_DIST:         81.91 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.33d {+17h 41m 19s}  -22.07d {-22d 04' 11"}
MOON_DIST:        92.13 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 19:03:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.811d {+07h 43m 15s} (J2000)
POINT_DEC:       -62.331d {-62d 19' 51"} (J2000)
POINT_ROLL:      105.281d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  68294.39 SOD {18:58:14.39} UT
FILTER:          10, White
BKG_MEAN:        2.139
N_STARS:         190
X_OFFSET:        343 [pixels]
Y_OFFSET:        147 [pixels]
X_MAX:           1782 [pixels]
Y_MAX:           1586 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00932595000msufc594241094.fits
SUN_POSTN:       215.70d {+14h 22m 47s}  -14.19d {-14d 11' 40"}
SUN_DIST:         81.92 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.46d {+17h 41m 51s}  -22.08d {-22d 05' 04"}
MOON_DIST:        92.14 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 Oct 19 19:03:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.811d {+07h 43m 15s} (J2000)
POINT_DEC:       -62.331d {-62d 19' 51"} (J2000)
POINT_ROLL:      105.281d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  68294.39 SOD {18:58:14.39} UT
FILTER:          10, White
BKG_MEAN:        2.139
N_STARS:         190
X_OFFSET:        343 [pixels]
Y_OFFSET:        147 [pixels]
X_MAX:           1782 [pixels]
Y_MAX:           1586 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00932595000msufc594241094.fits
SUN_POSTN:       215.70d {+14h 22m 47s}  -14.19d {-14d 11' 40"}
SUN_DIST:         81.92 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.47d {+17h 41m 52s}  -22.09d {-22d 05' 05"}
MOON_DIST:        92.14 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 19:04:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.811d {+07h 43m 15s} (J2000)
POINT_DEC:       -62.331d {-62d 19' 51"} (J2000)
ROLL:            105.281d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  68294.39 SOD {18:58:14.39} UT
FILTER:          10, White
EXPOSURE_ID:     594241118
X_OFFSET:        902 [pixels]
Y_OFFSET:        706 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1062
Y_GRB_POS:       866
BINNING_INDEX:   1
IM_URL:          sw00932595000msuni594241118.fits
SUN_POSTN:       215.70d {+14h 22m 47s}  -14.20d {-14d 11' 41"}
SUN_DIST:         81.92 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.48d {+17h 41m 55s}  -22.09d {-22d 05' 09"}
MOON_DIST:        92.14 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 19:04:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     932595,   Seg_Num: 0
POINT_RA:        115.811d {+07h 43m 15s} (J2000)
POINT_DEC:       -62.331d {-62d 19' 51"} (J2000)
ROLL:            105.281d
IMG_START_DATE:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  68294.39 SOD {18:58:14.39} UT
FILTER:          10, White
EXPOSURE_ID:     594241118
X_OFFSET:        902 [pixels]
Y_OFFSET:        706 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1062
Y_GRB_POS:       866
BINNING_INDEX:   1
IM_URL:          sw00932595000msuni594241118.fits
SUN_POSTN:       215.70d {+14h 22m 47s}  -14.20d {-14d 11' 41"}
SUN_DIST:         81.92 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.48d {+17h 41m 55s}  -22.09d {-22d 05' 10"}
MOON_DIST:        92.14 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.49,-18.13 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.21,-78.19 [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:     Thu 31 Oct 19 19:04:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     932595,   Seg_Num: 0
GRB_RA:          115.8713d {+07h 43m 29.11s} (J2000),
                 115.9358d {+07h 43m 44.60s} (current),
                 115.7075d {+07h 42m 49.80s} (1950)
GRB_DEC:         -62.3250d {-62d 19' 30.0"} (J2000),
                 -62.3732d {-62d 22' 23.6"} (current),
                 -62.2039d {-62d 12' 13.9"} (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:  18787 TJD;   304 DOY;   19/10/31
IMG_START_TIME:  67898.00 SOD {18:51:38.00} UT
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       215.70d {+14h 22m 47s}  -14.19d {-14d 11' 41"}
SUN_DIST:         81.89 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:      265.48d {+17h 41m 55s}  -22.09d {-22d 05' 09"}
MOON_DIST:        92.14 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      274.50,-18.10 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.26,-78.17 [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 2.8% < P(seren) < 6.6%.

GCN Circular #26107
The Fermi GBM team reports the detection of a likely LONG GRB
At 18:43:16 UT on 31 Oct 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191031C (trigger 594240201.70685 / 191031780).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 120.8, Dec = -59.6 (J2000 degrees, equivalent to J2000 08h 03m, -59d 36'), with a statistical uncertainty of 1.6 degrees.
The angle from the Fermi LAT boresight is 19.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_skymap_all_bn191031780.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_healpix_all_bn191031780.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191031780/quicklook/glg_lc_medres34_bn191031780.gif
GCN Circular #26108
E. Ambrosi (INAF-IASFPA), A. D'Ai (INAF-IASFPA), J.D. Gropp (PSU), N. J. Klingler (PSU), H. A. Krimm (NSF), S Laha (GSFC/UMBC/CRESST), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 18:43:54 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 191031C (trigger=932595). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 115.862, -62.335 which is
```
   RA(J2000) = 07h 43m 27s
   Dec(J2000) = -62d 20' 04"
```
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 80 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 18:45:16.2 UT, 81.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 115.8682, -62.3247 which is equivalent to:
```
   RA(J2000)  = 07h 43m 28.37s
   Dec(J2000) = -62d 19' 28.9"
```
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This location is 38 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 2.60e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT inaf.it). 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/)
GCN Circular #26109
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 191031C, we find an enhanced XRT position of the afterglow: RA, Dec: 115.8709, -62.3251 which is equivalent to:
```
   RA (J2000)  = 07 43 29.01
   Dec (J2000) = -62 19 30.5
```
with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/932595.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #26115
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1562 s of XRT Photon Counting mode data and 3 UVOT images for GRB 191031C, 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 = 115.87049, -62.32466 which is equivalent to:
```
RA (J2000): 07h 43m 28.92s
Dec (J2000): -62d 19' 28.8"
```
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 #26119
C. Fletcher (USRA), R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 18:43:16.71 UT on 31 October 2019, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 191031C (trigger 594240201 / 191031780) which was also detected by the Swift BAT and XRT (Ambrosi et al. 2019, GCN 26108). The Fermi GBM Final Real-time Localization (GCN 26107) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 20 degrees.
The GBM light curve shows a complex, multi-peaked structure with a duration (T90) of about 78 s (50-300 keV). The time-averaged spectrum from T0+3.3 s to T0+81.2 s is best fit by a Band function with Epeak = 107 +/- 9 keV, alpha = -0.5 +/- 0.1, and beta = -2.3 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (1.33 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+42.2 s in the 10-1000 keV band is 7.3 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #26127
GRB 191031C: Swift/UVOT Detection
J. D. Gropp (PSU) and Ambrosi (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191031C 91 s after the BAT trigger (Ambrosi et al., GCN Circ. 26108). A source consistent with the XRT position (Goad et al. GCN Circ. 26115) is detected in the initial UVOT exposures.
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

u                   307         556            245          >19.71
whit                 92         242            147           20.27+-0.32
white               862        1011            147          >20.39
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #26130
D.N. Burrows (PSU), J. D. Gropp (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), A. Tohuvavohu (U. Toronto) and E. Ambrosi report on behalf of the Swift-XRT team:
We have analysed 4.9 ks of XRT data for GRB 191031C (Ambrosi et al. GCN Circ. 26108), from 87 s to 52.5 ks after the BAT trigger. The data comprise 1.6 ks in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 26109).
The late-time light curve (from T0+6.6 ks) can be modelled with a power-law decay with a decay index of alpha=1.06 (+0.17, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.99 (+0.08, -0.06). The best-fitting absorption column is 1.87 (+0.28, -0.08) x 10^21 cm^-2, consistent with the Galactic value of 1.8 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.79 (+0.12, -0.05) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.8 (+0.4, -0.0) x 10^21 cm^-2
Galactic foreground: 1.8 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.79 (+0.12, -0.05)
```
If the light curve continues to decay with a power-law decay index of 1.06, the count rate at T+24 hours will be 0.029 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-12 (1.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00932595.
This circular is an official product of the Swift-XRT team.
GCN Circular #26132
D. M. Palmer (LANL), E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 191031C (trigger #932595) (Ambrosi, et al., GCN Circ. 26108). The BAT ground-calculated position is RA, Dec = 115.880, -62.322 deg which is
```
  RA(J2000)  =  07h 43m 31.2s 
  Dec(J2000) = -62d 19' 20.1" 
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 24%.
The mask-weighted light curve shows several peaks. The first begins around T-40 sec and runs until T-20 sec. The second, brightest, peak begins immediately after, peaks around T+5 sec, and decays to background by T+120 sec. There are several weak peaks superimposed on this one, the largest coming around T+45 sec. T90 (15-350 keV) is 93.2 +- 19.0 sec (estimated error including systematics).
The time-averaged spectrum from T-37.98 to T+112.66 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.60 +- 0.07. The fluence in the 15-150 keV band is 7.2 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.04 sec in the 15-150 keV band is 4.6 +- 0.5 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/932595/BA/
GCN Circular #26146
Q. Luo, C. Cai, S. Xiao, Q. B. Yi, Y. G. Zheng, Y. Huang, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2019-10-31T18:43:16.00 (T0), Insight-HXMT/HE detected GRB 191031C (trigger ID: HEB191031780) in a routine search of the data, which was also triggered by Fermi/GBM (GCN #26107) and Swift-BAT (GCN #26108).
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 47.315 s measured from T0+0.74 s. The 1-ms peak rate, measured from T0+42.703 s, is 848 cnts/sec. The total counts from this burst is 11529 counts. The data of Insight-HXMT/HE suffers saturation in the brightest part. URL_LC: http://www.hxmt.org/images/GRB/HEB191031780_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.

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Jochen Greiner, last update: 02-Nov-2019 [Disclaimer]