Gamma-ray Burst 191202A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:49:16 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     597012536
GRB_RA:          242.650d {+16h 10m 36s} (J2000),
                 242.868d {+16h 11m 28s} (current),
                 242.102d {+16h 08m 24s} (1950)
GRB_DEC:         +20.467d {+20d 28' 00"} (J2000),
                 +20.416d {+20d 24' 57"} (current),
                 +20.596d {+20d 35' 45"} (1950)
GRB_ERROR:       8.12 [deg radius, statistical plus systematic]
GRB_INTEN:       163 [cnts/sec]
DATA_SIGNIF:     9.40 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:        15.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.96
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      62%  GRB
2nd_MOST_LIKELY:  26%  Solar Flare
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 04"}
SUN_DIST:         42.81 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:      328.50d {+21h 54m 00s}  -16.81d {-16d 48' 34"}
MOON_DIST:        91.86 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       35.76, 44.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      235.42, 40.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 223.75,-22.82 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:49:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     597012536
GRB_RA:          247.883d {+16h 31m 32s} (J2000),
                 248.096d {+16h 32m 23s} (current),
                 247.350d {+16h 29m 24s} (1950)
GRB_DEC:         +22.517d {+22d 31' 00"} (J2000),
                 +22.475d {+22d 28' 31"} (current),
                 +22.623d {+22d 37' 22"} (1950)
GRB_ERROR:       5.07 [deg radius, statistical plus systematic]
GRB_INTEN:       870 [cnts/sec]
DATA_SIGNIF:     54.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:        10.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.86
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 04"}
SUN_DIST:         44.48 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN:      328.50d {+21h 54m 00s}  -16.81d {-16d 48' 33"}
MOON_DIST:        87.88 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       40.41, 40.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      241.21, 43.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 223.75,-22.82 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:49:33 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     597012536
GRB_RA:          246.440d {+16h 25m 46s} (J2000),
                 246.664d {+16h 26m 39s} (current),
                 245.878d {+16h 23m 31s} (1950)
GRB_DEC:         +17.090d {+17d 05' 24"} (J2000),
                 +17.046d {+17d 02' 45"} (current),
                 +17.203d {+17d 12' 09"} (1950)
GRB_ERROR:       1.83 [deg radius, statistical only]
DATA_SIGNIF:     28.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         319.00 [deg]
GRB_THETA:        14.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 04"}
SUN_DIST:         39.10 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
MOON_POSTN:      328.50d {+21h 54m 00s}  -16.81d {-16d 48' 32"}
MOON_DIST:        87.41 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       33.14, 39.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.92, 38.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_597012536.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:50:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     597012536
GRB_RA:          245.180d {+16h 20m 43s} (J2000),
                 245.405d {+16h 21m 37s} (current),
                 244.616d {+16h 18m 28s} (1950)
GRB_DEC:         +16.790d {+16d 47' 24"} (J2000),
                 +16.744d {+16d 44' 37"} (current),
                 +16.908d {+16d 54' 29"} (1950)
GRB_ERROR:       1.43 [deg radius, statistical only]
DATA_SIGNIF:     20.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         317.00 [deg]
GRB_THETA:        15.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 05"}
SUN_DIST:         38.88 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      328.50d {+21h 54m 01s}  -16.81d {-16d 48' 27"}
MOON_DIST:        88.46 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       32.19, 40.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.50, 37.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_597012536.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:50:22 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     597012536
GRB_RA:          246.400d {+16h 25m 36s} (J2000),
                 246.624d {+16h 26m 30s} (current),
                 245.838d {+16h 23m 21s} (1950)
GRB_DEC:         +17.080d {+17d 04' 48"} (J2000),
                 +17.036d {+17d 02' 09"} (current),
                 +17.193d {+17d 11' 34"} (1950)
GRB_ERROR:       1.16 [deg radius, statistical only]
DATA_SIGNIF:     42.80 [sigma]
DATA_INTERVAL:   9.216 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         319.00 [deg]
GRB_THETA:        14.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 05"}
SUN_DIST:         39.09 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
MOON_POSTN:      328.51d {+21h 54m 02s}  -16.81d {-16d 48' 25"}
MOON_DIST:        87.45 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       33.11, 39.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.87, 38.16 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_597012536.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:50:30 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     597012536
GRB_RA:          245.620d {+16h 22m 29s} (J2000),
                 245.842d {+16h 23m 22s} (current),
                 245.062d {+16h 20m 15s} (1950)
GRB_DEC:         +18.010d {+18d 00' 36"} (J2000),
                 +17.964d {+17d 57' 52"} (current),
                 +18.126d {+18d 07' 34"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     72.10 [sigma]
DATA_INTERVAL:   11.264 [sec]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         314.00 [deg]
GRB_THETA:        14.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       248.77d {+16h 35m 04s}  -22.00d {-22d 00' 05"}
SUN_DIST:         40.07 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      328.51d {+21h 54m 02s}  -16.81d {-16d 48' 24"}
MOON_DIST:        88.45 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       33.90, 40.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.70, 38.92 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_597012536.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Dec 19 20:58:11 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     597012536
GRB_RA:          245.340d {+16h 21m 22s} (J2000),
                 245.565d {+16h 22m 16s} (current),
                 244.776d {+16h 19m 06s} (1950)
GRB_DEC:         +16.800d {+16d 48' 00"} (J2000),
                 +16.754d {+16d 45' 14"} (current),
                 +16.917d {+16d 55' 03"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18819 TJD;   336 DOY;   19/12/02
GRB_TIME:        74931.23 SOD {20:48:51.23} UT
GRB_PHI:         317.00 [deg]
GRB_THETA:        15.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       248.77d {+16h 35m 06s}  -22.00d {-22d 00' 08"}
SUN_DIST:         38.88 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      328.57d {+21h 54m 17s}  -16.79d {-16d 47' 19"}
MOON_DIST:        88.38 [deg]
MOON_ILLUM:      37 [%]
GAL_COORDS:       32.28, 40.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.69, 37.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_locplot_all_bn191202867.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:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.

GCN Circular #26323
The Fermi GBM team reports the detection of a likely LONG GRB
At 20:48:51 UT on 2 Dec 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191202A (trigger 597012536.229574 / 191202867).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.3, Dec = 16.8 (J2000 degrees, equivalent to J2000 16h 21m, 16d 48'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 15.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_skymap_all_bn191202867.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/bn191202867/quicklook/glg_healpix_all_bn191202867.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191202867/quicklook/glg_lc_medres34_bn191202867.gif
GCN Circular #26326
R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a GRB 191202A, which was also detected by Fermi GBM Final Real-time Localization (GCN #26323).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 2019-12-02 20:48:51 UT. The measured peak count rate associated with the burst is 829 cts/s above the background in the combined data of four quadrants, with a total of 3809 cts. The local mean background count rate was 499 cts/s. Using cumulative rates, we measure a T90 of 11.92 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #26329
P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team:
"At 20:48:51.23 UT on 2 December 2019, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 191202A (trigger 597012536 / 191202867) which was also detected by the Fermi-LAT. The GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 12 degrees.
The GBM light curve shows two pulses with a duration (T90) of about 30.7 s (50-300 keV). The time-averaged spectrum from T0-1.0 s to T0+18.4 s is best fit by a Band function with Epeak = 190 +/- 19 keV, alpha = -1.20 +/- 0.04, and beta = -2.05 +/- 0.08.
The event fluence (10-1000 keV) in this time interval is (1.95 +/- 0.04)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+9.0 s in the 10-1000 keV band is 23.5 +/- 0.4 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 #26330
D. Kocevski (NASA/GSFC), R. Angioni (ASI/SSDC and INFN, Roma2), F. Longo (University and INFN, Trieste), N. Omodei (Stanford University), E. Bissaldi (Politecnico and INFN, Bari) and L. Scotton (CNRS/IN2P3/LUPM, Montpellier)
report on behalf of the Fermi-LAT Collaboration:
On December 2nd, 2019, Fermi-LAT detected high-energy emission from GRB 191202A, which was also detected by Fermi-GBM (trigger 597012536/191202867) (Veres et al. 2019, GCN 26329).
The best LAT on-ground location is found to be
RA, Dec = 249.54, 17.56 (degrees, J2000)
with an error radius of 0.24 deg (90% containment, statistical error only).
This was 11.4 deg from the LAT boresight at the time of the GBM trigger: T0 = 20:48:51.23 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-1000s after the GBM trigger is 2.6e-06 +/- 8.8e-07 ph/cm2/s.
The estimated photon index above 100 MeV is -1.6 +/- 0.2.
The highest-energy photon is a 1.8 GeV event which is observed 393 seconds after the GBM trigger.
The Fermi-LAT point of contact for this burst is Lorenzo Scotton (lorenzo.scotton@lupm.in2p3.fr).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #26344
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB191202A (AstroSat CZTI detection: Gaikwad et al., GCN 26326; Fermi GBM observation: Veres & Meegan, GCN 26329; Fermi-LAT detection: Kocevski et al., GCN 26330) triggered Konus-Wind at T0=74930.521 s UT (20:48:50.521).
The burst light curve shows a multi-peaked structure which starts at ~T0-3.9 s and has a total duration of~17.6 s. The emission is seen up to ~1.3 MeV.
As observed by Konus-Wind, the burst had a fluence of 2.78(-0.68,+0.76)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+7.024 s, of 8.80(-2.80,+3.04)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+15.872 s) is best fit in the 20 keV - 1.3 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.22(-0.12,+0.22), the high energy photon index beta = -2.17(-1.00,+0.26), the peak energy Ep = 265(-87,+91) keV, chi2 = 46/59 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB191202_T74930/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #26370
Y. G. Zheng, C. Cai, Q. Luo, S. Xiao, Q. B. Yi, Y. Huang, C. K. Li, G. Li, X. B. 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 2019-12-02T20:48:59.55 (T0), Insight-HXMT/HE detected GRB 191202A (trigger ID: HEB191202867) in a routine search of the data, which was also triggered by Fermi/GBM (GCN #26323), AstroSat CZTI (GCN #26326) and Konus-Wind (GCN #26344).
The Insight-HXMT/HE light curve mainly consists of a single pulse with a duration (T90) of 11.09 s measured from T0-5.67 s. The 1-ms peak rate, measured from T0-0.08 s, is 2101 cnts/sec. The total counts from this burst is 5960 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB191202867_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: 21-Dec-2019 [Disclaimer ]