GRB231020B

This page lists all entries on GRB231020B in GRBweb

Summary Fermi GBM GCN 34862 GCN 34864 GCN 34879

Summary table
Variable Value Source
GRB_name_Fermi GRB231020900
T0 21:35:52 UTC GCN_circulars,Fermi GBM final loc
ra 222.3800° Fermi_GBM
decl 17.2400° Fermi_GBM
pos_error 4.40e+00° Fermi_GBM
T90 22.528 s Fermi_GBM
T90_error 0.572 s Fermi_GBM
T90_start 21:35:54.699 UTC Fermi_GBM
fluence 3.82e-05 erg/cm² Fermi_GBM
fluence_error 6.50e-08 erg/cm² Fermi_GBM
T100 25.227 s
GBM_located True
mjd 60237.89990740741 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB231020900
trigger_name bn231020900
ra 222.3800°
decl 17.2400°
pos_error 4.40e+00°
datum 2023-10-20
t_trigger 21:35:52.907 UTC
T90 22.528 s
T90_error 0.572 s
T90_start 21:35:54.699 UTC
fluence 3.82e-05 erg/cm²
fluence_error 6.50e-08 erg/cm²
flux_1024 3.47e+01 erg/cm²/s
flux_1024_error 5.02e-01 erg/cm²/s
flux_1024_time 5.18e+00 erg/cm²/s
flux_64 3.94e+01 erg/cm²/s
flux_64_error 2.07e+00 erg/cm²/s
GCN 34862 table
GRB_name GRB231020B
GCN_number 34862
Detection_method Fermi GBM final loc
t_trigger 21:35:52 UTC
ra 221.4000°
decl 15.6000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34862 SUBJECT: GRB 231020B: Fermi GBM Final Real-time Localization DATE: 23/10/20 21:46:18 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 21:35:52 UT on 20 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231020B (trigger 719530557.906538 / 231020900). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 221.4, Dec = 15.6 (J2000 degrees, equivalent to J2000 14h 45m, 15d 35'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 98.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020900/quicklook/glg_skymap_all_bn231020900.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020900/quicklook/glg_healpix_all_bn231020900.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020900/quicklook/glg_lc_medres34_bn231020900.gif
GCN 34864 table
GRB_name GRB231020B
GCN_number 34864
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34864 SUBJECT: GRB 231020B: BALROG localization (Fermi Trigger 719530557 / GRB 231020900) DATE: 23/10/21 07:02:45 GMT FROM: Jochen Greiner at MPE T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 719530557 at 21:35:52 on 20 Oct. 2023 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 221.6+/-0.4 deg Decl.(2000.0) = 17.6+/-0.6 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB231020900/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB231020900/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB231020900/json
GCN 34879 table
GRB_name GRB231020B
GCN_number 34879
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 34879 SUBJECT: GRB 231020B: AstroSat CZTI detection DATE: 23/10/25 06:43:53 GMT FROM: Gaurav Waratkar at IIT Bombay P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a GRB 231020B which was also detected by Fermi - GBM (Fermi GBM Team, GCN Circ. 34862). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-10-20 21:35:57.50 UTC. The measured peak count rate associated with the burst is 148 (+30, -16) counts/s above the background in the combined data of two quadrants (out of four), with a total of 1242 (+296, -361) counts. The local mean background count rate was 177 (+1, -3) counts/s. Using cumulative rates, we measure a T90 of 34 (+8, -16) s. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-10-20 21:35:55.27 UTC. The measured peak count rate associated with the burst is 274 (+74, -45) counts/s above the background in the combined data of all quadrants, with a total of 1637 (+667, -683) counts. The local mean background count rate was 1501 (+5, -6) counts/s. We measure a T90 of 25 (+11, -15) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb