GRB230817A

This page lists all entries on GRB230817A in GRBweb

Summary Fermi GBM GCN 34464 GCN 34465 GCN 34466 GCN 34472

Summary table
Variable Value Source
GRB_name_Fermi GRB230817502
T0 12:02:56 UTC GCN_circulars,Fermi GBM final loc
ra 325.8500° Fermi_GBM
decl 14.1600° Fermi_GBM
pos_error 3.29e+00° Fermi_GBM
T90 45.313 s Fermi_GBM
T90_error 1.557 s Fermi_GBM
T90_start 12:02:59.372 UTC Fermi_GBM
fluence 2.14e-05 erg/cm² Fermi_GBM
fluence_error 4.73e-08 erg/cm² Fermi_GBM
T100 48.685 s
GBM_located True
mjd 60173.50203703704 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB230817502
trigger_name bn230817502
ra 325.8500°
decl 14.1600°
pos_error 3.29e+00°
datum 2023-08-17
t_trigger 12:02:56.556 UTC
T90 45.313 s
T90_error 1.557 s
T90_start 12:02:59.372 UTC
fluence 2.14e-05 erg/cm²
fluence_error 4.73e-08 erg/cm²
flux_1024 9.40e+00 erg/cm²/s
flux_1024_error 3.14e-01 erg/cm²/s
flux_1024_time 3.48e+01 erg/cm²/s
flux_64 1.23e+01 erg/cm²/s
flux_64_error 1.34e+00 erg/cm²/s
GCN 34464 table
GRB_name GRB230817A
GCN_number 34464
Detection_method Fermi GBM final loc
t_trigger 12:02:56 UTC
ra 325.9000°
decl 14.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34464 SUBJECT: GRB 230817A: Fermi GBM Final Real-time Localization DATE: 23/08/17 12:12:24 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 12:02:56 UT on 17 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230817A (trigger 713966581.55559 / 230817502). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 325.9, Dec = 14.2 (J2000 degrees, equivalent to J2000 21h 43m, 14d 11'), with a statistical uncertainty of 3.3 degrees. The angle from the Fermi LAT boresight is 93.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230817502/quicklook/glg_skymap_all_bn230817502.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/bn230817502/quicklook/glg_healpix_all_bn230817502.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230817502/quicklook/glg_lc_medres34_bn230817502.gif
GCN 34465 table
GRB_name GRB230817A
GCN_number 34465
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34465 SUBJECT: GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502) DATE: 23/08/17 12:41:57 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 713966581 at 12:02:56 on 17 Aug. 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) = 324.8+/-1.0 deg Decl.(2000.0) = 17.0+/-0.9 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB230817502/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB230817502/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB230817502/json
GCN 34466 table
GRB_name GRB230817A
GCN_number 34466
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34466 SUBJECT: Fermi GRB 230817A: Global MASTER-Net observations report DATE: 23/08/17 14:30:32 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 230817A ( Fermi GBM team, GCN 34464) errorbox 5213 sec after notice time and 5246 sec after trigger time at 2023-08-17 13:30:22 UT, with upper limit up to 15.9 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -9.7 deg. The galactic latitude b = -29 deg., longitude l = 70 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2255349 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 5254 | 2023-08-17 13:30:22 | MASTER-Tunka | (21h 48m 35.92s , +12d 10m 22.3s) | C | 15 | 15.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 34472 table
GRB_name GRB230817A
GCN_number 34472
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 34472 SUBJECT: GRB 230817A: AstroSat CZTI detection DATE: 23/08/18 05:55:19 GMT FROM: Gaurav Waratkar at IIT Bombay P. K. Navaneeth (IUCAA), B. Pari (IITB), 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 long GRB 230817A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 34464). The source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-17 12:03:31.50 UTC. The measured peak count rate associated with the burst is 470 (+48, -40) counts/s above the background in the combined data of all quadrants, with a total of 7321 (+420, -529) counts. The local mean background count rate was 418 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 48 (+6, -7) s. In the preliminary analysis, we find 537 Compton events associated with this event. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-17 12:03:31.31 UTC. The measured peak count rate associated with the burst is 361 (+80, -24) counts/s above the background in the combined data of all quadrants, with a total of 4084 (+1006, -1452) counts. The local mean background count rate was 1322 (+5, -4) counts/s. We measure a T90 of 33 (+9, -5) 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