GCN Circular 37934
Subject
GRB 241029A : Detection and localization of a bright long GRB by SVOM/ECLAIRs
Date
2024-10-29T07:47:35Z (2 months ago)
From
Stéphane Schanne at CEA Paris-Saclay/IRFU <s.schanne@cea.fr>
Via
Web form
SVOM/ECLAIRs Commissioning Team: Stéphane Schanne, Nicolas Dagoneau, Hervé Le Provost, Frédéric Chateau (CEA), Wenjin Xie, Donghua Zhao (NAOC), Jean-Luc Atteia, Laurent Bouchet, Sebastien Guillot, Juliette Alaux, Hui Yang (IRAP), Tais Maiolino (LUPM), Floriane Cangemi (APC), Karine Mercier, Marie-Claire Charmeau, Stefano Crepaldi (CNES)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Olivier Godet (IRAP), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Bing Zhang (UNLV)
Report on behalf of the SVOM team:
During the commissioning phase, the SVOM/ECLAIRs telescope detected and localized a bright long duration GRB 241029A at 2024-10-29T02:19:53 UTC (Tb), previously detected by Fermi (Fermi GBM team, GCN circular 37932), and by SVOM/GRM (SVOM reference: sb241002901).
The onboard trigger was not in operations, the following information was obtained by reprocessing on ground the data in the flight trigger algorithms. The burst was detected by the Count-Rate Trigger (CRT) and Image Trigger (IMT) which produced 22 Alert messages. The best Alert was obtained by CRT in the 8-120 keV energy band with a signal-to-noise ratio of 67.1 in a time window of 20.48 s starting at Tb.
The event location is RA, Dec = 325.327, Dec: 5.086 (J2000).
The statistical uncertainty on this position is 1.5 arcminutes to which we recommend adding 2 arcminutes of systematic uncertainty in quadrature.
SVOM did not slew to the burst since automated slewing was not enabled.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by APC, CEA, CNES, and IRAP.
The SVOM point of contact for this burst is: b.cordier AT cea.fr.