TITLE: GCN CIRCULAR NUMBER: 38078 SUBJECT: GRB 241104A : Detection and localization by SVOM/ECLAIRs DATE: 24/11/05 09:21:16 GMT FROM: Stéphane Schanne at CEA Paris-Saclay/IRFU <s.schanne@cea.fr> SVOM/ECLAIRs Commissioning Team: Stéphane Schanne, Nicolas Dagoneau, Hervé Le Provost, Frédéric Chateau (CEA), Jean-Luc Atteia, Laurent Bouchet, Sebastien Guillot, Juliette Alaux, Hui Yang (IRAP), Tais Maiolino (LUPM), Wenjin Xie, Donghua Zhao (NAOC), Alexis Coleiro (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 the bright long duration GRB 241104A at 2024-11-04T18:30:15 UTC (Tb), previously detected by Fermi (Fermi GBM team, GCN circular 38075), and by SVOM/GRM (SVOM reference: sb24110402). The onboard trigger was not in operations, the following information was obtained by reprocessing the data on ground in the flight trigger algorithms. The burst was detected by the Count-Rate Trigger (CRT) and Image Trigger (IMT) which produced 21 Alert messages. The best Alert was obtained by CRT in the 8-120 keV energy band with a signal-to-noise ratio of 55.5 in a time window of 10.24 s starting at Tb. The event location is RA, Dec = 32.552, 31.554 (J2000). The statistical uncertainty on this position is 1.6 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: s.schanne AT cea.fr. View this GCN Circular online at https://gcn.nasa.gov/circulars/38078. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...