TITLE: GCN CIRCULAR NUMBER: 38132 SUBJECT: GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs DATE: 24/11/08 17:37:15 GMT FROM: Stéphane Schanne at CEA Paris-Saclay/IRFU s.schanne@cea.fr

SVOM/ECLAIRs Commissioning Team: Tatyana Sadibekova, 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), 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 the likely weak long duration GRB 241108A (SVOM trigger reference: sb24110802) at 2024-11-08T07:09:55 UTC (Tb).

The following trigger information was received on the ground with low-latency by the SVOM VHF Alert Network. The burst was detected by the Image Trigger (IMT) which sent a single Alert message, with a signal-to-noise ratio of 7.1 in the 20-120 keV energy band over a time window of 20.48 s starting at Tb. The Alert was produced 75 s before the entry to SAA, such that the Alert sequence was interrupted. The on-ground data analysis confirms a weak point-like source in the reconstructed sky image.

The burst localization is RA, Dec = 123.72, -7.19 (J2000).

The statistical uncertainty on this position is 11.9 arcminutes, to which we recommend adding 2 arcminutes of systematic uncertainty in quadrature.

SVOM did not slew to the burst since the detection significance was below slew threshold.

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 2024-11-08T07:09:55this burst is: s.schanne AT cea.fr.

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