TITLE: GCN CIRCULAR NUMBER: 38133 SUBJECT: GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart DATE: 24/11/08 18:54:20 GMT FROM: Alan Watson at UNAM alan@astro.unam.mx
J.-G. Ducoin (CPPM), Francesco Magnani (CPPM), Alan M. Watson (UNAM), S. Antier (OCA), Damien Dornic (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), D. Akl (AUS), Jean-Luc Atteia (IRAP), Nathaniel R. Butler (ASU), Francis Fortin (IRAP), Simona Lombardo (LAM), and Margarita Pereyra (UNAM)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Jean-Luc Atteia (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:
We imaged the field of GRB 241108A detected by SVOM/ECLAIRs (Sadibekova et al., GCN Circ. 38132) during the commissioning of the COLIBRÍ (SVOM/F-GFT) telescope at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico.
We observed with the engineering test camera in a red filter that approximates SDSS r. The data were reduced using custom software and then analysed and calibrated against the PS1 catalog using the STDWeb service. Our field covers a 13 arcmin square region centered on the ECLAIRS position and does not cover the whole uncertainty region.
In 9840 seconds of exposure from 2024-11-08 08:47 to 12:34 (1.63 to 5.41 hours after the trigger, we detect no sources other than those previously identified in the PS1 or GAIA DR3 catalogs to a 5-sigma limiting AB magnitude of:
r > 22.3
We warmly thank the COLIBRÍ engineering team and the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir. We warmly thank the GRANDMA IJCLAB team and S. Karpov for the access of the STDWeb service for STDPipe.
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