TITLE: GCN CIRCULAR NUMBER: 38086 SUBJECT: GRB 241104A: SVOM/VT optical candidate DATE: 24/11/05 18:38:03 GMT FROM: Liping Xin at NAOC, SVOM <xlp@nao.cas.cn> SVOM/VT commissioning team: Y. L. Qiu, H. L. Li, L. P. Xin, C. Wu, X. H. Han, J. Wang, W. J. Xie, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, J. S. Deng, L. Lan, X. M. Lu, R. S. Zhang, (NAOC), J. Zhang, L. J. Dan, G. Y. Zou, C. J. Wang, Y. F. Du, C. Huang (XIOPM), H. Zhou (PMO). SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP),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), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV) report on behalf of the SVOM team: VT started to observe the field of GRB 241104A (Fermi GBM Team, GCN #38075; Schanne et al., GCN #38078; Zhou et al., GCN #38081; Zhang et al., GCN #38082) in ToO mode from 2024-11-05T13:51:35 UT, about 19.4 hours after the burst. The VT conducted observations in VT_B band (400-650nm) and VT_R band (650-1000nm) simutaneously. An uncatalogued source was found in VT_R band stacked image with a total exposure time of 900s ranging from 13:51:35 to 14:08:15 UT, after compared to the DESI DR10 catalog. The coordinates are R.A.= 02:10:13.392, DEC.= +31:35:06.60, Error = 0.5 arcseconds, J2000. The magnitude was VT_R=21.6+/-0.1 mag and VT_B>23.0 mag (3 sigma). We proposed that it is likely the optical afterglow of the burst. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/38086. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...