TITLE: GCN CIRCULAR NUMBER: 38378 SUBJECT: EP241126a: SVOM/VT observations DATE: 24/11/29 03:41:17 GMT FROM: Huali Li at at NAOC, SVOM lhl@nao.cas.cn
SVOM/VT commissioning team: Y. L. Qiu, L. P. Xin, C. Wu, H. L. Li, 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), L. Zhang (IHEP), Y.D. Hu(GXU), X.L. Chen (YNU), K. Chatterjee (YNU)
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 fast X-ray transient EP241126a (EP-WXT，Hu et al., GCN 38335；EP-FXT，Zheng et al., GCN 38339; SVOM/GRM, Zheng et al., GCN 38342) in ToO mode from 2024-11-28T02:02:37.5 UT, about 30.38 hours after the burst. The VT conducted observations in VT_B band (400-650nm) and VT_R band (650-1000nm) simultaneously.
The optical counterpart (TRT, Fu et al., GCN 38337; GSP, Li et al., GCN 38338; WFST, Geng et al, GCN 38357) was detected in VT_R combined image with the brightness of 22.95 +/- 0.15 mag at the midtime of 33.27 hours after the burst. It was not detected in VT_B combined image, with the 3 sigma limit magnitudes of VT_B~24.1 mag. The exposure time of images in VT_R and VT_B are 5670 sec and 5760 sec respectively.
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.
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