GCN Circular 37695
Subject
GRB 241001A : SVOM/VT optical detection
Date
2024-10-03T14:53:19Z (13 days ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
Via
Web form
SVOM/VT commissioning team: Y. L. Qiu, L. P. Xin, H. L. Li, C. Wu, X. H. Han, 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)
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 on behalf of the SVOM team:
During the commissioning phase of SVOM mission, we observed the GRB 241001A, detected by SVOM/ECLAIRs (Dagoneau et al. GCN 37655) with SVOM/VT telescope in ToO mode. The observation started at 2024-10-02T11:21:03 UT, approximately 18 hours after the burst, with a total exposure time of 3860 seconds. The VT telescope conducted observations simultaneously in two channels: VT_B (400nm-650nm) and VT_R (650nm-1000nm).
After stacking the images for both bands separately, the optical counterpart (as reported by Osborne et al. GCN 37670; Izzo & Malesani, GCN 37673; Breeveld et al. GCN 37678; Turpin et al. GCN 37679) was detected with magnitudes of VT_B = 23.54+/-0.20 mag and VT_R = 23.52+/-0.23 mag in the AB magnitude system.
The SpaceVariable 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.