GCN Circular 46193
Subject
GRB 261108A: SVOM/VT optical upper limits
Event
Date
2026-11-08T15:25:10Z (a day ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, Y. N. Ma, C. Wu, L. P. Xin, Y. L. Qiu, Z. H. Yao, J. R. Xu, L. J. Chen, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu), Youdong Hu (GXU), Clara Plasse (HKU) report on behalf of the SVOM/VT team.
SVOM/VT performed observation with automatic slew on the field of GRB 261108A triggered by SVOM/ECLAIRs (sb26110802, Xie et al., GCN 46186). The observation started at 2026-11-08T01:25:28 UTC, about 12.5 minutes post trigger in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously.
No credible uncatalogued candidates were identified in the stacked images within the ECLAIRs error box (Xie et al., GCN 46186), compared with the Legacy Survey, down to 22.0 mag (7 sigma) in AB magnitudes, at the mid-time of 1.4 hr post trigger.
Our non-detection is consistent with the LCO report (Guan et al., GCN 46190).
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.