GCN Circular 46273
Subject
GRB 261114A: SVOM/VT optical afterglow confirmation
Event
Date
2026-11-14T14:02:23Z (a day ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, C. Wu, Y. L. Qiu, Y. N. Ma, L. P. Xin, L. J. Chen, Z. H. Yao, J. R. Xu, 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), Ziqi Wang (GXU) report on behalf of the SVOM/VT team.
SVOM/VT performed observations with automatic slew on the field of GRB 261114A detected by SVOM/ECLAIRs (sb26111401, Li et al., GCN 46267). Our observation started on 2026-11-14T09:39:05 UT, 352 seconds post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously .
With the X-band data available, the optical counterpart identified through VT-VHF data (Wu et al., GCN 46269; Zhao et al., GCN 46272) was clearly detected in single frame of both channels. It shows a decay with a slope index of -0.9 over our 1.5 hr observation span. The following measurements are in AB magnitudes and are not corrected for Galactic extinction:
Mid time | Band | Exposure Time | Brightness
387 s VT_B 70 s 19.5 +/- 0.1 mag
387 s VT_R 70 s 18.0 +/- 0.1 mag
More observations are ongoing.
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.