GCN Circular 46250
Subject
GRB 261113A : SVOM/GWAC-F60 optical afterglow detection
Event
Date
2026-11-13T16:49:43Z (2 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
S.J. Yin (GXU), Y.X. Guan,C. Wu, L.P. Xin, L.J. Chen, X.H. Han, P.P. Zhang, J.L. Wang (NAOC), Y.Y. Shi, E.W. Liang, X.G. Wang(GXU) report on behalf of the SVOM follow-up team:
We observed the field of GRB261113A detected by SVOM/ECLAIRs (A. Saccardi et al., GCN 46244), with the GWAC-F60 at Xinglong Observatory, China. F60 started observing 2026-11-13 from 14:32:41.4 to 14:51:35.7 UTC.
We found a candidate at RA, DEC = 346.32051 , 5.17192 degrees:
R.A. (J2000) = 23h05m16.92s
Dec. (J2000) = +05d10m18.91s
with an uncertainty of ~ 0.5 arcsec.
The coordinates are consistent with those provided by the SYSU 80cm (Lin et al., GCN 46247）.The optical counterpart faded from 16.1 to 18.5 mag over a time span of ~ 19 min（Lei et al., GCN 46248; Li et al., GCN 46249).
We measure the following magnitudes calibrated against the USNO-B1.0 catalog, and not corrected for Galactic extinction.
Two 60cm GWAC-F60(A/B) are operated by Guangxi University and NAOC, CAS, at Xinglong Observatory, China. The field of view is 19*19 arcmin.