TITLE:   GCN CIRCULAR
NUMBER:  46250
SUBJECT: GRB 261113A : SVOM/GWAC-F60 optical afterglow detection
DATE:    26/11/13 16:49:43 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

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.