TITLE:   GCN CIRCULAR
NUMBER:  46216
SUBJECT: GRB 261110A : SVOM/GWAC-F60 optical upper limit
DATE:    26/11/10 15:44:40 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

Y.X. Guan, S.J. Yin (GXU), L.P. Xin, C. Wu, X.H. Han, P.P. Zhang, J.L. Wang (NAOC), Y.Y. Shi, J.X. Cao(GXU), W.J. Tan(PKU), X.G. Wang, E.W. Liang(GXU) report on behalf of the SVOM follow-up team:
 
We observed the field of GRB261110A detected by SVOM/ECLAIRs (Wang et al., GCN 46215), with the GWAC-F60 at Xinglong Observatory, China. F60 started observing at 2026-11-10T11:52:02 UTC, ~ 122 s after trigger. 

After coadding the images of R band, we do not find any uncataloged candidate within the SVOM/ECLAIRs error box (Wang et al., GCN 46215). We measure the following upper limit calibrated against the USNO-B1.0 catalog, and not corrected for Galactic extinction: 
R > 20.15 mag (5-sigma, mid-time 16.03 min after the trigger).


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.