TITLE:   GCN CIRCULAR
NUMBER:  45869
SUBJECT: GRB 261007A / EP261007a: SVOM/GWAC-F60A/B observations
DATE:    26/10/09 00:16:20 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

S.J. Yin (GXU), C. Wu, L.P. Xin, X.H. Han, P.P. Zhang, J.L. Wang (NAOC), report on behalf of the SVOM follow-up team:
 
We observed the field of GRB261007A detected by SVOM/ (Goto et al., GCN 45824), with the GWAC-F60 at Xinglong Observatory, China. F60 started observing at 2026-10-07T14:00:22.98 UTC in R-band.

The optical counterpart (Zheng et al., GCN 45825; Saccardi et al., GCN 45829; Mohan et al., GCN 45832; Saccardi et al., GCN 45837; Shi et al., GCN 45838) is faintly detected in our images. We measure the following magnitudes calibrated against the USNO-B1.0 catalog, and not corrected for Galactic extinction: from forced photometry of the faint source,
R = 20.15 +/- 0.3 mag (mid-time 8.8 hr 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.