TITLE:   GCN CIRCULAR
NUMBER:  42002
SUBJECT: GRB 250925A: SVOM/GWAC-F60A upper limit
DATE:    25/09/26 13:10:46 GMT
FROM:    Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>

L. P. Xin, X. H. Han, J. Wang, P. P. Zhang, W. L. Dong,  H. L. Li, C. WU, Y. L. Qiu, X .M. Lu, R. S. Zhang, Y. Xu, L. Huang, H. B. Cai, Y. J. Xiao, L. Lan,  W. J. Xie, Z. H. Yao, J. Y. Wei(NAOC), X. G. Wang, E. W. Liang(GXU) report on behalf of the SVOM follow-up team:

We observed the field of GRB 250925A (Dichiara et al., GCN 41985) with the GWAC-F60A at Xinglong Observatory, China. F60A started observing at 2025-09-25T17:05:15 UTC, about 49 sec after the burst. 

After the image stacking with the exposure time 9*20sec,  we do not detected the optical counterpart at the location (Corcoran et al., GCN 41990, Bochenek et al., GCN 41991, Masi et al., GCN 41992,Méndez et al., GCN 41995, Castro-Tirado et al., GCN 41997, Liu et al., GCN 41998) within the XRT error box (Page et al., GCN 41988). The upper limit of R~17.0 mag for GWAC-F60A at mid time of 132 seconds after burst.