TITLE: GCN CIRCULAR NUMBER: 45490 SUBJECT: GRB 260831B / sb26083106: SVOM/GWAC-F60A/B confirmation of optical vairation of nova V* GK Per DATE: 26/09/01 15:29:59 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> S.J. Yin ,Y.X. Guan (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 sb26083106 triggerd by SVOM (Godet et al., GCN 45477) with the GWAC-F60A/B at Xinglong Observatory, China. We started observing at 2026-08-31T18:37:43.39 UTC with a set of 50 images in R-band, 1.5 min after the trigger. We do not detect credible uncataloged candidates within ECLAIRs' error box, which is consistent with the reports from LCO (Guan et al., GCN 45482) and SVOM/VT (Li et al., GCN 45489). The following upper limit magnitude are derived R>18.6 mag (5-sigma at mid-time of 6.3 minutes after trigger), calibrated against USNO-B1.0 catalog, and not corrected for Galactic extinction. We also measure the classical nova V* GK Per ,which shows an amplitude variation cosistent with that reported by SVOM/VT (Li et al., GCN 45489). Two 60-cm GWAC-F60(A/B) are operated by Guangxi University and NAOC, CAS, at Xinglong Observatory, China. The field of view is 19*19 arcmin. View this GCN Circular online at https://gcn.nasa.gov/circulars/45490. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...