TITLE:   GCN CIRCULAR
NUMBER:  45490
SUBJECT: GRB 260831B / sb26083106: SVOM/GWAC-F60A/B confirmation of optical variation 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 triggered 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 consistent 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.