GCN Circular 45490

Subject

GRB 260831B / sb26083106: SVOM/GWAC-F60A/B confirmation of optical variation of nova V* GK Per

Event

GRB 260831B

Date

2026-09-01T15:29:59Z (9 hours ago)

Edited On

2026-09-01T16:09:58Z (8 hours ago)

From

SVOM_group <svomgroup@bao.ac.cn>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of SVOM_group <svomgroup@bao.ac.cn>

Via

Web form

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 ).

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.