GCN Circular 45482
Subject
GRB 260831B: LCO optical upper limits
Event
Date
2026-09-01T06:56:51Z (a day ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
Y.X. Guan (GXU), A. Saccardi, D. Turpin (CEA/Irfu), C. Wu, L.P. Xin (NAOC), C.Guepin (LUPM), C. Plasse (HKU) report on behalf of the SVOM mission team:
We observed the field of GRB 260831B (SVOM burst-id sb26083106 detected by SVOM (Godet et al., GCN 45477) with the LCO 1m telescope at Tenerife equipped with the Sinistro instrument.
Our observation started on 2026-09-01 at 01:31:26 UT (about 6.92 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters.
In the stacked image, we do not detect any new source within the SVOM/ECLAIRs error box. We measure the following upper limit calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction:
r > 21.5 AB (5-sigma, mid-time 7.22 hr after the trigger);
z > 20.2 AB (5-sigma, mid-time 7.01 hr after the trigger).
This project is funded by the SVOM collaboration.