GCN Circular 46138
Subject
GRB 261103A: LCO optical upper limits
Event
Date
2026-11-03T15:00:08Z (2 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
Y.X. Guan(GXU), A. Saccardi (CEA/Irfu), S.J. Yin(GXU), C. Wu (NAOC), L.P. Xin, Y.Y. Shi(GXU), X.H. Han(NAOC), D. Turpin (CEA/Irfu), Y.-H.Cheng (YNU), W.-L.Zhang (PMO)
report on behalf of the SVOM mission team:
We observed the field of GRB 261103A (detected by SVOM (Brunet et al., GCN 46137) with the LCO 1m telescope at Siding Spring Observatory equipped with the Sinistro instrument.
Our observation started on 2026-11-03T12:25:42.756 UT (about 5.58 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 > 22.11 AB (5-sigma, mid-time 5.84 hr after the trigger);
z > 19.68 AB (5-sigma, mid-time 6.31 hr after the trigger).
This project is funded by the SVOM collaboration.