GCN Circular 45909
Subject
GRB 261011A: continued LCO optical observations
Event
Date
2026-10-11T20:09:17Z (15 hours ago)
From
luca.izzo@inaf.it
Via
Web form
L. Izzo (INAF-OACn and DARK/NBI) reports on behalf of a larger collaboration:
We continued to observe the afterglow of GRB261011A (Huang et al., GCN #45895; Cenko et al., GCN #45896) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at the Sutherland Observatory, South Africa. Observations started on 2026 October 11 at 18:56 UT (5.17 hr after the GRB trigger). We obtained a single image of 300s in the SDSS-g and SDSS-r filters.
The optical counterpart reported by Swift-UVOT (Cenko et al., GCN #45896) and by other ground-based facilities (O'Neill et al., GCN #45897, Fu et al., GCN #45898, Izzo et al., GCN #45899, Wu et al., GCN #45900, Yin et al., GCN #45901, Shi et al., GCN #45903, Aryan et al., GCN #45904, Arya et al., GCN #45907) is faintly detected in both images. We measure preliminary magnitudes of g = 21.91 +/- 0.17 mag and r = 21.09 +/- 0.14 (AB), calibrated against nearby stars from the Pan-STARRS catalog.
This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719.