GCN Circular 40349
Subject
GRB 250502A: REM optical/NIR observations
Date
2025-05-05T10:33:25Z (10 hours ago)
From
Riccardo Brivio at INAF-OAB <riccardo.brivio@inaf.it>
Via
Web form
R. Brivio, M. Ferro, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team:
We observed the field of GRB 250502A detected by SVOM/ECLAIRs (Wang et al., GCN 40313) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, and K bands, started on 2025 May 02 at 22:59:17 UT (i.e. 14.2 hr after the burst), and lasted for about 1 hour.
From preliminary inspection, we do not detect any counterpart at the position of the optical afterglow (Rakotondrainibe et al., GCN. 40315; An et al., GCN 40319; Li et al., GCN 40320; Ghosh et al, GCN 40322; de Ugarte Postigo et al., GCN 40328; Pérez-Fournon et al., GCN 40330; Odeh et al., GCN 40331; Bochenek & Perley, GCN 40333; Corcoran et al., GCN 40334; Leonini et al., GCN 40337; Zheng et al., GCN 40338; Pankov et al., GCN 40339) down to the following 3sigma limits:
r > 19.8 (AB; calibrated against the Pan-STARRS catalogue),
at a mid-time of 14.7 hours after the trigger;
H > 16.0 (Vega; calibrated against the 2MASS catalogue),
at a mid-time of 14.2 hours after the trigger.