TITLE: GCN CIRCULAR NUMBER: 40380 SUBJECT: GRB 250507A: REM optical/NIR observations DATE: 25/05/07 12:09:00 GMT FROM: Riccardo Brivio at INAF-OAB riccardo.brivio@inaf.it
R. Brivio, M. Ferro, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB), M. De Pasquale (Univ. of Messina) report on behalf of the REM team:
We observed the field of GRB 250507A detected by SVOM/ECLAIRs (Wang et al., GCN 40374) 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 07 at 06:45:31 UT (i.e. about 11 minutes after the burst), and lasted for about 2 hours.
From preliminary inspection, we do not detect any possible counterpart inside the SVOM/MXT error circle down to the following 3sigma limits:
r > 19.3 (AB; calibrated against the Pan-STARRS catalogue), at a mid-time of 33 minutes after the trigger;
H > 16.0 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 32 minutes after the trigger.
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