TITLE: GCN CIRCULAR NUMBER: 39761 SUBJECT: GRB 250314A: REM optical/NIR upper limits DATE: 25/03/17 13:09:40 GMT FROM: Riccardo Brivio at INAF-OAB riccardo.brivio@inaf.it
R. Brivio, M. Ferro, S. Covino, P. D'Avanzo, S. Campana (INAF-OAB), D. B. Malesani (DAWN/NBI and Radboud), A. Melandri (INAF-OAR), D. Fugazza (INAF-OAB) report on behalf of the REM team:
We observed the field of the SVOM GRB 250314A (Wang et al., GCN 39719), followed-up by Swift/XRT (Kennea et al., GCN 39734) and EP/FXT (Turpin et al., GCN 39739), 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 March 15 at 01:18:28 UT (i.e. 12.4 hr after the burst), and lasted for about 1 hour.
From preliminary inspection, we do not find any counterpart at the position of the reported NIR afterglow (Malesani et al., GCN 39727; Malesani et al., GCN 39732) down to the following 3sigma limits:
r > 18.1 (AB; calibrated against the Pan-STARRS catalogue), at a mid-time of 12.9 hours after the trigger,
H > 16.1 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 12.8 hours after the trigger,
J > 16.8 (Vega; calibrated against the 2MASS catalogue) at a mid-time of 13.0 hours after the trigger.
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