TITLE: GCN CIRCULAR NUMBER: 40687 SUBJECT: GRB 250610B: REM optical/NIR observations DATE: 25/06/11 11:49:21 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio@inaf.it> 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 250610B detected by SVOM/ECLAIRs (Saccardi et al., GCN 40671) 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, and H bands, started on 2025 June 10 at 22:45:52 UT (i.e. 6.2 hr after the burst), and lasted for about 1 hour. From preliminary inspection, we do not detect any possible counterpart at the position of the optical afterglow (Schneider et al., GCN 40676; Gompertz et al., GCN 40677; Li et al., GCN 40678; Bochenek et al., GCN 40684; Qiu et al., GCN 40685) down to the following 3sigma limits: r > 19.6 (AB; calibrated against the Pan-STARRS catalogue), at a mid-time of 6.7 hr after the trigger; H > 15.6 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 6.2 hr after the trigger. View this GCN Circular online at https://gcn.nasa.gov/circulars/40687. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...