TITLE: GCN CIRCULAR NUMBER: 44460 SUBJECT: GRB 260504B: REM optical/NIR observations DATE: 26/05/04 15:24:20 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 260504B detected by SVOM/ECLAIRs (Saccardi et al., GCN 44454) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried out in the g, r, i, z, and H bands, started on 2026 May 04 at 09:41:12 UT (i.e. 9.9 min after the burst), and lasted for about 1.5 hours. From preliminary inspection, we do not detect any counterpart within the SVOM/ECLAIRs and SVOM/MXT error circles down to the following 3sigma limits: r > 19.5 (AB; calibrated against the SkyMapper catalogue), at a mid-time of 33.8 min after the trigger; H > 15.3 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 13.3 min after the trigger. View this GCN Circular online at https://gcn.nasa.gov/circulars/44460. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...