TITLE: GCN CIRCULAR NUMBER: 44820 SUBJECT: GRB 260603A: NOT optical observations DATE: 26/06/04 12:05:46 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani@nbi.ku.dk> D. B. Malesani (DAWN/NBI and Radboud), L. Izzo (INAF/OACN and DARK/NBI), G. Corcoran (UCD), A. Martin-Carrillo (UCD), N. Pyykkinen (NOT), A. S. Mårtensson (NOT) report on behalf of a larger collaboration: We observed the optical afterglow (Guelfand et al., GCNs 44791, 44797; Li et al., GCN 44799) of the SVOM GRB 260603A (Zhao et al., GCN 44787) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out in the SDSS r band. The optical afterglow is detected with an AB magnitude r = 23.27 +- 0.21, at a mean epoch of Jun 4.02 UT (0.786 days after trigger). This magnitude is calibrated against nearby stars from the Pan-STARRS catalog, and is not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44820. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...