TITLE: GCN CIRCULAR NUMBER: 45431 SUBJECT: GRB 260822A: GOTO optical counterpart detection DATE: 26/08/23 12:55:36 GMT FROM: d.s.oneill@bham.ac.uk D. O'Neill, S. Moran, M. Kennedy, R. Starling, B. Gompertz, K. Ackley, M. Dyer, G. Ramsay, J. Lyman, K. Ulaczyk, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. Breton, J. Casares, L. Nuttall, B. Godson, T. Killestein, A. Kumar, M. Pursiainen, on behalf of GOTO collaboration: We report on optical observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022, Dyer et al. 2024) in response to the SVOM/ECLAIRS alert for GRB 260822A (Schanne et al.; GCN #45422). Following the detection of an optical counterpart candidate of GRB 260822A (Globus et al., GCN #45429; Li et al., GCN #45430), we checked the position of the candidate in the targeted GOTO data (O'Neill et al. GCN #45423) and identify the counterpart at a 4-sigma level with magnitude L = 21.00 ± 0.25 AB mag at 2026-08-22 18:28:33 (+1.63h). We note an earlier non-detection with 3-sigma limiting magnitude L > 21.26 AB mag at 2026-08-22 17:21:22 (+0.51h). GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester, the University of Birmingham and the Instituto de Astrofisica de Canarias (IAC). View this GCN Circular online at https://gcn.nasa.gov/circulars/45431. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...