TITLE: GCN CIRCULAR NUMBER: 40674 SUBJECT: GRB 250610B: GOTO optical upper limit DATE: 25/06/10 21:43:38 GMT FROM: Ben Gompertz at U of Birmingham b.gompertz@bham.ac.uk
B. P. Gompertz, D. O’Neill, D. Steeghs, R. Starling, K. Ackley, M. J. Dyer, J. Lyman, K. Ulaczyk, A. Kumar, B. Godson, D. K. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, and J. Casares report on behalf of the 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 detected GRB 250610B (Saccardi et al., GCN 40671).
Targeted observations were performed with GOTO-North centred at 2025-06-10 21:13:20 UT (+4.66h post trigger). Observations consisted of 4x90s exposures in the GOTO L-band (400-700 nm).
Images were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using deeper template observations. We detect no new sources within the ECLAIRS localisation region down to a 3-sigma limiting magnitude of L > 19.92 AB mag.
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 and the Instituto de Astrofisica de Canarias (IAC).
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