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GCN Circular 36491

Subject
GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
Date
2024-05-15T19:26:57Z (13 days ago)
From
Amit Kumar at University of Warwick, UK <amitkundu515@gmail.com>
Via
Web form
A. Kumar, B. P. Gompertz, K. Ackley, J. Lyman, S. Belkin, A. J. Levan, R. Starling, M. J. Dyer, K. Ulaczyk, F. Jimenez-Ibarra, D. O'Neill, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Palle and D. Pollacco report on behalf of the GOTO collaboration:

The Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) autonomously responded to GRB 240514B, initially reported at RA = 341.9, Dec = -1.3 (J2000 degrees, equivalent to J2000 22h 47m, -1d 18') (Fermi GBM Team, GCN 36469).

Following the initial alert, the localisation was subsequently updated to RA = 5.1, Dec = 44.5, stated to be equivalent to J2000 22h 47m, -1d 19' (Roberts et al. GCN 36481). Inspection of the localisation map suggests the decimal coordinates are the correct ones, and the candidate optical counterpart identified by GOTO (Kumar et al. GCN 36488) is inconsistent with the GBM localisation.

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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