GRB 230911A: The first discovery of a Fermi GRB optical counterpart with the gravitational-wave optical transient observer (GOTO)

Abstract

We report on the detection of candidate optical counterpart GOTO23akf/AT2023shv to the GRB 230911A with the Gravitational-wave Optical Transient Observer (GOTO) instruments located at La Palma, Canary Islands, and Siding Spring Observatory, Australia. The Fermi Gamma-ray Burst Monitor, which finds gamma-ray bursts (GRBs) nearly every two days, detected GRB 230911A with a statistical uncertainty of 4fdg1. However, the large (∼10–100 deg2) localization areas mostly impede the rapid identification of an optical counterpart. GOTO facilities fully covered 90% localization area of the GRB 230911A. We proposed GOTO23akf as the optical afterglow of GRB 230911A, subsequently confirmed through Swift-X-Ray Telescope observations in which an uncatalogued X-ray source spatially coincident with the GOTO candidate was detected. This is the first optical afterglow discovery for a Fermi GRB with the newly expanded GOTO network.

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Item Type:	Article
Authors/Creators:	Belkin, S. Gompertz, B.P. https://orcid.org/0000-0002-5826-0548 Kumar, A. https://orcid.org/0000-0002-4870-9436 Ackley, K. Galloway, D.K. https://orcid.org/0000-0002-6558-5121 Jiménez-Ibarra, F. Killestein, T.L. https://orcid.org/0000-0002-0440-9597 O’Neill, D. Wiersema, K. https://orcid.org/0000-0002-9133-7957 Malesani, D.B. https://orcid.org/0000-0002-7517-326X Levan, A.J. https://orcid.org/0000-0001-7821-9369 Lyman, J. https://orcid.org/0000-0002-3464-0642 Dyer, M.J. https://orcid.org/0000-0003-3665-5482 Ulaczyk, K. https://orcid.org/0000-0001-6364-408X Steeghs, D. Dhillon, V.S. O’Brien, P. Ramsay, G. https://orcid.org/0000-0001-8722-9710 Noysena, K. https://orcid.org/0000-0001-9109-8311 Kotak, R. https://orcid.org/0000-0001-5455-3653 Breton, R.P. https://orcid.org/0000-0001-8522-4983 Nuttall, L.K. Pallé, E. https://orcid.org/0000-0003-0987-1593 Pollacco, D. https://orcid.org/0000-0001-9850-9697 Awiphan, S. Burhanudin, U. Chote, P. Chrimes, A. Daw, E. Duffy, C. Eyles-Ferris, R. https://orcid.org/0000-0002-8775-2365 Godson, B. Heikkilä, T. Irawati, P. https://orcid.org/0000-0002-3348-1491 Kelsey, L. Kennedy, M.R. Littlefair, S. https://orcid.org/0000-0001-7221-855X Makrygianni, L. https://orcid.org/0000-0002-7466-4868 Marsh, T. Mata Sánchez, D. https://orcid.org/0000-0003-0245-9424 Mattila, S. Maund, J. https://orcid.org/0000-0003-0733-7215 McCormac, J. https://orcid.org/0000-0003-1631-4170 Mkrtichian, D. Mullaney, J. https://orcid.org/0000-0002-3126-6712 Patel, M. Rana, J. Rol, E. Sawangwit, U. Stanway, E. https://orcid.org/0000-0002-8770-809X Starling, R. https://orcid.org/0000-0001-5803-2038 Strøm, P.A. https://orcid.org/0000-0002-7823-1090 Warwick, B.
Copyright, Publisher and Additional Information:	© 2024 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Dates:	Published: January 2024 Published (online): 4 January 2024 Accepted: 1 December 2023 Submitted: 1 December 2023
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	08 Jan 2024 15:35
Last Modified:	08 Jan 2024 15:35
Status:	Published
Publisher:	American Astronomical Society
Refereed:	Yes
Identification Number:	10.3847/2515-5172/ad1876
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:207316

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GRB 230911A: The first discovery of a Fermi GRB optical counterpart with the gravitational-wave optical transient observer (GOTO)

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