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Searching for Fermi GRB optical counterparts with the prototype Gravitational-wave Optical Transient Observer (GOTO)

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journal contribution
posted on 17.11.2021, 09:21 by Y-L Mong, K Ackley, DK Galloway, M Dyer, R Cutter, MJ Brown, J Lyman, K Ulaczyk, D Steeghs, V Dhillon, P O'Brien, G Ramsay, K Noysena, R Kotak, R Breton, L Nuttall, E Palle, D Pollacco, E Thrane, S Awiphan, U Burhanudin, P Chote, A Chrimes, E Daw, C Duffy, R Eyles-Ferris, B Gompertz, T Heikkila, P Irawati, M Kennedy, T Killestein, A Levan, S Littlefair, L Makrygianni, T Marsh, D Mata-Sanchez, S Mattila, J Maund, J McCormac, D Mkrtichian, J Mullaney, E Rol, U Sawangwit, E Stanway, R Starling, P Strom, S Tooke, K Wiersema
The typical detection rate of ∼1 gamma-ray burst (GRB) per day by the Fermi Gamma-ray Burst Monitor (GBM) provides a valuable opportunity to further our understanding of GRB physics. However, the large uncertainty of the Fermi localization typically prevents rapid identification of multiwavelength counterparts. We report the follow-up of 93 Fermi GRBs with the Gravitational-wave Optical Transient Observer (GOTO) prototype on La Palma. We selected 53 events (based on favourable observing conditions) for detailed analysis, and to demonstrate our strategy of searching for optical counterparts. We apply a filtering process consisting of both automated and manual steps to 60 085 candidates initially, rejecting all but 29, arising from 15 events. With ≈3 GRB afterglows expected to be detectable with GOTO from our sample, most of the candidates are unlikely to be related to the GRBs. Since we did not have multiple observations for those candidates, we cannot confidently confirm the association between the transients and the GRBs. Our results show that GOTO can effectively search for GRB optical counterparts thanks to its large field of view of ≈40 deg2 and its depth of ≈20 mag. We also detail several methods to improve our overall performance for future follow-up programmes of Fermi GRBs.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 507, Issue 4, November 2021, Pages 5463–5476, https://doi.org/10.1093/mnras/stab2499

Author affiliation

Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

507

Issue

4

Pagination

5463 - 5476

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

27/08/2021

Copyright date

2021

Available date

17/11/2021

Language

English