The Gravitational-wave Optical Transient Observer (GOTO) Fast Analysis and Spectroscopy of Transients (FAST) Surveys

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ID: 329840
2026
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Abstract
Abstract The study of young and fast astronomical transients is often limited by the difficulty of acquiring data, particularly spectra, within hours to days of explosion. Historically, follow-up programmes have rarely obtained spectra until many days after discovery; coupled with lower-cadence discovery observations, this has meant that the early evolution of transients has not been systematically probed. The Fast Analysis and Spectroscopy of Transients (FAST) programme aims to build a rich data set on the early evolution of a range of transients by linking a high-cadence discovery survey on the Gravitational-wave Optical Transient Observer (GOTO) with immediate visitor-mode spectroscopic follow-up. We report results from two prototype runs, FAST 23 and 24, carried out in August 2023 and February 2024 using the 2.54 m Isaac Newton Telescope. Between these, 51 transient classifications were reported, 19 of which were discovered by GOTO with a median time between discovery and first spectrum of < 2 days. We highlight the discovery and characterisation of SN 2024cld, enabled by spectroscopic observations beginning within 30 minutes of discovery, which reveals the complex mass-loss history of an evolved supergiant star in its final years prior to supernova. Further GOTO-FAST runs are ongoing at the Nordic Optical Telescope, and we hope this paper will be informative for those considering the creation of similar programmes.
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Authors B. Godson, J. D. Lyman, M. Pursiainen, Danny T. H. Steeghs, Benjamin D. R. Davies, Martin J. Dyer, N Koivisto, Michael K. Mitchell, D O'Neill, Bob Warwick, S Belkin, Paul Robin Brian Chote, D L Coppejans, Rob A. J. Eyles-Ferris, D Jarvis, Y Julakanti, L Kelsey, Mark R Kennedy, Thomas L. Killestein, A Kumar, A Levan, S Littlefair, M Magee, S Mandhai, D Mata Sánchez, S Mattila, J McCormac, J Mills, S Moran, J Mullaney, C Phillips, D Pollacco, K Pu, A Sahu, U Sawangwit, M Shrestha, E Stanway, R Starling, Yu-Zhu Sun, K Ulaczyk, L Vincetti, E Wickens, K Wiersema, D K Galloway, V. S. Dhillon, P O'Brien, Gavin Ramsay, K Noysena, R Kotak, R. P. Breton, L K Nuttall, Benjamin P. Gompertz, Jorge Casares
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1848
URL
https://doi.org/10.1093/mnras/stag1848
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