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Tucker, M. D. Fulton, M. E. Huber, M. Fraser, M. Gromadzki, M. Kopsacheili, M. Newsome, M. Nicholl, M. Pursiainen, P. Charalampopoulos, P. G. Jonker, P. Ramsden, P. Wiseman, R. J. Wainscoat, R. P. Fender, S. Gomez, S. J. Smartt, S. L. McGee, S. R. Oates, S. Srivastav, T. B. Lowe, T. de Boer, T. E. M\\\"uller-Bravo, T. Moore, T. Pessi, T.-W. Chen, X. Sheng","submitted_at":"2023-07-05T18:00:18Z","abstract_excerpt":"We present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, AT2022aedm, detected by the Asteroid Terrestrial impact Last Alert Survey (ATLAS). AT2022aedm exhibited a rise time of $9\\pm1$ days in the ATLAS $o$-band, reaching a luminous peak with $M_g\\approx-22$ mag. It faded by 2 magnitudes in $g$-band during the next 15 days. These timescales are consistent with other rapidly evolving transients, though the luminosity is extreme. Most surprisingly, the host galaxy is a massive elliptical with negligible current star formation. 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