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Prieto, Juna Kollmeier, Kuntal Misra, Luc Dessart, Lukasz Wyrzykowski, Mariusz Gromadzki, Maximilian D. Stritzinger, Morgan Fraser, Mridweeka Singh, Nancy Elias-Rosa, Panos Charalampopoulos, Peter G. Jonker, Peter Lundqvist, Petri Vaisanen, Ping Chen, Raya Dastidar, Rubina Kotak, Santiago Gonz\\'alez-Gait\\'an, Seppo Mattila, Stefano Benetti, Stephen B. Potter, Subhash Bose, Subo Dong, Thomas Reynolds, Thomas Wevers, Tuomas Kangas","submitted_at":"2024-08-08T18:00:04Z","abstract_excerpt":"We present ultraviolet, optical and near-infrared photometric and optical spectroscopic observations of the luminous, fast blue optical transient (LFBOT), CSS161010:045834-081803 (CSS161010). The transient was found in a low-redshift (z=0.033) dwarf galaxy. The light curves of CSS161010 are characterized by an extremely fast evolution and blue colours. The V-band light curve shows that CSS161010 reaches an absolute peak of M$_{V}^{max}=-20.66\\pm0.06$ mag in 3.8 days from the start of the outburst. 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