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Luminous Fast Blue Optical Transients (LFBOTs) - the prototypical examplebeing AT2018cow - are a rare class of events whose origins are poorlyunderstood. They are characterised by rapid evolution, featureless blue spectraat early times, and luminous X-ray and radio emission. LFBOTs thus far havebeen found exclusively at small projected offsets from star-forming hostgalaxies. We present Hubble Space Telescope, Gemini, Chandra and Very LargeArray observations of a new LFBOT, AT2023fhn. The Hubble Space Telescope datareveal a large offset (greater than 3.5 half-light radii) from the two closestgalaxies, both at a redshift of 0.24. The location of AT2023fhn is in starkcontrast with previous events, and demonstrates that LFBOTs can occur in arange of galactic environments.

AT2023fhn (the Finch): a Luminous Fast Blue Optical Transient at a large offset from its host galaxy