Fig. 6.

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UV data points for AT 2023fhn, compared with the UV light curves of AT 2018cow (Early u-band and late-time F222W and F336W, Prentice et al. 2018; Perley et al. 2019; Inkenhaag et al. 2023) and ZTF 20acigmel (Perley et al. 2021). A light-curve fit to the AT 2018cow data is increased in luminosity to intercept the sole early-time AT 2023fhn UV point, the subsequent F336W limit at ∼112 rest-frame days lies just above the expected UV magnitude at this epoch, assuming identical evolution to the Cow. A similar fit is made for the early-time ZTF 20acigmel points. Cyan horizontal bands show the expected UV absolute magnitudes at late times for accretion discs around IMBHs of different masses, following a tidal disruption event (Mummery et al. 2024).
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