Quasi-bolometric grizyJHK light curve of SN 2019wxt, together with our late time HST measurement. Also shown are the quasi-bolometric light curves of the fast declining ultra-stripped SNe 2005E (Perets et al. 2010), 2005ek (Drout et al. 2013) and 2014ft (De et al. 2018) for comparison. The dashed vertical line indicates the time at which the GW event occurred. The errorbar represents the systematic error that stems from the uncertainty on the distance modulus.