Swift UVOT light curves of X-ray detected sources (except for UV Aur that saturated the UVOT detector and SWIFT J171951.7-300206 that was only detectable after combining the individual exposures during each visit, see Sect. 3). We show the starting time of the observation, T₀, in units of MJD. The x-axis has units of 10³ seconds after T₀. The values in the y-axis are the fluxes normalized by the average flux of the observation. Those visits with fewer than three exposures are not shown. On each panel, we also show the X-ray spectral types (see Sect. 5) proposed for each source.