Simultaneous Swift UVOT/XRT light curve, sampled at 1 s time resolution. The times here are offset from MJD 58192.06938191 UTC, without barycentric correction. The v-band light curve has been renormlised and offset for clarity.
Swift Optical (v-band) vs. X-ray (0.3-10 keV) discrete cross-correlation of the 1s binned light curves, averaged over six independent segments.