V404 Cyg Optical/X-ray correlation on 2015 Jun 21


A simultaneous light curve section, sampled at 5 s time resolution. The times here are in raw MJD after 57194.1530540, without barycentric correction. Light curves have been normalised to the mean count rate.


Swift Optical (U-band) vs. X-ray (0.3-10 keV) CCF computed from the barycentric light curves.