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We report the detection of a $78.1\pm0.5$ day period in the X-ray lightcurveof the extreme ultraluminous X-ray source NGC 5907 ULX1($L_{\rm{X,peak}}\sim5\times10^{40}$ erg s$^{-1}$), discovered during anextensive monitoring program with Swift. These periodic variations are strong,with the observed flux changing by a factor of $\sim$3-4 between the peaks andthe troughs of the cycle; our simulations suggest that the observed periodicityis detected comfortably in excess of 3$\sigma$ significance. We discusspossible origins for this X-ray period, but conclude that at the current timewe cannot robustly distinguish between orbital and super-orbital variations.

A 78 Day X-ray Period Detected from NGC 5907 ULX1 by Swift