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M82 X-2 is the first pulsating ultraluminous X-ray source (PULX)to beidentified. Since the discovery in 2014, NuSTAR has observed the M82 field 15times throughout 2015 and 2016. In this paper, we report the results ofpulsation searches in all these datasets, and find only one new detection. Thisnew detection allows us to refine the orbital period of the source and measurean average spin down rate between 2014 and 2016 of 5x10^-11 Hz/s, which is incontrast to the strong spin up seen during the 2014 observations and representthe first detection of spin down in a PULX system. Thanks to the improvedorbital solution allowed by this new detection, we are also able to detectpulsations in additional segments of the original 2014 dataset. We find aglitch superimposed on the very strong and variable spin-up already reported,the first positive glitch identified in a PULX system. We discuss the newfindings in the context of current leading models for PULXs.

All at once: transient pulsations, spin down and a glitch from the Pulsating Ultraluminous X-ray Source M82 X-2