090259

1ES 1927+654 the first changing-look AGN caught in the act of changing phases has undergone extreme spectral changes over the last 3 years including the destruction and recreation of the X-ray corona possibly due to a tidal disruption event in a pre-existing AGN accretion disk. The latest XMM-Newton observation is similar to the pre-outburst observation from May 2011 but reveals a hint of an iron line which was notably missing in the 2011 observation. We propose one more simultaneous XMM-Newton/NuSTAR campaign of 1ES 1927+654 totaling 70 ks over two 35 ks observations to probe the late-stage evolution of this paradigm-defying AGN. The hard X-ray spectrum will allow us to track the heating of a newly-formed corona for the first time and determine whether the iron line has appeared. [truncated! Please see actual data for full text]