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Supernovae provide a backdrop from which we can probe the end state ofstellar evolution in the final years before the progenitor star explodes. Asthe shock from the supernova expands, the timespan of mass loss history we areable to probe also extends, providing insight to rapid time-scale processesthat govern the end state of massive stars. While supernovae transition intoremnants on timescales of decades to centuries, observations of this phase arecurrently limited. Here we present observations of SN 1970G, serendipitouslyobserved during the monitoring campaign of SN 2011fe that shares the same hostgalaxy. Utilizing the new Jansky Very Large Array upgrade and a deep X-rayexposure taken by the Chandra Space Telescope, we are able to recover thismiddle-aged supernova and distinctly resolve it from the HII cloud with whichit is associated. We find that the flux density of SN 1970G has changedsignificantly since it was last observed - the X-ray luminosity has increasedby a factor of ~3, while we observe a significantly lower radio flux of only27.5 micro-Jy at 6.75 GHz, a level only detectable through the upgrades now inoperation at the Jansky Very Large Array. These changes suggest that SN 1970Ghas entered a new stage of evolution towards a supernova remnant, and we may bedetecting the turn-on of the pulsar wind nebula. Deep radio observations ofadditional middle-aged supernovae with the improved radio facilities willprovide a statistical census of the delicate transition period betweensupernova and remnant.

A Mid-life crisis? Sudden Changes in Radio and X-Ray Emission from Supernova 1970G