088199

Radio and X-ray observations of supernovae openParSNeclosePar acquired in the poorly sampled phase of years to decades post-explosion are necessary to drive progress in several fundamental areas of explosive transient research. Bright emission virgulyears to decades post explosion of extragalactic SNe may be due to AclosePar shock-interaction with the circumstellar medium or BclosePar the emergence of radiation from a pulsar wind nebula. A solid identification of the scenarios above would lead to significant advances in our understanding of the physics of stellar explosions comma their progenitors comma and their remnants. We propose the first systematic late-time X-ray survey of SNe with bright detected radio emission.