A Study of circumstellar interaction of Extragalactic Supernovae

Circumstellar interaction of the shocked ejecta gives rise to emission in radio and X-ray bands. Observations of young supernovae in these wave bands unravel the aspects of circumstellar interaction such as the mass loss rate from the pre-explosion progenitor star and the structure of the outer region of the supernova, between the blast wave shock and the reverse shock. I present here the observations of few young extragalactic supernovae observed with GMRT and discuss their radio mechanisms. I also discuss the origin of prompt X-ray emission from SN 2002ap observed with GMRT as well as XMM_Newton telescope as a Target of Opportunity source.