  Multi-frequency observations of two radio bright SNe (SN1993J, SN1979C)
carried out over a year with GMRT are presented. Their radio light curves trace
the evolution of the mass loss in the stellar wind before the pre-supernova
star exploded. Their spectra at low frequencies distinguish between the
synchrotron self-absorption and free-free absorption based models. Two very
similar type IIp SN1999gi and SN1999em were also observed and we comment on
their progenitor mass. These observations of different subclasses of
core-collapse supernovae will aid in defining their progenitors.
