  We present high-sensitivity, high-resolution images of the Ultraluminous
Infrared Galaxies (ULIRG; L$_{\mathrm{FIR}} > 10^{12}$ L$_\odot$) IRAS
23365+3604 and IRAS 07251-0248, taken with the EVN at 6 and 18 cm. The images
show a large number of compact components, whose luminosities are typical of
Type IIL and Type IIn Radio Supernovae (RSNe). Further observations of these
ULIRGs will allow us to confirm, or to rule out, their nature. The present
observations are part of a project that should result in a significant number
of SN detections, providing a direct measurement of the Core Collapse Superova
(CCSN) rate and allowing us to estimate the Star Formation Rate (SFR) in our
sample of ULIRGs .
