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Both in Type II Supernovae and in Gamma Ray Bursts, neutrinos play many important roles. I will focus on their role in determining element synthesis from these two astrophysical objects. In the supernovae, neutrinos are emitted from a neutrino sphere in the core, and subsequently influence certain types of nucleosynthesis, such as the r-process. In the case of a Gamma Ray Bursts, there is likely an accretion disk surrounding a black hole, which also produces neutrinos that influence nucleosynthesis products such as nickel and other iron peak elements.
