Collapse of massive stars to neutron stars or black holes releases an enormous amount (1053 erg) of potential energy. For most normal supernovae (where the stellar core collapses down to a neutron star), the bulk of this energy escapes in the form of neutrinos. For the collapsar GRB model, the core collapses to a black hole and more energy is released, but much of the energy released flows directly into the black hole. Here we compare the neutrino signals from two simulations; one of a supernova (SN) explosion (neutron star collapse) and the other of a collapsar Gamma-Ray Burst (GRB) outburst (collapse to a black hole). These two signals could, in principal, allow us to distinguish between black-hole and neutron star formation in stellar collapse. We end by discussing how these different neutrino signals might affect neutrino-driven nucleosynthesis.
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