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11.5. Low Energy Neutrinos

Most of the energy generated in any core collpase event and in particular in NS2M is released as low energy (~ 5 - 10 MeV) neutrinos [277]. The total energy is quite large ~ a few × 1053 ergs, leading to flow energy nu-gamma approx 10. However, this neutrino signal will be quite similar to a supernova neutrino signal, and at present only galactic SN neutrinos can be detected. Supernovae are ten thousand times more frequent then GRBs and therefore low energy neutrinos associated with GRB constitute an insignificant contribution to the background at this energy range.