Neutrinos from SN1987A: a reanalysis of the angular distribution

We reanalyze the neutrino events from SN1987A and compare them with the expectations from simple theoretical models of neutrino emission. The assumption that a few events have been caused by elastic scattering is not in contrast with the 'standard' picture of the collapse, and yields a more satisfactory angular distribution. The mean energy of electron antineutrinos is in the range E=12−15 MeV and the total energy radiated in the range (2−5)×1053 erg. These values are not in disagreement with those suggested by current theoretical paradigm, but leave wide space to non-standard pictures, especially when neutrino oscillations are included.