Аннотация:We analyzed the neutrino burst from the supernova 1987A detected by the Kamiokande II collaboration, and obtained the following results. (1) The total energy of antineutrinos is about 4.8\ifmmode\times\else\texttimes\fi{}${10}^{52}$ ergs, which is consistent with theoretical predictions. If we take Wilson's group simulation as the theoretical model, it corresponds to the models with the progenitor mass 15${M}_{\ensuremath{\bigodot}}$. (2) The first two neutrino events cannot correspond to the predicted initial neutronization burst from the energetics and the duration time. (3) The duration time of the burst suggests that the electron-neutrino mass <26 eV. We also discussed implications on the explosion mechanism of the supernova.
