2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138947The method of the statistical sample moments was used for the analysis of neutrino events from SN1987A burst in Cherenkov detectors. In particular the coefficients of correlation $Q(E,t)$ between the energies $E$ of electron antineutrinos $\bar ν_e$ emitted by star and the ejection instants $t$ of $\bar ν_e$ for neutrino events recorded by Cherenkov water detectors of KII and IMB collaborations were calculated. $Q(E,t)$ values depend on the assumed mass of $\bar ν_e$. Modern model of the gravitational stellar core collapse with an accretion phase predicts the low level of such correlation $<Q(E,t)>$ averaged with respect to neutrino burst. On condition that empirical $Q(E,t)$ values equal the theoretical model quantities $<Q(E,t)>$ one can obtain $22\pm10 eV/c^{2}$ as an estimate of the nonzero $\bar ν_e$ mass. The error of this estimate implies that $\bar ν_e$ mass less than $2 eV/c^2$ is unlikely. The laboratry data of the tritium $β$-decay agree adequately with the presented astrophysical estimate provided that the anomalous structure near the end point of $β$-spectrum is taken into account.12 pages, 4 figuresAstrophysicstext