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The results of twenty-year-long Galactic observations in neutrino radiationare summarized. Except for the recording of a neutrino signal from thesupernova SN 1987A, no Galactic bursts of collapse neutrinos have beendetected. An upper bound on the mean frequency of gravitational collapses inour Galaxy was obtained, $f_{collapse} (90% {confidence}) < 0.13 {yr}^{-1}$.Comment: latex, 7 pages, 2 eps figure

Twenty years of Galactic observations in searching for bursts of collapse neutrinos with the Baksan underground scintillation telescope