If 1058 neutrinos are expected to have carried 99 percent of the 1046 J of energy released in SN…

If 1058 neutrinos are expected to have carried 99 percent of the 1046 J of energy released in SN 1987A, how much energy of the star’s collapse did each neutrino carry? If only 19 neutrinos were detected from SN 1987A, where did the other neutrinos go? If no burst of neutrinos was detected from SN 2014J, which was discovered in mid-January 2014 in the M82 galaxy, what can you conclude?