"Supernova 1987a, History of the IMB Discovery"
 =============================================

170,000 years ago a large star, Sandulek, in the Large Magellanic Cloud, 
underwent gravitational collapse, sending a 10-second wide pulse of neutrinos 
out into the Universe. This pulse hit the Earth on 23 February, 1987, 
around UT 04:00, when 3X10**15 neutrinos went through the IMB detector. 
Six months before, the detector had been upgraded to increase it's 
photocathode coverage by a factor of four. 
This gave it just enough sensitivity to record eight neutrino events. 
Was this just dumb luck?