Gravitational Lensing of Supernova Neutrinos
  The black hole at the center of the galaxy is a powerful lens for supernova neutrinos. In the very special circumstance of a supernova near the extended line of sight from Earth to the galactic center, lensing could dramatically enhance the neutrino flux at Earth and stretch the neutrino pulse. 
Olga Mena, Irina Mocioiu, Chris Quigg