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.
Mena Requejo, Olga Mocioiu, Irina Quigg, Chris 2007 Gravitational lensing of supernova neutrinos Astroparticle Physics 28 3 348 356
