There's a flash of neutrinos as the supernova core collapses and it precedes the light by a bit. One reason being the neutrinos don't really care there's a whol

There's a flash of neutrinos as the supernova core collapses and it precedes the light by a bit. One reason being the neutrinos don't really care there's a whole supernova in the way but EM radiation does. https://en.wikipedia.org/wiki/Supernova_neutrinos https://en.wikipedia.org/wiki/Supernova_neutrinos