"Ground-based telescopes, like the Anglo-Australian Observatory, saw the light from supernova 1987A several hours after the Kamiokande and IMB experiments had already detected the neutrinos that were emitted."
http://ctp.berkeley.edu/neutrino/neutrino.html
Kamiokande experiment is also credited with discovering neutrino mass.
http://hitoshi.berkeley.edu/neutrino/PhysicsWorld.pdf
It leaves the impression that neutrinos are allowed to have mass and travel at light speed, which is not observed for any other particle.
Do Neutrinos Move At Light Speed And Have Mass?
Hi Jerry,
The neutrinos have a small mass, less than 1eV, but they are formed in the first few seconds of the explosion with kinetic energies in the 10 to 30 MeV range so they move at almost the speed of light. The optical emission is from the fireball of the explosion which is a sphere of hot gas expanding over weeks. We see it as a disc so for a given surface brightness, the luminosity would increase as he square of the radius. Of course it cools as it expands and radioactive decay of the material is feeding in more energy so the light curve is much more complex but basically it takes a few hours for the fireball to become bright enough to be seen.
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