Abstract

Neutrinos from a presupernova star will be observed by current and future neutrino detectors if a nearby supernova at a few hundred parsec from the earth occurs. The events of neutrinos produced through pair-neutrino process are expected to be a few to hundreds depending on stellar mass, neutrino mass hierarchy, and detectors. The neutrino events can be applied to an alarm of the supernova. The supernova alarm will be sent before a few to more than ten hours before the supernova explosion by KamLAND. If hundreds neutrino events are observed by JUNO, the time variation of the burning processes in the central core of the presupernova star can be analyzed from the neutrino events.

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