If one goes off nearby (not expected by scientists, but they've only been observing them for a short while...) - this alert service might give you time to make it to a bunker!

World-wide, several detectors currently running or nearing completion are sensitive to a core collapse supernova neutrino signal in the Galaxy. The neutrino signal emerges promptly from a supernova's core, whereas it may take hours for the first photons to be visible. Therefore, the detection of the neutrino burst from the next Galactic supernova can provide an early warning for astronomers. Putting several detectors in coincidence can provide the astronomical community with a very high confidence early warning of the supernova's occurrence.

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Source: SNEWS