https://www.smithsonianmag.com/science-nature/when-will-the-next-supernova-in-our-galaxy-occur-180980422/

“If the star is close enough, we actually might be able to observe some of these early pre-supernova neutrinos before the core-collapse actually happens,” says Scholberg.

For example, if the red giant star Betelgeuse were to go supernova, neutrino detectors would likely pick up the signal hours or even days before the explosion itself became visible, she says.

(Betelgeuse has been fluctuating in brightness in recent years, and some astronomers suggested it was on the verge of blowing up, but more recent studies suggest the dimming was caused either by clouds of dust or by sunspot activity on the star’s surface. Nonetheless, the giant star is expected to blow up sometime in the next 100,000 years.)

If neutrinos from a galactic supernova reach the Earth, astronomers will receive an automatic alert sent out by an array of neutrino detectors known as the Supernova Early Warning System, or SNEWS.

Scholberg helped develop the first version of SNEWS in the early 2000s; today astronomers are ramping up “SNEWS 2.0” which will serve the same function as its predecessor but with improved triangulation ability, The network will use data from seven different detectors—located in six different countries plus Antarctica—to determine the supernova’s approximate direction in the sky, so that optical instruments can take a closer look."

If you believe any/all of the above + the spam about it, get yourself an alert

https://snews.bnl.gov/alert.html