A warning system for when stars go supernova

In Oblivion, humanity is attempting to recover from a narrowly won war with an alien species. We survived, but the planet is wrecked and the only hope — at least according to the authorities — is to leave Earth behind. As the movie opens, that’s what we think is happening. In truth, the conflict is ongoing. The space station ferrying humanity off-world is actually an alien craft stealing the last of humanity’s resources before they leave.
Scientists have devised a supernova warning system, a way of detecting supernovae before they happen.

Astronomers See the Exact Moment a Supernova Turned into a Black Hole (or Neutron Star) - Universe Today

Scientists are keep watch in case Betelgeuse explodes as a supernova

Rosetta Stone of Supernovas': Exploding Star Seen in Real Time Astronomers are calling it the “Rosetta Stone of supernovas,” as it could lead to an early warning system for doomed stars.

What's a safe distance from a supernova for Earth?

A warning system for when stars go supernova

This Early Warning Signal Could Successfully Predict Betelgeuse's Supernova

A massive star dies without a bang, revealing the sensitive nature of supernovae

When Betelgeuse goes supernova, what will it look like from Earth?

Do stars always supernova when they die? - Quora

Astronomers Identified What Stars Look Like Before They Die, Developing Early Warning System for Supernova

Astronomers Think They Have a Warning Sign for When Massive Stars are About to Explode as Supernovae - Universe Today

When Betelgeuse goes supernova, what will it look like from Earth?

The scientists who are hoping Betelgeuse goes supernova

Scaled-Up Version Of Solar System Discovered Around Star That Will Go Supernova

NASA's Webb telescope captures fleeting moment of a star before going supernova - CBS News