Newslink: First-Ever Image of a Terrestrial Gamma-Ray Burst Shows Light Exploding Out of a Thundercloud in Asia

Gamma-rays are the highest-energy form of light in the universe. They burst out of distant galaxies following some of space's most extreme events — massive suns exploding, hyper-dense neutron stars crashing into one another, black holes gobbling up worlds of matter, etc. — and, when they do, their glow briefly outshines every other light in the sky. (That is, if you can catch them with a gamma-ray telescope.)

https://www.space.com/first-terrestrial-gamma-ray-burst-image.html