https://www.scientificamerican.com/article/record-breaking-gamma-rays-reveal-secrets-of-the-universes-most-powerful-explosions/

The most powerful explosions in the universe just got even more potent, two teams of astronomers report today in Nature.

Almost every day, without warning, gamma-ray bursts (GRBs) wash over Earth from somewhere in the vast depths of the cosmos. Each is thought to signal the cataclysmic birth of a black hole, through either the collapse of a massive star or the merging of neutron stars. Because a typical GRB emits in mere seconds more energy than our sun will produce across its entire 10-billion-year lifetime, it can be seen across almost the entirety of the visible universe.