Flashes (transients)?

https://www.geek.com/science/72-flashes-a-ah-astronomers-cant-place-mysterious-explosions-1735961/

Citando:
"A team of astronomers are struggling to explain the origin of 72 gone-in-a-flash cosmic events.

Six dozen transients spotted in data from the Dark Energy Survey Supernova Program (DES-SN) remain a mystery, according to findings presented at the European Week of Astronomy and Space Science.

Part of a global effort to understand dark energy, DES-SN uses the Cerro Tololo Inter-American Observatory in the Chilean Andes to search for supernovas—titanic explosions that mark the end of a massive star’s life."