by Long gamma-ray bursts are bright flashes of extragalactic gamma rays produced during the collapse of a massive star.
A gamma-ray burst itself lasts only a few seconds but is followed by an afterglow that can persist for hours or days.
Astronomers using the High Energy Stereoscopic System (H.E.S.S.), an array of five gamma-ray telescopes located in Namibia, have now observed the afterglow of GRB 190829A, a nearby long gamma-ray burst.
Source
A gamma-ray burst itself lasts only a few seconds but is followed by an afterglow that can persist for hours or days.
Astronomers using the High Energy Stereoscopic System (H.E.S.S.), an array of five gamma-ray telescopes located in Namibia, have now observed the afterglow of GRB 190829A, a nearby long gamma-ray burst.
Source
