They are thought to be the result of massive stars collapsing into black holes. (sciencedaily.com)
The bursts are believed to be massive stars collapsing into black holes, among the biggest fireworks in the cosmos. (discovermagazine.com)
These bright bursts of radiation are normally the result of the dense core of a dead star blowing up or a gigantic star collapsing in on itself. (newscientist.com)