What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?

supermassive stars
201
quasars
817
gamma-ray burst
1435
supernova
1843
Gamma-ray bursts are the brightest in the universe, even brighter than the glare of quasars, second only to the brightness and power of the Big Bang. It is believed that arise during disruption of stars by black holes.
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Krzysztof Moskal
reach: rather globalastronomystarsuniverse