GRB 080916C
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GRB 080916C is a gamma-ray burst that was recorded on September 16, 2008, in the Carina constellation and detected by NASA's Fermi Gamma-ray Space Telescope. It was the most powerful gamma-ray burst ever recorded, until GRB 221009A was recorded in... Wikipedia
Distance: 12,200,000,000 ly (3.7×109 pc)
Total energy output: 8.8×1054 ergs