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GRB 221009A with an Unconventional Precursor: A Typical Two-stage Collapsar Scenario?
Abstract As the brightest gamma-ray burst (GRB) ever detected, GRB 221009A may offer a chance that reveals some interesting features that are hidden in those bursts that are not so bright. There seems to be a very weak emission with a flux of 10 −8 ∼ 10 −7 erg cm …