An expanding ring of energy dissipation in a relativistic jet, lit by a brief engine pulse, can produce a long GRB prompt pulse with softer-wider and softer-later behavior, as observed in GRB 230307A.
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Long Pulse by Short Central Engine: Prompt emission from expanding dissipation rings in the jet front of gamma-ray bursts
An expanding ring of energy dissipation in a relativistic jet, lit by a brief engine pulse, can produce a long GRB prompt pulse with softer-wider and softer-later behavior, as observed in GRB 230307A.