Naked-eye optical flash from gamma-ray burst 080319B: Tracing the decaying neutrons in the outflow
نویسندگان
چکیده
For an unsteady baryonic gamma-ray burst (GRB) outflow, the fast and slow proton shells collide with each other and produce energetic soft gamma-ray emission. If the outflow has a significant neutron component, the ultrarelativistic neutrons initially expand freely until decaying at a larger radius. The latetime proton shells ejected from the GRB central engine, after powering the regular internal shocks, will sweep these -decay products and give rise to very bright UV/optical emission. The naked-eye optical flash from GRB 080319B, an energetic explosion in the distant Universe, can be well explained in this way.
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