Abstract
We have used a simple method to estimate the prompt emission radii of 27 Swift and 37 pre-Swift long gamma-ray bursts with known redshift and jet break time. The prompt γ-rays are found to emit mainly from a beamed jet with dynamic open angle narrower than its geometric open angle, suggesting an obviously dynamic evolution from prompt to follow-up phases for the jetted outflow. Under condition of the external shock scenario, we confirm that long gamma-ray bursts are produced at a larger radius of ∼1016 cm, which puts a strict constraint on the currently theoretical models.
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Zhang, Z., Zhao, Y. & Zhang, Y. Where are the prompt emitting regions of long GRBs?. Astrophys Space Sci 333, 89–98 (2011). https://doi.org/10.1007/s10509-011-0620-2
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DOI: https://doi.org/10.1007/s10509-011-0620-2