Vol 10, No 2 (2010) / Gao

GRB jet beaming angle statistics

Yan Gao, Zi-Gao Dai


Existing theory and models suggest that a Type I (merger) GRB should have a larger jet beaming angle than a Type II (collapsar) GRB, but so far no statistical evidence is available to support this suggestion. In this paper, we obtain a sample of 37 beaming angles and calculate the probability that this is true. A correction is also devised to account for the scarcity of Type I GRBs in our sample. The probability is calculated to be 83% without the correction and 71% with it.



gamma rays: bursts— ISM: jets and outflows— methods: statistical

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