TL;DR
This study analyzes the distribution of jet beaming angles in gamma-ray bursts (GRBs) to statistically test whether Type I (merger) GRBs have larger angles than Type II (collapsar) GRBs, providing probabilistic evidence for this hypothesis.
Contribution
It offers the first statistical analysis of GRB beaming angles distinguishing between Type I and Type II, including a correction for sample bias.
Findings
83% probability that Type I GRBs have larger beaming angles without correction.
71% probability after accounting for sample scarcity of Type I GRBs.
Sample of 37 beaming angles analyzed.
Abstract
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.
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