GRB Jet Beaming Angle Statistics

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.

9 pages, 4 figures, accepted by Research in Astronomy and Astrophysics(RAA)

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• Electrons' energy in GRB afterglows implied by radio peaks
• A comprehensive statistical study on gamma-ray bursts
• Statistical Study of the Swift X-ray Flash and X-ray Rich Gamma-Ray Bursts
• The Absolute Rate of LGRB Formation
• An Off-Axis Relativistic Jet Model for the Type Ic supernova SN 2007gr
• The shallow-decay phase in both optical and x-ray afterglows of Swift GRB 090529A: Energy injection into a wind-type medium?
• Detecting the imprint of a kilonova or supernova \\ in short GRB afterglows
• Measuring the beaming angle of GRB 030329 by fitting the rebrightenings in its multiband afterglow