2004/07/21 by E. W. Liang, En‐Wei Liang, Xue-Feng Wu +3 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2004.08164.x
6 pages including 4 figures, MNRAS in press
arxiv created 2004/07/21 · openalex publication_date 2004/10/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Based on the standard energy reservoir of gamma‐ray burst (GRB) jets and the relationship between the peak energy (Ep) of the νFν spectrum and the equivalent isotropic energy (Eiso), we test the GRB probability distributions as a function of viewing angle (θ) and of viewing angle together with redshift (z), P(θ) and P(θ, z), predicted by the universal structured jet (USJ) model with simulations on observational bases for a detection threshold of S > 4 × 10−5 erg cm−2, where S is the total fluence in an energy band >20 keV. We simulate a sample including 106 GRBs, and then derive P(θ) and P(θ, z). We show that both simulated and theoretical P(θ) and P(θ, z) are consistent with each other. This consistency seems to be regarded as support for the USJ model. A small difference between the theoretical and simulated results might be due to the observed Ep distribution used in our simulations, which perhaps suffers a little of biases for Ep < 100 keV.