Beaming in gamma-ray bursts: Evidence for a standard energy reservoir

被引：1068

作者：

Frail, DA

Kulkarni, SR

Sari, R

Djorgovski, SG

Bloom, JS

Galama, TJ

Reichart, DE

Berger, E

Harrison, FA

Price, PA

Yost, SA

Diercks, A

Goodrich, RW

Chaffee, F

机构：

[1] Natl Radio Astron Observ, Socorro, NM 87801 USA

[2] CALTECH, Palomar Observ, Pasadena, CA 91125 USA

[3] Mt Stromlo & Siding Spring Observ, Sch Astron & Astrophys, Weston, ACT 2611, Australia

[4] WM Keck Observ, Kamuela, HI 96743 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 562卷 / 01期

关键词：

gamma rays : bursts; ISM : jets and outflows; shock waves;

D O I：

10.1086/338119

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a comprehensive sample of all gamma-ray burst (GRB) afterglows with known distances, and we derive their conical opening angles based on observed broadband breaks in their light curves. Within the framework of this conical jet model, we correct for the geometry and we find that the gamma-ray energy release is narrowly clustered around 5 x 10(50) ergs. We draw three conclusions. First, the central engines of GRBs release energies that are comparable to ordinary supernovae. Second, the broad distribution in fluence and luminosity for GRBs is largely the result of a wide variation of opening angles. Third, only a small fraction of GRBs are visible to a given observer, and the true GRB rate is several hundred times larger than the observed rate.

引用

页码：L55 / L58

页数：4

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