Variability in gamma-ray bursts: A clue

Reem Sari; Tsvi Piran

doi:10.1086/304428

Variability in gamma-ray bursts: A clue

Reem Sari^*, Tsvi Piran

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

280 Scopus citations

Abstract

We show that external shocks cannot produce a variable gamma-ray burst, unless the burst is produc-ed by an extremely narrow jet (angular opening of ≲ 10^-4) or if only a small fraction of the shell emits the radiation and the process is very inefficient. Internal shocks can produce the observed complex tem-poral structure provided that the source itself is variable. In this case, the observed temporal structure reflects the activity of the "inner engine " that drives the bursts. This sets direct constraints on it.

Original language	English
Pages (from-to)	270-273
Number of pages	4
Journal	Astrophysical Journal
Volume	485
Issue number	1 PART I
DOIs	https://doi.org/10.1086/304428
State	Published - 1997

Keywords

Gamma rays: bursts
Hydrodynamics
Relativity
Shock waves

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10.1086/304428

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AB - We show that external shocks cannot produce a variable gamma-ray burst, unless the burst is produc-ed by an extremely narrow jet (angular opening of ≲ 10-4) or if only a small fraction of the shell emits the radiation and the process is very inefficient. Internal shocks can produce the observed complex tem-poral structure provided that the source itself is variable. In this case, the observed temporal structure reflects the activity of the "inner engine " that drives the bursts. This sets direct constraints on it.

KW - Gamma rays: bursts

KW - Hydrodynamics

KW - Relativity

KW - Shock waves

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JO - Astrophysical Journal

JF - Astrophysical Journal

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Variability in gamma-ray bursts: A clue

Abstract

Keywords

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