A Brief Review of the Amati Relation for GRBs

Azzam, Walid J.

doi:10.4236/ijaa.2016.64030

Cited by 4 publications

(1 citation statement)

References 40 publications

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“…In Amati's original study [5], the following values were obtained: m ≈ 0.5 and K ≈ 95. However, more recent studies [23] [24] [25] [26] [27] found mean values of <m> = 0.45 and <K> = 141. Another important peak-energy correlation is the Ghirlanda relation, which is a correlation between the peak energy and the total energy corrected for beaming, E γ , which is given by: ( )…”

Section: Peak Energy Correlations and The Amati Relationmentioning

confidence: 99%

An Amati-Like Correlation for Short Gamma-Ray Bursts

Azzam¹,

Jaber²,

Naeem³

2020

JAMP

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Gamma-ray bursts (GRBs) are by far the most powerful explosions in the universe. Over the past two decades, several GRB energy and luminosity correlations were discovered for long gamma-ray bursts, which are bursts whose observed duration exceeds 2 seconds. One important correlation, the Amati relation, involves the observed peak energy, E p,obs , in the νF ν spectrum and the equivalent isotropic energy, E iso . For many years, it was believed that the Amati correlation applied only to long GRBs. In this paper, we use a recent data sample that includes both long and short GRBs to re-examine the issue of whether the Amati correlation applies to long GRBs only. Our results indicate that although short bursts do not follow the Amati relation in the strict sense, they do exhibit a correlation between the intrinsic peak energy, E p,i , and E iso that is very similar to the Amati relation but with a different normalization and slope. The paper also discusses the physical interpretation of this correlation in the context of the internal shock model.

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Section: Peak Energy Correlations and The Amati Relationmentioning

confidence: 99%

An Amati-Like Correlation for Short Gamma-Ray Bursts

Azzam¹,

Jaber²,

Naeem³

2020

JAMP

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A Backscattering-dominated Prompt Emission Model for the Prompt Phase of Gamma-Ray Bursts

Vyas

Pe’er

Eichler

2021

ApJ

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As a gamma-ray burst (GRB) jet drills its way through the collapsing star, it traps a baryonic “cork” ahead of it. Here we explore a prompt emission model for GRBs in which the jet does not cross the cork, but rather photons that are emitted deep in the flow largely by pair annihilation are scattered inside the expanding cork and escape largely from the back end of it as they push it from behind. Due to the relativistic motion of the cork, these photons are easily seen by an observer close to the jet axis peaking at ε peak ∼ few ×100 keV. We show that this model naturally explains several key observational features: (1) a high-energy power-law index β 1 − 2 to − 5 with an intermediate thermal spectral region; (2) decay of the prompt emission light curve as ∼ t −2; (3) delay of soft photons; (4) a peak energy–isotropic energy (the so-called “Amati”) correlation, ε peak ∼ ε iso m , with m ∼ 0.45, resulting from different viewing angles (at low luminosities, our model predicts an observable turnoff in the Amati relation); (5) an anticorrelation between the spectral FWHM and time as t −1; (6) temporal evolution ε peak ∼ t −1; and (7) distribution of peak energies ε peak in the observed GRB population. The model is applicable for single-pulse GRB light curves and their respective spectra. We discuss the consequences of our model in view of current and future prompt emission observations.

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Peak Energy Correlations for Gamma-Ray Bursts

Azzam¹

2017

JAMP

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Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. Over the past two decades, several GRB energy and luminosity correlations were discovered. These correlations typically involve an observable parameter, like the observed peak energy, E p,obs , and a non-observable quantity, like the equivalent isotropic energy, E iso . This paper provides a brief review of GRB peak energy correlations. Specifically, it focuses on the Amati relation, which correlates E p,obs and E iso , and the Ghirlanda relation, which correlates E p,obs and E γ , the total energy corrected for beaming. The paper also discusses the physical interpretation of these relations in the context of the internal shock model.

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A Brief Review of the Amati Relation for GRBs

Cited by 4 publications

References 40 publications

An Amati-Like Correlation for Short Gamma-Ray Bursts

An Amati-Like Correlation for Short Gamma-Ray Bursts

A Backscattering-dominated Prompt Emission Model for the Prompt Phase of Gamma-Ray Bursts

Peak Energy Correlations for Gamma-Ray Bursts

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