The early time properties of GRBs: Canonical afterglows and the importance of prolonged central engine activity

A. Melandri; C. G. Mundell; S. Kobayashi; C. Guidorzi; D. Bersier; A. Gomboc; I. A. Steele; R. J. Smith; D. Carter; M. F. Bode

doi:10.1063/1.3155885

The early time properties of GRBs: Canonical afterglows and the importance of prolonged central engine activity

A. Melandri, C. G. Mundell, S. Kobayashi, C. Guidorzi, D. Bersier, A. Gomboc, I. A. Steele, R. J. Smith, D. Carter, M. F. Bode

Department of Physics

Research output: Chapter or section in a book/report/conference proceeding › Chapter in a published conference proceeding

Abstract

Using a new, comprehensive multiwavelength survey of 63 Gamma Ray Bursts (GRBs) with unprecedented temporal coverage, we classify the observed afterglows into four main classes and discuss the underlying physics that can explain them. The presence or absence of temporal breaks in X-ray and optical bands is used to examine the emission in the context of the standard model; a number of GRBs are shown to deviate from the forward shock model even with the inclusion of energy injection or ambient density gradients. We show that additional emission in the early-time X-ray afterglow due to late-time central engine activity is key and may explain both GRBs whose afterglows do not fit the standard model and those GRBs that appear to be optically dark even at early times.

Original language	English
Title of host publication	Gamma-Ray Burst - 6th Huntsville Symposium
Pages	227-228
Number of pages	2
Volume	1133
DOIs	https://doi.org/10.1063/1.3155885
Publication status	Published - 27 Nov 2009
Event	6th Huntsville Symposium on Gamma-Ray Bursts - Huntsville, AL, USA United States Duration: 20 Oct 2008 → 23 Oct 2008

Conference

Conference	6th Huntsville Symposium on Gamma-Ray Bursts
Country/Territory	USA United States
City	Huntsville, AL
Period	20/10/08 → 23/10/08

Keywords

Gamma-ray bursts
Gamma-ray sources

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.3155885

Cite this

Melandri, A, Mundell, CG, Kobayashi, S, Guidorzi, C, Bersier, D, Gomboc, A, Steele, IA, Smith, RJ, Carter, D & Bode, MF 2009, The early time properties of GRBs: Canonical afterglows and the importance of prolonged central engine activity. in Gamma-Ray Burst - 6th Huntsville Symposium. vol. 1133, pp. 227-228, 6th Huntsville Symposium on Gamma-Ray Bursts, Huntsville, AL, USA United States, 20/10/08. https://doi.org/10.1063/1.3155885

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abstract = "Using a new, comprehensive multiwavelength survey of 63 Gamma Ray Bursts (GRBs) with unprecedented temporal coverage, we classify the observed afterglows into four main classes and discuss the underlying physics that can explain them. The presence or absence of temporal breaks in X-ray and optical bands is used to examine the emission in the context of the standard model; a number of GRBs are shown to deviate from the forward shock model even with the inclusion of energy injection or ambient density gradients. We show that additional emission in the early-time X-ray afterglow due to late-time central engine activity is key and may explain both GRBs whose afterglows do not fit the standard model and those GRBs that appear to be optically dark even at early times.",

keywords = "Gamma-ray bursts, Gamma-ray sources",

author = "A. Melandri and Mundell, {C. G.} and S. Kobayashi and C. Guidorzi and D. Bersier and A. Gomboc and Steele, {I. A.} and Smith, {R. J.} and D. Carter and Bode, {M. F.}",

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doi = "10.1063/1.3155885",

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T2 - 6th Huntsville Symposium on Gamma-Ray Bursts

AU - Melandri, A.

AU - Mundell, C. G.

AU - Kobayashi, S.

AU - Guidorzi, C.

AU - Bersier, D.

AU - Gomboc, A.

AU - Steele, I. A.

AU - Smith, R. J.

AU - Carter, D.

AU - Bode, M. F.

PY - 2009/11/27

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N2 - Using a new, comprehensive multiwavelength survey of 63 Gamma Ray Bursts (GRBs) with unprecedented temporal coverage, we classify the observed afterglows into four main classes and discuss the underlying physics that can explain them. The presence or absence of temporal breaks in X-ray and optical bands is used to examine the emission in the context of the standard model; a number of GRBs are shown to deviate from the forward shock model even with the inclusion of energy injection or ambient density gradients. We show that additional emission in the early-time X-ray afterglow due to late-time central engine activity is key and may explain both GRBs whose afterglows do not fit the standard model and those GRBs that appear to be optically dark even at early times.

AB - Using a new, comprehensive multiwavelength survey of 63 Gamma Ray Bursts (GRBs) with unprecedented temporal coverage, we classify the observed afterglows into four main classes and discuss the underlying physics that can explain them. The presence or absence of temporal breaks in X-ray and optical bands is used to examine the emission in the context of the standard model; a number of GRBs are shown to deviate from the forward shock model even with the inclusion of energy injection or ambient density gradients. We show that additional emission in the early-time X-ray afterglow due to late-time central engine activity is key and may explain both GRBs whose afterglows do not fit the standard model and those GRBs that appear to be optically dark even at early times.

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KW - Gamma-ray sources

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M3 - Chapter in a published conference proceeding

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SN - 9780735406704

VL - 1133

SP - 227

EP - 228

BT - Gamma-Ray Burst - 6th Huntsville Symposium

Y2 - 20 October 2008 through 23 October 2008

ER -

The early time properties of GRBs: Canonical afterglows and the importance of prolonged central engine activity

Abstract

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Keywords

ASJC Scopus subject areas

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