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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publicationGamma-Ray Burst - 6th Huntsville Symposium
Pages227-228
Number of pages2
Volume1133
DOIs
Publication statusPublished - 27 Nov 2009
Event6th Huntsville Symposium on Gamma-Ray Bursts - Huntsville, AL, USA United States
Duration: 20 Oct 200823 Oct 2008

Conference

Conference6th Huntsville Symposium on Gamma-Ray Bursts
CountryUSA United States
CityHuntsville, AL
Period20/10/0823/10/08

Keywords

  • Gamma-ray bursts
  • Gamma-ray sources

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Melandri, A., Mundell, C. G., Kobayashi, S., Guidorzi, C., Bersier, D., Gomboc, A., Steele, I. A., Smith, R. J., Carter, D., & Bode, M. F. (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) https://doi.org/10.1063/1.3155885