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The soft X-ray landscape of gamma-ray bursts: thermal components

Published online by Cambridge University Press:  05 September 2012

Rhaana Starling ,
Kim Page  and
Martin Sparre
Rhaana Starling
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK email: rlcs1@le.ac.uk; klp5@le.ac.uk Royal Society Dorothy Hodgkin Fellow
Kim Page
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK email: rlcs1@le.ac.uk; klp5@le.ac.uk
Martin Sparre
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK email: rlcs1@le.ac.uk; klp5@le.ac.uk Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark email: sparre@dark-cosmology.dk
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Abstract

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The repository of GRB (gamma-ray burst) observations made by the Swift X-ray Telescope, now consisting of over 650 bursts, is a valuable and unique resource for the study of GRB X-ray emission. The observed soft X-ray spectrum typically arises from an underlying power law continuum, absorbed by gas along the line-of-sight. However, particularly at early times in a burst's evolution the continuum emission is not always understood and may comprise multiple components including thermal emission unexpected in the standard model. A thermal X-ray component has been discovered in two very unusual GRBs, perhaps suggesting an association only with this subset of events. However, evidence exists for thermal emission from more typical examples and here we present a new discovery of one such case and describe a systematic search for thermal components among all early GRB X-ray spectra.

Keywords

gamma rays: burstsX-rays: bursts
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S279: Death of Massive Stars: Supernovae and Gamma-Ray Bursts , April 2011 , pp. 175 - 182
Copyright
Copyright © International Astronomical Union 2012

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