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Spectral components in the bright, long GRB 061007: properties of the photosphere and the nature of the outflow
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2011 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 414, no 3, 2642-2649 p.Article in journal (Refereed) Published
Abstract [en]

We present a time-resolved spectral analysis of the bright, long GRB 061007 (z = 1.261) using Swift and Suzaku data. We find that the prompt emission of the burst can be equally well explained by a photospheric component together with a power law as by a Band function, and we explore the implications of the former model. The photospheric component, which we model with a multicolour blackbody, dominates the spectra and has a very stable shape throughout the burst. This component provides a natural explanation for the hardness-intensity correlation seen within the burst and also allows us to estimate the bulk Lorentz factor and the radius of the photosphere. The power-law component dominates the fit at high energies and has a nearly constant slope of -1.5. We discuss the possibility that this component is of the same origin as the high-energy power laws recently observed in some Fermi bursts.

Place, publisher, year, edition, pages
2011. Vol. 414, no 3, 2642-2649 p.
Keyword [en]
radiation mechanisms: general, gamma-ray burst: individual: GRB 061007
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-67002DOI: 10.1111/j.1365-2966.2011.18582.xISI: 000292977600065OAI: oai:DiVA.org:su-67002DiVA: diva2:470026
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authorCount :7Available from: 2011-12-28 Created: 2011-12-22 Last updated: 2017-12-08Bibliographically approved

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Larsson, JosefinLarsson, Stefan
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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