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arXiv · 1102.4739

Spectral components in the bright, long GRB 061007: properties of the photosphere and the nature of the outflow

J. Larsson·F. Ryde·C. Lundman·S. McGlynn·S. Larsson·M. Ohno. K. Yamaoka
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Abstract

We present a time-resolved spectral analysis of the bright, long GRB 061007 (z=1.261) using Swift BAT and Suzaku WAM data. We find that the prompt emission of GRB 061007 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 emission 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 LAT bursts.

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J. Larsson, F. Ryde, C. Lundman, S. McGlynn, S. Larsson, M. Ohno. K. Yamaoka. 2011-02-23. Spectral components in the bright, long GRB 061007: properties of the photosphere and the nature of the outflow. https://doi.org/10.1111/j.1365-2966.2011.18582.x

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