Strong spectral evolution during the prompt emission of GRB 070616

Details Strong spectral evolution during the prompt emission of GRB 070616 Strong spectral evolution during the prompt emission of GRB 070616

2008-01-04

arxiv.org/abs/0801.0706v1

AIP Conf.Proc.1000:113-116,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures (Fig 1 in colour), contributed talk, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, New M

Scientific paper

10.1063/1.2943421

Swift has revealed features in GRB early light curves, such as steep decays and X-ray flares, whose properties are consistent with an internal origin though they are far from understood. The steep X-ray decay is often explained using the curvature effect; however a significant number of GRBs display strong spectral evolution during this phase, and a new mechanism must be invoked to explain this. Of particular interest are the longest duration GRBs in which the early emission can be studied in most detail. Here we present data for GRB 070616, in which the prompt emission shows a complex multipeaked structure, leading to one of the longest prompt emission durations ever recorded. We take advantage of extensive coverage of such a long burst by all Swift instruments. Combining data from Swift and Suzaku we study the evolution of the prompt emission spectrum, following the temporal variability of the peak energy and spectral slope.

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