Journal Article

The unusual X-ray light curve of GRB 080307: the onset of the afterglow?

K. L. Page, R. Willingale, P. T. O'Brien, N. R. Tanvir, J. P. Osborne, B. Zhang, S. T. Holland, A. J. Levan, A. Melandri, R. L. C. Starling, D. Bersier, D. N. Burrows, J. E. Geach and P. Maxted

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 1, pages 328-334
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI:
The unusual X-ray light curve of GRB 080307: the onset of the afterglow?

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Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light curve around 100 s after the burst, at the start of which the emission briefly softened. This ‘hump’ has a longer duration than is normal for a flare at early times and does not demonstrate a typical flare profile. Using a two-component power-law-to-exponential model, the rising emission can be modelled as the onset of the afterglow, something which is very rarely seen in Swift-X-ray light curves. We cannot, however, rule out that the hump is a particularly slow early-time flare, or that it is caused by upscattered reverse shock electrons.

Keywords: radiation mechanisms: non-thermal; gamma-rays: bursts; X-rays: individual: GRB 080307

Journal Article.  5267 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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