Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2009-05, Vol.395 (1), p.328-334

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2009

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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.