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Title:
The unusual X-ray light curve of GRB080307: the onset of the afterglow?
Authors:
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.
Affiliation:
AA(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AB(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AC(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AD(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AE(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AF(Department of Physics, University of Nevada, Las Vegas, NV 89154, USA), AG(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; Universities Space Research Association 10211 Wincopin Circle, Suite 500, Columbia, MD 21044-3432, USA), AH(Department of Physics, University of Warwick, Coventry CV4 7AL), AI(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD), AJ(X-Ray and Observational Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AK(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD), AL(Department of Astronomy and Astrophysics, Pennsylvania State University, State College, PA 16802, USA), AM(Department of Physics, Durham University, Durham DH1 3LE), AN(Astrophysics Group, Keele University, Keele ST5 5BG)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 395, Issue 1, pp. 328-334. (MNRAS Homepage)
Publication Date:
05/2009
Origin:
MNRAS
MNRAS Keywords:
radiation mechanisms: non-thermal , gamma-rays: bursts , X-rays: individual: GRB080307
DOI:
10.1111/j.1365-2966.2009.14509.x
Bibliographic Code:
2009MNRAS.395..328P

Abstract

Swift-detected GRB080307 showed an unusual smooth rise in its X-ray light curve around 100s 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.
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