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, P. Maxted

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)328-334
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume395
Issue number1
DOIs
StatePublished - May 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    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. (2009). The unusual X-ray light curve of GRB 080307: The onset of the afterglow? Monthly Notices of the Royal Astronomical Society, 395(1), 328-334. https://doi.org/10.1111/j.1365-2966.2009.14509.x