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The complex light curve of the afterglow of GRB071010A
Stockholm University, Faculty of Science, Department of Astronomy.
2008 (English)In: Monthly Notices of the Royal Astronomical Society, Vol. 388, no 1, 347-356 p.Article in journal (Refereed) Published
Abstract [en]

We present and discuss the results of an extensive observational campaign devoted to GRB071010A, a long-duration gamma-ray burst detected by the Swift satellite. This event was followed for almost a month in the optical/near-infrared (NIR) with various telescopes starting from about 2min after the high-energy event. Swift XRT observations started only later at about 0.4d. The light-curve evolution allows us to single out an initial rising phase with a maximum at about 7min, possibly the afterglow onset in the context of the standard fireball model, which is then followed by a smooth decay interrupted by a sharp rebrightening at about 0.6d. The rebrightening was visible in both the optical/NIR and X-rays and can be interpreted as an episode of discrete energy injection, although various alternatives are possible. A steepening of the afterglow light curve is recorded at about 1d. The entire evolution of the optical/NIR afterglow is consistent with being achromatic. This could be one of the few identified GRB afterglows with an achromatic break in the X-ray through the optical/NIR bands. Polarimetry was also obtained at about 1d, just after the rebrightening and almost coincident with the steepening. This provided a fairly tight upper limit of 0.9 per cent for the polarized-flux fraction.

Place, publisher, year, edition, pages
2008. Vol. 388, no 1, 347-356 p.
URN: urn:nbn:se:su:diva-18323DOI: doi:10.1111/j.1365-2966.2008.13393.xOAI: diva2:184846
Available from: 2009-01-25 Created: 2009-01-25 Last updated: 2011-01-10Bibliographically approved

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Olofsson, Göran
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Department of Astronomy

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