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The complex light-curve of the afterglow of GRB071010A

Abstract : 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% for the polarized-flux fraction.
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Contributor : Simone Lantz <>
Submitted on : Monday, June 30, 2008 - 9:55:14 AM
Last modification on : Monday, November 9, 2020 - 4:40:07 PM

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S. Covino, P. d'Avanzo, A. Klotz, D. A. Perley, L. Amati, et al.. The complex light-curve of the afterglow of GRB071010A. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2008, 388, pp.347-356. ⟨10.1111/j.1365-2966.2008.13393.x⟩. ⟨in2p3-00291652⟩



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