Covino 2008 GRB071010A的复杂光变

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· arXiv e-print (arXiv:0804.4367)

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Title:		The complex light-curve of the afterglow of GRB071010A
Authors:		Covino, S.; D'Avanzo, P.; Klotz, A.; Perley, D. A.; Amati, L.; et al
Publication:		eprint arXiv:0804.4367
Publication Date:		04/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		11 pages, 3 figures, MNRAS, in press
Bibliographic Code:		2008arXiv0804.4367C

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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