Journal Article

The complex light curve of the afterglow of GRB 071010A*

S. Covino, P. D'Avanzo, A. Klotz, D. A. Perley, L. Amati, S. Campana, G. Chincarini, A. Cucchiara, V. D'Elia, D. Guetta, C. Guidorzi, D. A. Kann, A. Küpcü Yoldaş, K. Misra, G. Olofsson, G. Tagliaferri, L. A. Antonelli, E. Berger, J. S. Bloom, M. Böer, C. Clemens, F. D'Alessio, M. Della Valle, S. Di Serego Alighieri, A. V. Filippenko, R. J. Foley, D. B. Fox, D. Fugazza, J. Fynbo, B. Gendre, P. Goldoni, J. Greiner, D. Kocevksi, E. Maiorano, N. Masetti, E. Meurs, M. Modjaz, E. Molinari, A. Moretti, E. Palazzi, S. B. Pandey, S. Piranomonte, D. Poznanski, N. Primak, P. Romano, E. Rossi, R. Roy, J. M. Silverman, L. Stella, G. Stratta, V. Testa, S. D. Vergani, F. Vitali and F. Zerbi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 1, pages 347-356
Published in print July 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2008.13393.x
The complex light curve of the afterglow of GRB 071010A*

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We present and discuss the results of an extensive observational campaign devoted to GRB 071010A, 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 2 min after the high-energy event. Swift XRT observations started only later at about 0.4 d. The light-curve evolution allows us to single out an initial rising phase with a maximum at about 7 min, 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 0.6 d. 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 1 d. 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 1 d, 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.

Keywords: methods: observational; gamma-rays: bursts; X-rays: individual: GRB 071010A

Journal Article.  7387 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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