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. Kuepcue Yoldas, K. Misra, G. Olofsson, G. Tagliaferri, L. A. Antonelli, E. Berger, J. S. Bloom, M. BoeerC. 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

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


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 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 phasewith 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 0.6 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.

Original languageEnglish
Pages (from-to)347-356
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 21 Jul 2008
Externally publishedYes


  • methods : observational
  • gamma-rays : bursts
  • X-rays : individual : GRB071010A


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