Rising optical afterglows seen by TAROT

B. Gendre (1) , A. Klotz (2) , G. Stratta (3) , B. Preger (3) , L. Piro (4) , A. Pelangeon (5) , A. Galli (4) , S. Cutini (3)

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A. Corsi (4) M. Boer (6) J.L. Atteia ((1) LAM/CNRS/Universite de Provence (2) CESR/CNRS/UPS (3) ASDC (4) IASF-Roma (5) LATT/CNRS (6) OHP/CNRS)

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classification 🌌 astro-ph

keywords opticalcurveslightrisingtarottimex-rayafterglow

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We present the multi-wavelength study of those gamma-ray bursts observed by TAROT. These events are characterized by the presence at early time of a rising in their optical light curves lasting a few hundred of seconds. In one case (GRB 060904B), a flare occurs at similar time in the X-ray band, while in the other cases the X-ray light curves appear smooth during the optical rise. We investigate the possible nature of this behavior and conclude th at a multi-component emission is mandatory to explain the optical-to-X-ray afterglow.

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Rising optical afterglows seen by TAROT

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