Rising optical afterglows seen by TAROT

Authors :: Gendre, B.
Klotz, A.
Stratta, G.
Preger, B.
Piro, L.
Pelangeon, A.
Galli, A.
Cutini, S.
Corsi, A.
Boer, M.
Atteia, J. L.
Publication Year :: 2008
Abstract: 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.<br />Comment: 2 pages, proceeding of a poster presented at the journees de la SF2A

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