Gendre, B.B.GendreKlotz, A.A.KlotzStratta, GiuliaGiuliaStrattaPreger, B.B.PregerCutini, SaraSaraCutini2020-09-172020-09-172008-11-01https://hdl.handle.net/20.500.13025/1223"SF2A-2008 Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds. C. Charbonnel, F. Combes and R. Samadi. Available online at <A href="http //proc.sf2a.asso.fr">http //proc.sf2a.asso.fr</A>, p.223"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 that a multi-component emission is mandatory to explain the optical-to-X-ray afterglow.http://adsabs.harvard.edu/abs/2008sf2a.conf..223G2008sf2a.conf..223G