GRB 050904 as seen by SWIFT and TAROT

Details GRB 050904 as seen by SWIFT and TAROT GRB 050904 as seen by SWIFT and TAROT

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..137g&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present optical and X-ray observations of GRB 050904 obtained with TAROT and Swift. We performed temporal and spectral analysis of the XRT data and found evidence for a variable absorption. The early X-ray flare and the following afterglow spectral properties are similar. In the optical band, we observe a flare simultaneous with the X-ray one. In the framework of the external shock scenario, we consider different models to explain the simultaneity of the X-ray and optical flares and the late afterglow emission. Considering both the spectral and temporal information we compare the model predictions with the observed data. The overall behaviour of the early afterglow is compatible with a fireball expanding in a wind environment. Finally, the late optical flattening might be explained by the effect of a termination shock.

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