Late evolution of the X-ray afterglow of GRB 030329

Details Late evolution of the X-ray afterglow of GRB 030329 Late evolution of the X-ray afterglow of GRB 030329

2004-02-26

arxiv.org/abs/astro-ph/0402644v2

Astron.Astrophys. 423 (2004) 861-865

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for publication in A&A, revised discussion and one table added

Scientific paper

10.1051/0004-6361:20041027

The X-ray afterglow of the Gamma-Ray Burst GRB 030329, associated to SN2003dh at z=0.1685, has been observed with XMM-Newton 258 days after the burst explosion. A source with flux of (6.2 +/- 2.3) 10^{-16} erg cm^{-2} s^{-1} (0.5-2 keV) has been detected at the GRB position. This measurement, together with a re-analysis of the previous X-ray observations, indicates a flattening of the X-ray light curve ~40 days after the burst. This is in remarkable agreement with the scenario invoking the presence of two jets with different opening angles. The wider jet should be responsible for the observed flattening due to its transition into the non-relativistic Sedov-Taylor phase.

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