The flat decay phase in the early X-ray afterglows of Swift GRBs

Details The flat decay phase in the early X-ray afterglows of Swift GRBs The flat decay phase in the early X-ray afterglows of Swift GRBs

2006-12-18

arxiv.org/abs/astro-ph/0612516v1

Nuovo Cim.B121:1073-1079,2006

Astronomy and Astrophysics

Astrophysics

To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9,

Scientific paper

10.1393/ncb/i2007-10063-x

Many Swift GRBs show an early phase of shallow decay in their X-ray afterglows, lasting from $t \sim 10^{2.5} $s to $\sim 10^4 $s after the GRB, where the flux decays as $\sim t^{-0.2}-t^{-0.8}$. This is perhaps the most mysterious of the new features discovered by Swift in the early X-ray afterglow, since it is still not clear what causes it. I discuss different possible explanations for this surprising new discovery, as well as their potential implications for the gamma-ray efficiency, the afterglow kinetic energy, and perhaps even for the physics of collisionless relativistic shocks.

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