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Article overview
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The flat decay phase in the early X-ray afterglows of Swift GRBs | Jonathan Granot
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18 Dec 2006 | Abstract: | 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. | Source: | arXiv, astro-ph/0612516 | Services: | Forum | Review | PDF | Favorites |
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