Shallow decay phase of the early X-ray afterglow from the external shock in wind environment

Details Shallow decay phase of the early X-ray afterglow from the external shock in wind environment Shallow decay phase of the early X-ray afterglow from the external shock in wind environment

2011-09-24

arxiv.org/abs/1109.5218v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages. Submitted to Chinese Physics Letters

Scientific paper

The shallow decay phase of the early X-ray afterglow in gamma-ray bursts discovered by {\it Swift} is a widely discussed topic. As the spectral index does not change at the transferring of the shallow decay phase to a normal phase, it implies this transferring should be a dynamical change rather than a spectral evolution. We suggest both the shallow decay phase and the normal phase are from the external shock in a wind environment, while the transferring time is the deceleration time. We apply this model to GRBs 050319 and 081008, and find them can be well explained by choosing a proper set of parameters.

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