Swift X-ray Afterglows: Where are the X-ray Jet Breaks?

Details Swift X-ray Afterglows: Where are the X-ray Jet Breaks? Swift X-ray Afterglows: Where are the X-ray Jet Breaks?

2007-02-23

arxiv.org/abs/astro-ph/0702633v1

Nuovo Cim.B121:1273-1287,2006

Astronomy and Astrophysics

Astrophysics

13 pages; 15 figures; Proceeding of the "Swift and GRBs: Unveiling the Relativistic Universe" meeting,Venice, June 5-9,2006, t

Scientific paper

10.1393/ncb/i2007-10252-7

We examine the Swift/X-ray Telescope (XRT) light curves from the first ~150 gamma-ray burst (GRB) afterglows. Although we expected to find jet breaks at typical times of 1-2 days after the GRB, we find that these appear to be extremely rare. Typical light curves have a break in the slope at about 10^4s, followed by a single power-law decay whose slope is much too shallow to be consistent with expectations for jet breaks. X-ray light curves typically extend out to ~10 days without any further breaks, until they become too faint for the XRT to detect. In some extreme cases, light curves extend out to more than two months without evidence for jet breaks. This raises concerns about our understanding of afterglow and jet dynamics, and of GRB energetics.

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