Jet Breaks in Short Gamma-Ray Bursts. II. The Collimated Afterglow of GRB 051221A

@article{Burrows2006JetBI,
  title={Jet Breaks in Short Gamma-Ray Bursts. II. The Collimated Afterglow of GRB 051221A},
  author={David N. Burrows and Dirk Grupe and M. Capalbi and A. Panaitescu and Sandeep K. Patel and Chryssa Kouveliotou and Bing Zhang and P. M{\'e}sz{\'a}ros and Guido L. Chincarini and N. C. Gehrels and Ralph Wijers},
  journal={The Astrophysical Journal},
  year={2006},
  volume={653},
  pages={468 - 473}
}
We report the best evidence to date of a jet break in a short gamma-ray burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221A. The combined X-ray light curve, which has three breaks, is similar to those commonly observed in Swift observations of long GRBs. A flat segment of the light curve at ~0.1 days after the burst represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. The last break in the… 

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