Swift XRT Observations of X-ray Flares in GRB Afterglows

Details Swift XRT Observations of X-ray Flares in GRB Afterglows Swift XRT Observations of X-ray Flares in GRB Afterglows

2005-11-01

arxiv.org/abs/astro-ph/0511039v2

Astronomy and Astrophysics

Astrophysics

7 pages, 12 figures, X-Ray Universe 2005 conference proceedings

Scientific paper

The Swift XRT has been observing GRB afterglows since December 23, 2004. Three-quarters of these observations begin within 300 s of the burst onset, providing an unprecendented look at the behavior of X-ray emission from GRB afterglows in the first few hours after the burst. While most of the early afterglows have smoothly declining lightcurves, a substantial fraction has large X-ray flares on short time-scales. We suggest that these flares provide support for models with extended central engine activity producing late-time internal shocks.

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