X-ray Flares from Swift GRBs

Details X-ray Flares from Swift GRBs X-ray Flares from Swift GRBs

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1605f&link_type=abstract

American Astronomical Society, HEAD meeting #9, #16.05; Bulletin of the American Astronomical Society, Vol. 38, p.379

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Scientific paper

Observations of gamma ray bursts (GRBs) with Swift produced the initially surprising result that many bursts have large X-ray flares superimposed on the underlying afterglow. The flares were sometimes intense, rapid, and late relative to the nominal prompt phase. One flare was observed by XRT with a flux > 500x the afterglow. This burst then surprised observers by flaring again after > 500 sec. Short, intense, repetitive, and late flaring can be most easily understood within the context of the standard fireball model, if the internal engine that powers the prompt GRB emission is still active at late times. The origin of the flares can be investigated by comparing the spectra during the flares to that of the afterglow and the initial prompt emission. In this work, we have analyzed all significant X-ray flares from the first 110 GRBs observed by Swift. In addition to temporal analysis, a variety of spectral models have been fit to each flare. A portion of the X-ray flares provided enough emission to allow the various spectral models to be parameterized and compared with one another. In some cases, the spectral fits favor a spectral model more akin to the prompt emission than to that of an afterglow. The overall flare properties will be presented, particularly for the dramatic flares, and the implications of the entire flare sample will be discussed.

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