Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922704m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #227.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The frequent presence of x-ray flares in GRB afterglows is one of the surprising discoveries of the Swift mission. We present time-resolved, spectral and temporal analysis of simultaneous XRT and BAT data for a select sample of bright x-ray flares. Our goal is to investigate the nature of the flare emission mechanism. Spectrally, we examine whether a simple powerlaw spectrum is adequate to describe the flare at all times or whether a higher order model such as an exponentially cutoff powerlaw, Band function or thermal model is required. We also examine spectral evolution within individual bright flares and between multiple flares within a single GRB. Temporally, we examine the power density spectra of the flares for evidence of a characteristic slope as has been reported in studies of GRB prompt emission. We discuss our results in the context of whether a common mechanism, namely activity of the GRB central engine, is responsible for both GRB prompt emission and x-ray flares.
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