Clues To The Origin Of X-ray Flares In Grb Afterglows With Swift And Fermi

Details Clues To The Origin Of X-ray Flares In Grb Afterglows With Swift And Fermi Clues To The Origin Of X-ray Flares In Grb Afterglows With Swift And Fermi

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1411t&link_type=abstract

American Astronomical Society, HEAD meeting #11, #14.11; Bulletin of the American Astronomical Society, Vol. 41, p.676

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray flares are sudden brightening episodes observed in a large fraction of GRB afterglows, sometimes as early as 100 s since the GRB, sometimes as late as 10^5 s. Several models, most of which require a re-activation of the central engine, have been proposed in the literature to explain their origin. In a range of models the low-energy flare observed by Swift is expected to be accompanied by a high energy counterpart detectable by the Fermi/LAT. The combination of Swift with Fermi offers therefore a unique opportunity to narrow down significantly the range of interpretations and grasp the origin of this puzzling phenomenon.
We have selected a sample of GRBs with bright X-ray flares and simultaneous Swift and Fermi observations and carried out the first systematic search for the predicted high-energy flare in the Fermi/LAT range. We have performed a broadband study of the X-ray flares from UV/optical to GeV energies and derived the spectral and temporal behavior expected by models involving either internal or external shocks of the relativistic jet. Here we show the preliminary results of our multi-wavelength analysis and the comparison with model predictions.

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