XRT Light curves: Morphology, Flares and Energy
  Following a brief introduction we show that the observations obtained so far with the Swift satellite begin to shed light over a variety of problems that were left open following the excellent performance and related discoveries of the Italian - Dutch Beppo SAX satellite. The XRT light curves show common characteristics that are reasonably understood within the framework of the fireball model. Unforeseen flares are however detected in a large fraction of the GRB observed and the energy emitted by the brightest ones may be as much as 85% of the total soft X ray emission measured by XRT. These characteristics seems to be common to long and short bursts. 
G. Chincarini, V. Mangano, A. Moretti, M. Perri, P. Romano, S.   Campana, S. Covino, G. Tagliaferri, L. Angelini, D. Burrows...