Flares in gamma ray bursts

We illustrate some of the preliminary results obtained with a new sample of flares and a new analysis. In this paper we deal mainly with the analysis related to the flare energy and describe the work in progress to measure the average flare luminosity Curve. We discuss in brief GRB050904 and GRB050724 for matters relevant to this work. In particular we measure the contribution given to the flares by GRB050904 and give a new interpretation for the decaying early XRT light Curve of GRB050724. We briefly illustrate, for GRB050724, the first evidence that the early decay is given by the subsequent emission of events with Width/T(Peak) < 1 and the total energy of these events is larger than the energy emitted during the prompt emission spike showing, indeed, that not only the central engine may still be active after hundreds of seconds of the first spike but that this may still be part of' the prompt emission. (C) 2009 COSPAR. Published by Elsevier Ltd. All rights reserved.