Slow and Fast Components in X-Ray light curves of GRBs from BeppoSAX WFC archive

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray

Scientific paper

Gamma Ray Bursts light curves show quite different patterns: from very simple to extremely complex. For some events the time profile in the 2-5 keV energy range is characterised by peaks superposed on a slowly evolving pedestal, which at high energy is less apparent. We describe this behaviour with the presence of two components (slow and fast) having different time scales. The slow component, SC, is usually less pronounced in the 5-10 keV energy range and almost disappears at higher energies. We present a time and spectral study of the SC of several GRBs detected by the WFC on board BeppoSAX. The origin of the SC is likely different from that of the fast component, FC, and can be related either to the presence of a hot photosphere or to the overlapping of the prompt emission with the initial phase of the afterglow.

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