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OATS-DAUT SEMINAR
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Speaker: Raffaella Margutti (INAF/Oss. Astr. Brera)

Title: X-ray flare properties in Gamma Ray Bursts: constraining the nature of the central engine
Date: Wednesday, September 29th, 2010
Time: 14:45
Venue: Villa Bazzoni

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Abstract: Gamma-Ray Bursts X-ray flares possibly mark the late time activity of a newly-born hyper-accreting black hole: the GRB central engine. I report on the analysis of the widest sample of X-ray flares to date, highlighting the partial theoretical understanding of the flare emission. I discuss the flare-prompt pulse connection showing a set of observational properties that bridge the gap between the two phenomena, with particular emphasis on the existence of an X-ray flares lag-luminosity relation. Finally, I discuss the theoretical implications on the hyperaccreting process from the average flare luminosity curve.
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contact: Stefano Cristiani (OATS)