The Swift Xrt:. Early X-Ray Afterglow

Details The Swift Xrt:. Early X-Ray Afterglow The Swift Xrt:. Early X-Ray Afterglow

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.2025t&link_type=abstract

"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an

Physics

Scientific paper

Thanks to the X-ray Telescope (XRT) on board the Swift satellite, we have now the X-ray light curves of hundreds of bursts on time scales from ~ 1 minute up to weeks and in some cases months from the burst explosion. This database allow us to investigate the physics of the highly relativistic fireball outflow and its interaction with the circumburst environment. Unexpectedly, these X-ray light curves in the early phases are characterised by different slopes, with a very steep decay in the first few hundred of seconds, followed by a flatter decay and, a few thousand of seconds later, by a somewhat steeper decay. Often strong flare activity up to few hours after the burst explosion is also seen. One possible interpretation is that the central engine activity last much longer than expected, still dominating the X-ray light curve well after the prompt phase, up to a few thousand of seconds. The flatter phase is probably the combination of late-prompt emission and afterglow emission. When the late-prompt emission ends the light curve steepens again. Also the late evolution of the XRT light curves is puzzling, in particular many of them do not show a "jet-break". Although there are various possibilities to explain these observations, a clear understanding of the formation and evolution of the jet and of the afterglow emission is still lacking.

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