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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130625T123000
DTEND;TZID=Atlantic/Canary:20130625T133000
UID:iactalks-509
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/509
CREATED:2013-06-25T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: Gamma-ray bursts and their X-ray and optical afterglow
DESCRIPTION: Gamma-ray bursts and their X-ray and optical afterglow\nDr. El
 ena Zaninoni\n\nGamma-Ray Bursts (GRBs) are the most powerful sources of e
 lectromagnetic  radiation in the Universe. There are many open questions a
 bout their  origin and their nature, and the answers should be searched in
  the large  amount of data collected during these last years. We focused o
 n the  study of the their X-ray and optical afterglow properties, as obser
 ved  by the Swift X-Ray Telescope (XRT) and ground-based optical telescope
 s.  We investigated the observer and rest-frame properties of all GRBs  ob
 served by Swift between December 2004 and December 2010 with  spectroscopi
 c redshift through a comprehensive statistical analysis of  the XRT light-
 curves of GRBs carried out in a model-independent way. We  found out a thr
 ee parameter correlation that is followed both by short  and long GRBs. We
  also carried out a systematic analysis of the optical  data available in 
 literature for the same GRBs to investigate the GRB  emission mechanisms a
 nd to study their environment properties. Our  analysis shows that the gas
 -to-dust ratios of GRBs are larger than the  values calculated for the Mil
 ky Way, the Large Magellanic Cloud, and the  Small Magellanic Cloud. In th
 is talk I will show the major results of  the analysis of this large set o
 f data.
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