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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hello all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
We would like to invite all sites to participate in the Center for
Computational Sciences Wednesday seminar series. Here are the details for today’s
seminar:<br>
<br>
Title: “The Early and Late Evolution of Gamma Ray Bursts within the Context
of the Collapsar Model”<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Abstract: We review results from our theoretical studies of
the collapsar model for long duration GRBs. This model was recognized as the
most promising scenario for GRBs prior to the launch of the Swift satellite.
Observations obtained with Switf have improved our understanding of GRBs and
also challenged our models including the collapsar model. In particular, X-ray
flares discovered in a number of GRBs indicate that the GRB central engine may
need to be active for much longer than it was thought before. Using simple
theoretical arguments as well as results from detailed fluid simulations, we
will argue that the collapsar model is still the leading scenario for long
GRBs, although certain important questions remain open. For example, the rapid
growth of the central black hole during the early hyper-accretion phase implies
that the total energy and overall duration of a GRB event can be too small
unless the progenitor rotates relatively fast.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Speaker: Daniel Proga, <st1:place w:st="on"><st1:PlaceType w:st="on">University</st1:PlaceType>
of <st1:PlaceName w:st="on">Las Vegas</st1:PlaceName></st1:place><br>
<br>
Venue: Verlet<br>
<O:P></O:P><br>
Time: 3:30 Eastern<br>
Date: Sep 26, 2007 <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br>
All sites are invited to participate in this seminar. Sites can join us by 2:30
Eastern for Audio-Video check.<br>
<br>
Thanks,<br>
Sandeep Pandanaboyana<br>
Center for Computational Sciences,<br>
<st1:place w:st="on"><st1:PlaceType w:st="on">University</st1:PlaceType> of <st1:PlaceName
w:st="on">Kentucky</st1:PlaceName></st1:place></span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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