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> Title: Mechanical model and GRB afterglows 
> Speaker: Dr. Z. Lucas Uhm (KASI) 
> Date & Time: August 28, (Fri) 3 PM, 2009 
> Place: International Education Building #1001 
> Abstract: Afterglow emission of gamma-ray bursts (GRBs) are believed to be the synchrotron radiation from the relativistic blast waves. The standard picture of afterglow production by the forward shock wave is difficult to reconcile with recent multi-wavelength observations; unexpected features such as the plateau in X-ray light curve, followed by a peculiar chromatic break. This calls for revisiting the basic picture of GRB explosion. Theoretically, a long-lived reverse shock expected in the burst ejecta needs to be consistently described together with the forward shock even for a very general class of explosions. In this lecture, the blast-wave problem is formulated and the jump conditions are derived for the forward and reverse shocks of the blast wave. Then the mechanical model that we developed to describe relativistic blast waves is presented, which meets the requirement above. It is also described how the synchrotron radiation is calculated for the blast wave while including the effect of spherical curvature.
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