Can The Theoretical Models Of Gamma Ray Bursts Predict The Observed Correlations Between Their Properties ?

 TYPE Astrophysics Seminar Speaker: Arnon Dar Affiliation: Technion Date: 09.05.2012 Time: 14:30 Location: Lidow 620
 Abstract: Recently, several new correlations between the observed $\gamma$-ray andX-ray properties of gamma-ray bursts (GRBs) were  discovered from acomprehensive analysis of the X-ray light curves of more than 650 GRBsmeasured with the Swift X-ray telescope (Swift/XRT) during the years2004-2010.  Like previously well established correlations, they challengeGRB models. Here we show that in the cannonball (CB) model of GRBs, thenewly discovered correlations and those that follow from them, have thesame simple kinematic origin as those discovered earlier. They result fromthe strong dependence of the observed radiations on the bulk motionLorentz and Doppler factors of the jet of highly relativistic plasmoids(CBs) that produces these radiations by interaction with the mediumthrough which it propagates.