Speaker
Asaf Pe'er
(Bar Ilan University)
Description
In this talk, I will present two recent models for explaining the observed GRB spectra.
As a GRB jet drills its way through the collapsing star, it traps a baryonic "cork" ahead of it. If the jet does not cross this cork, but rather photons that are emitted deep in the flow (e.g., by pair annihilation) are scattered by the cork, an observer close to the jet axis will see these photons due to light abberation. I will show that this model has several advantages, such s its ability to naturally explain both the high and low energy spectral slopes, the observed temporal peak evolution, the delay of the soft photons and the E_pk-Eiso ("Amati") relation, among others.
