Pop III GRBs: An estimative of the event rate for future surveys

Abstract

We discuss the theoretical event rate of gamma-ray bursts (GRBs) from the collapse of massive primordial stars. We construct a theoretical model to calculate the rate and detectability of these GRBs taking into account all important feedback and recent results from numerical simulations of pristine gas. We expect to observe a maximum of N 0.2 GRBs per year integrated over at z > 6 with Swift and N 10 GRBs per year integrated over at z > 6 with EXIST (assuming a sensitivity up to 10× higher than Swift).