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

TL;DR

This paper estimates the rate of gamma-ray bursts from the collapse of primordial massive stars, predicting low detection rates for future surveys like Swift and EXIST at high redshifts.

Contribution

It presents a new theoretical model to estimate the event rate and detectability of Pop III GRBs considering feedback effects and recent simulation results.

Findings

Maximum of ~0.2 GRBs per year with Swift at z > 6

Up to 10 GRBs per year with EXIST at z > 6

Provides insights into the detectability of primordial GRBs

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 $\lesssim$ 0.2 GRBs per year integrated over at z > 6 with \textit{Swift} and N $\lesssim$ 10 GRBs per year integrated over at z > 6 with EXIST.