Population III Gamma Ray Bursts

Understand

We discuss a model of Poynting-dominated gamma-ray bursts from the collapse of very massive first generation (pop.

• III) stars.
• From redshifts of order 20, the resulting relativistic jets would radiate in the hard X-ray range around 50 keV and above, followed after roughly a day by an external shock component peaking around a few keV.
• On the same timescales an inverse Compton component around 75 GeV may be expected, as well as a possible infra-red flash.