  Current models suggest gamma-ray bursts could be used as a way of probing
Population III stars - the first stars in the early Universe. In this paper we
use numerical simulations to demonstrate that late time radio observations of
gamma-ray burst afterglows could provide a means of identifying bursts that
originate from Population III stars, if these were highly massive,
independently from their redshift. We then present the results from a pilot
study using the Australia Telescope Compact Array at 17 GHz, designed to test
the hypothesis that there may be Population III gamma-ray bursts amongst the
current sample of known events. We observed three candidates plus a control
gamma-ray burst, and make no detections with upper limits of 20-40 uJy at
500-1300 days post explosion.
