Fig. 1
Top: optimistic model for Pop III.2 star formation rate (SFR) assuming a high star formation efficiency and low chemical enrichment. The light points are independent SFR determinations compiled from the literature. Bottom: intrinsic GRB rate dNGRB/dz, i.e., the number of GRBs per year on the sky (on-axis + off-axis) according to Eq. (2). This represents our optimistic model assuming a high star formation efficiency for Pop III.2, slow chemical enrichment, GRB formation efficiency of fGRB = 0.001 and a Salpeter IMF.
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