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The observed properties of long gamma-ray burst (GRB) host galaxies show themto often be of a rather low metallicity and/or of high specific star formationrate (SFR). It is not clear which of these properties is a dominant factor indetermining if a galaxy will host a GRB or not. In fact there are indications,at least in the local Universe, that the two may be anticorrelated and that themetallicity is the deciding parameter. Here, we consider GRB production modelsdependent on both quantities and show that when compared to the best availabledata, the respective star formation fractions appear indistinguishable out toredshift of $z\sim 4$. However, the fraction of galaxies hosting a GRB, asdetermined by the specific SFR, is less at tension with the observed hostgalaxy fraction than the corresponding metallicity determined fraction, butthis conclusion is model dependent. Well established galaxy stellar mass andstar formation rate functions at high redshift are crucial in breaking theapparent degeneracy between the specific rate and metallicity in GRB productionprobability.

Gamma-Ray Burst Host Galaxies: Specific Star Formation Rate vs. Metallicity