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We present rest-frame NIR luminosities and stellar masses for a large anduniformly-selected population of GRB host galaxies using deep Spitzer SpaceTelescope imaging of 119 targets from the Swift GRB Host Galaxy Legacy Surveyspanning 0.03 < z < 6.3, and determine the effects of galaxy evolution andchemical enrichment on the mass distribution of the GRB host population acrosscosmic history. We find strong evolution in the host luminosity distributionbetween z~0.5 (median absolute NIR AB magnitude ~ -18.5, corresponding to M* ~3x10^8 M_sun and z~1.5), but negligible variation between z~1.5 and z~5 (medianmagnitude ~ -21.2, corresponding to M* ~ 5x10^9 M_sun). Dust-obscured GRBsdominate the massive host population but are only rarely seen associated withlow-mass hosts, indicating that massive star-forming galaxies are universallyand (to some extent) homogeneously dusty at high-redshift while low-massstar-forming galaxies retain little dust in their ISM. Comparing our luminositydistributions to field surveys and measurements of the high-z mass-metallicityrelation, our results have good consistency with a model in which the GRB rateper unit star-formation is constant in galaxies with gas-phase metallicitybelow approximately the Solar value but heavily suppressed in more metal-richenvironments. This model also naturally explains the previously-reported"excess" in the GRB rate beyond z>2; metals stifle GRB production in mostgalaxies at z<1.5 but have only minor impact at higher redshifts. Themetallicity threshold we infer is much higher than predicted by single-starmodels and favors a binary progenitor. Our observations also constrain thefraction of cosmic star-formation in low-mass galaxies undetectable to Spitzerto be a small minority at most redshifts (~10% at z~2, ~25% at z~3, and ~50% atz=3.5-6.0).

The Swift GRB Host Galaxy Legacy Survey - II. Rest-Frame NIR Luminosity Distribution and Evidence for a Near-Solar Metallicity Threshold