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The number of long-duration Gamma Ray Burst (LGRB) host galaxies withmeasured metallicities and host masses has now grown to over one hundred,allowing us to investigate how the distributions of both these propertieschange with redshift. Using the combined host galaxy metallicity sample fromGraham & Fruchter (2013) and Kr\"uhler et al. (2015), we find a surprising lackof evolution in the LGRB metallicity distribution across different redshifts.In particular, the fraction of LGRB hosts with relatively high metallicity(12+log(O/H) $\geq$ 8.4) remains essentially constant out to z = 2.5. Thisresult is at odds with the evolution in the mass-metallicity relation oftypical galaxies, which become progressively more metal poor with increasingredshift. A similar result is found when converting the LGRB host galaxy massdistribution taken from the SHOALS (Swift GRB Host Galaxy Legacy Survey) sampleto a corresponding metallicity distribution by applying a redshift-dependentmass-metallicity relation. The SHOALS sample is compiled using an unbiasedselection function implying that the observed lack of evolution in the hostgalaxy high metallicity distribution is not caused by selection effects.However, the LGRB host galaxy metallicities estimated from the stellar mass aretypically a quarter dex higher at all redshifts than the metallicity we measurespectroscopically. This implies that using mass-metallicity relationships toestimate host metallicities will thus produce a substantial systematic bias.

A Surprising Lack of Metallicity Evolution with Redshift in the Long Gamma-Ray Burst Host Galaxy Population