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Galaxies selected through long gamma-ray bursts (GRBs) could be offundamental importance when mapping the star formation history out to thehighest redshifts. Before using them as efficient tools in the early Universe,however, the environmental factors that govern the formation of GRBs need to beunderstood. Metallicity is theoretically thought to be a fundamental driver inGRB explosions and energetics, but is still, even after more than a decade ofextensive studies, not fully understood. This is largely related to twophenomena: a dust-extinction bias, that prevented high-mass and thus likelyhigh-metallicity GRB hosts to be detected in the first place, and a lack ofefficient instrumentation, that limited spectroscopic studies includingmetallicity measurements to the low-redshift end of the GRB host population.The subject of this work is the very energetic GRB 110918A, for which wemeasure one of the largest host-integrated metallicities, ever, and the higheststellar mass for z<1.9. This presents one of the very few robust metallicitymeasurements of GRB hosts at z~1, and establishes that GRB hosts at z~1 canalso be very metal rich. It conclusively rules out a metallicity cut-off in GRBhost galaxies and argues against an anti-correlation between metallicity andenergy release in GRBs.

The low-extinction afterglow in the solar-metallicity host galaxy of GRB 110918A