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We present the first reported case of the simultaneous metallicitydetermination of a gamma-ray burst (GRB) host galaxy, from both afterglowabsorption lines as well as strong emission-line diagnostics. Usingspectroscopic and imaging observations of the afterglow and host of thelong-duration Swift GRB121024A at z = 2.30, we give one of the most completeviews of a GRB host/environment to date. We observe a strong damped Ly-alphaabsorber (DLA) with a hydrogen column density of log N(HI) = 21.88 +/- 0.10, H2absorption in the Lyman-Werner bands (molecular fraction of log(f)~ -1.4;fourth solid detection of molecular hydrogen in a GRB-DLA), the nebularemission lines H-alpha, H-beta, [O II], [O III] and [N II], as well as metalabsorption lines. We find a GRB host galaxy that is highly star-forming (SFR ~40 solar masses/yr ), with a dust-corrected metallicity along the line of sightof [Zn/H]corr = -0.6 +/- 0.2 ([O/H] ~ -0.3 from emission lines), and adepletion factor [Zn/Fe] = 0.85 +/- 0.04. The molecular gas is separated by 400km/s (and 1-3 kpc) from the gas that is photoexcited by the GRB. This implies afairly massive host, in agreement with the derived stellar mass oflog(M/M_solar ) = 9.9+/- 0.2. We dissect the host galaxy by characterising itsmolecular component, the excited gas, and the line-emitting star-formingregions. The extinction curve for the line of sight is found to be unusuallyflat (Rv ~15). We discuss the possibility of an anomalous grain sizedistributions. We furthermore discuss the different metallicity determinationsfrom both absorption and emission lines, which gives consistent results for theline of sight to GRB 121024A.

The warm, the excited, and the molecular gas: GRB 121024A shining through its star-forming galaxy