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Evidence for diffuse molecular gas and dust in the hearts of gamma-ray burst host galaxies
Context. Damped Lyman- α (DLA) absorption-line systems at the redshifts of gamma-ray burst (GRB) afterglows offer a unique way to probe the physical conditions within star-forming galaxies in the early Universe. Aims. Here we built up a large sample of 22 GRBs at redshifts z > 2 observed with VLT/X-shooter …