VLT/X-shooter spectroscopy of the GRB 090926A afterglow

Astronomy and Astrophysics – Astronomy

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Gamma-Ray Sources (Astronomical), Interstellar Matter, Galaxies, Redshift, Gamma-Ray Sources, Gamma-Ray Bursts, Physical Properties, Interacting Galaxies, Galaxy Pairs, And Triples, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analysis of X-shooter optical spectra of its afterglow taken ~22 hr after the trigger. The spectrum shows that the ISM in the GRB host galaxy at z = 2.1071 is rich in absorption features, with two components contributing to the line profiles. In addition to the ground state lines, we detect several excited absorption features. No host galaxy emission lines, molecular absorption features nor diffuse interstellar bands are detected in the spectrum. The line of sight of GRB 090926A presents four weak intervening absorption systems in the redshift range 1.24

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