VLT/X-shooter spectroscopy of the GRB 090926A afterglow
- V. D’Elia
- J. P. U. Fynbo
- S. Covino
- P. Goldoni
- P. Jakobsson
- F. Matteucci
- S. Piranomonte
- J. Sollerman
- C. C. Thöne
- S. D. Vergani
- P. M. Vreeswijk
- D. J. Watson
- K. Wiersema
- T. Zafar
- A. de Ugarte Postigo
- H. Flores
- J. Hjorth
- L. Kaper
- A. J. Levan
- D. Malesani
- B. Milvang-Jensen
- E. Pian
- G. Tagliaferri
- N. R. Tanvir
DOIAbstract
Aims. The aim of this paper is to study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analyzing optical spectra of its afterglow. Methods. We analyzed medium-resolution spectroscopic observations (R = 10000, corresponding to 30 km s-1, S/N = 15−30 and wavelength range 3000−25000) of the optical afterglow of GRB 090926A, taken with X-shooter at the VLT ~ 22 h after the GRB trigger. Results. 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 ...
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