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The X-shooter GRB afterglow legacy sample (XS-GRB)
Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr DAWN, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Tech Univ Denmark, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark..
Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr DAWN, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Tech Univ Denmark, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark.;Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark..
Univ Paris Diderot, APC Astroparticule & Cosmol, CNRS IN2P3, CEA Irfu,Observ Paris,Sorbonne Paris Cite, 10 Rue Alice Domon & LConie Duquet, F-75205 Paris 13, France.;Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France..
Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr DAWN, Juliane Marius Vej 30, DK-2100 Copenhagen O, Denmark.;Tech Univ Denmark, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark..
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2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 623, article id A92Article in journal (Refereed) Published
Abstract [en]

In this work we present spectra of all gamma-ray burst (GRB) afterglows that have been promptly observed with the X-shooter spectrograph until 31/03/2017. In total, we have obtained spectroscopic observations of 103 individual GRBs observed within 48 hours of the GRB trigger. Redshifts have been measured for 97 per cent of these, covering a redshift range from 0.059 to 7.84. Based on a set of observational selection criteria that minimise biases with regards to intrinsic properties of the GRBs, the follow-up effort has been focused on producing a homogeneously selected sample of 93 afterglow spectra for GRBs discovered by the Swift satellite. We here provide a public release of all the reduced spectra, including continuum estimates and telluric absorption corrections. For completeness, we also provide reductions for the 18 late-time observations of the underlying host galaxies. We provide an assessment of the degree of completeness with respect to the parent GRB population, in terms of the X-ray properties of the bursts in the sample and find that the sample presented here is representative of the full Swift sample. We have constrained the fraction of dark bursts to be <28 per cent and confirm previous results that higher optical darkness is correlated with increased X-ray absorption. For the 42 bursts for which it is possible, we have provided a measurement of the neutral hydrogen column density, increasing the total number of published HI column density measurements by similar to 33 per cent. This dataset provides a unique resource to study the ISM across cosmic time, from the local progenitor surroundings to the intervening Universe.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2019. Vol. 623, article id A92
Keywords [en]
gamma-ray burst: general, galaxies: high-redshift, ISM: general, techniques: spectroscopic, catalogs, galaxies: star formation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-251297DOI: 10.1051/0004-6361/201832835ISI: 000460890300002Scopus ID: 2-s2.0-85062818658OAI: oai:DiVA.org:kth-251297DiVA, id: diva2:1314662
Note

QC 20190509

Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-09Bibliographically approved

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