{"paper":{"title":"Probing Cosmic Chemical Evolution with Gamma-Ray Bursts: GRB060206 at z=4.048","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. J. Levan, B. L. Jensen, C. C. Th\\\"one, C. Kouveliotou, C. Ledoux, D. H. Hartmann, D. Watson, E. Rol, G. Bj\\\"ornsson, G. Nelemans, J. Gorosabel, J. Hjorth, J. M. Castro Cer\\'on, J. N\\\"ar\\\"anen, J. P. U. Fynbo, J. Sollerman, K. Pedersen, K. Wiersema, M. Limousin, N. R. Tanvir, P. Curran, P. Jakobsson, P. M{\\o}ller, P. M. Vreeswijk, R. A. M. J. Wijers, R. L. C. Starling, R. S. Priddey, S. T. Holland","submitted_at":"2006-02-20T21:04:35Z","abstract_excerpt":"Aim: We present early optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 with the aim of determining the metallicity of the GRB absorber and the physical conditions in the circumburst medium. We also discuss how GRBs may be important complementary probes of cosmic chemical evolution. Method: Absorption line study of the GRB afterglow spectrum. Results: We determine the redshift of the GRB to be z=4.04795+/-0.00020. Based on the measurement of the neutral hydrogen column density from the damped Lyman-alpha line and the metal content from weak, unsaturated Sii lines we deriv"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0602444","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}