{"paper":{"title":"The GRB Host Galaxies and Redshifts","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D.A. Frail (2), D. Fox (1), D. Reichart (1), E. Berger (1), F.A. Harrison (1), F. Chaffee (3) ((1) Caltech (2) NRAO/VLA (3) WMKO/CARA), J.S. Bloom (1), P. Price (1), R. Goodrich (3), R. Sari (1), S.G. Djorgovski (1), S.M. Castro (1), S.R. Kulkarni (1), S. Yost (1), T.J. Galama (1)","submitted_at":"2001-07-27T18:19:21Z","abstract_excerpt":"Observations of GRB host galaxies and their environments in general can provide valuable clues about the nature of progenitors. Bursts are associated with faint, <R> ~ 25 mag, galaxies at cosmological redshifts, <z> ~ 1. The host galaxies span a range of luminosities and morphologies, and appear to be broadly typical for the normal, evolving, actively star-forming galaxy populations at comparable redshifts and magnitudes, but may have somewhat elevated SFR per unit luminosity. There are also spectroscopic hints of massive star formation, from the ratios of [Ne III] and [O II] lines. The observ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0107535","kind":"arxiv","version":1},"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"}