{"paper":{"title":"The Gamma-ray burst 050904 : evidence for a termination shock ?","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2), (2) Universita degli Studi di Roma \"La Sapienza\", (3), (3) INFN - Sezione di Trieste, (4), (4)INFN - Sezione di Roma, (5) CESR, (6), (6) ((1) IASF-Roma/INAF, (6) Observatoire de Haute-Provence, (7) LATT), A. Corsi (1), A. Galli (1), A. Klotz (5), B. Gendre (1), G. Stratta (7), L. Piro (1), M. Boer (6), Y. Damerdji (5)","submitted_at":"2006-03-16T17:42:56Z","abstract_excerpt":"We analyze optical and X-ray observations of GRB 050904 obtained with TAROT and SWIFT. We perform temporal and spectral analysis of the X-ray and optical data. We find significant absorption in the early phase of the X-ray light curve, with some evidence (3 sigma level) of variability. We interpret this as a progressive photo-ionization. We investigate the environment of the burst and constrain its density profile. We find that the overall behavior of the afterglow is compatible with a fireball expanding in a wind environment during the first 2000 seconds after the burst (observer frame). On t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0603431","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"}