{"paper":{"title":"Relativistic ejecta from XRF 060218 and the rate of cosmic explosions","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Gal-Yam, A. M. Soderberg, A. Rau, B. E. Penprase, B. P. Schmidt, D. A. Frail, D. B. Fox, D. N. Burrows, D.-S. Moon, E. Berger, E. Nakar, E. Ofek, G. Pooley, J. A. Nousek, M. Kasliwal, N. Gehrels, P. A. Price, P. B. Cameron, P. J. McCarthy, R. A. Chevalier, R. Sari, S. B. Cenko, S. E. Perrson, S. R. Kulkarni, T. Piran","submitted_at":"2006-04-18T22:51:47Z","abstract_excerpt":"Over the last decade, long-duration gamma-ray bursts (GRBs) including the subclass of X-ray flashes (XRFs) have been revealed to be a rare variety of Type Ibc supernova (SN). While all these events result from the death of massive stars, the electromagnetic luminosities of GRBs and XRFs exceed those of ordinary Type Ibc SNe by many orders of magnitude. The essential physical process that causes a dying star to produce a GRB or XRF, and not just an SN, remains the crucial open question. Here we present radio and X-ray observations of XRF 060218 (associated with SN 2006aj), the second nearest GR"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0604389","kind":"arxiv","version":3},"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"}