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The radio-emitting CSM requires high mass-loading rates, M_dot ~10^{-4}--10^{-3} M_sun yr^{-1}, but modest total CSM masses, M_CSM ~10^{-4}--10^{-2} M_sun."},{"attestation":"unclaimed","claim_id":"C2","kind":"weakest_assumption","source":"verdict.weakest_assumption","status":"machine_extracted","text":"The circumstellar material follows a broken power-law density profile whose break radius and indices are chosen to match the observed radio light-curve shapes, with radio emission arising solely from forward-shock synchrotron radiation subject only to synchrotron self-absorption and external free-free absorption (abstract, paragraphs describing the model framework)."},{"attestation":"unclaimed","claim_id":"C3","kind":"one_line_summary","source":"verdict.one_line_summary","status":"machine_extracted","text":"A synchrotron forward-shock model with confined broken-power-law CSM explains FBOT radio diversity via shock transition out of the dense shell, yielding trans-relativistic velocities of 0.1-0.5c and high but brief mass-loss rates of 10^{-4} to 10^{-3} solar masses per year."},{"attestation":"unclaimed","claim_id":"C4","kind":"headline","source":"verdict.pith_extraction.headline","status":"machine_extracted","text":"Trans-relativistic shocks crossing a confined circumstellar shell explain the radio diversity of fast blue optical transients."}],"snapshot_sha256":"6f7b6dfdf079f0c3b226cd1d143b8b3b9c396572179affefe9b8a90aa0a1f33e"},"formal_canon":{"evidence_count":2,"snapshot_sha256":"fb23d1d8638b67ff4a9ad4687d6c917956c8ff682c6c2d58c62e9668da13440d"},"integrity":{"available":true,"clean":true,"detectors_run":[{"findings_count":0,"name":"doi_title_agreement","ran_at":"2026-05-19T23:31:20.188011Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"doi_compliance","ran_at":"2026-05-19T23:31:00.754123Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"claim_evidence","ran_at":"2026-05-19T22:01:57.827385Z","status":"completed","version":"1.0.0"},{"findings_count":0,"name":"ai_meta_artifact","ran_at":"2026-05-19T21:33:23.772552Z","status":"skipped","version":"1.0.0"}],"endpoint":"/pith/2605.17280/integrity.json","findings":[],"snapshot_sha256":"06787ee8929900405803c1f81dd78151a025bb968e18896d2cb00b7e32a9b78f","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Fast blue optical transients (FBOTs) are luminous, rapidly evolving explosions whose radio emission provides a sensitive probe of shock interaction and the circumstellar material (CSM) surrounding the progenitor. 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