{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:KWMOLU5EJAMAMLIGUIKYJ62W4J","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"933a5a23a77c38388b79d0f2261b0382c4f2c997dfa027c45f3390479b69894c","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-28T11:01:42Z","title_canon_sha256":"7741af93ce7f795eafe4839f39621c2af6dcc72b92a79c0deadd93ea663efe3c"},"schema_version":"1.0","source":{"id":"1811.11491","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11491","created_at":"2026-05-17T23:56:16Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11491v2","created_at":"2026-05-17T23:56:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11491","created_at":"2026-05-17T23:56:16Z"},{"alias_kind":"pith_short_12","alias_value":"KWMOLU5EJAMA","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_16","alias_value":"KWMOLU5EJAMAMLIG","created_at":"2026-05-18T12:32:33Z"},{"alias_kind":"pith_short_8","alias_value":"KWMOLU5E","created_at":"2026-05-18T12:32:33Z"}],"graph_snapshots":[{"event_id":"sha256:12831ce9c9ec90f672667b0f926dd05ccc3ac7069ff21c07b0322c0dec761e00","target":"graph","created_at":"2026-05-17T23:56:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present observations of the optical afterglow of GRB\\,170817A, made by the {\\it Hubble Space Telescope}, between February and August 2018, up to one year after the neutron star merger, GW170817. The afterglow shows a rapid decline beyond $170$~days, and confirms the jet origin for the observed outflow, in contrast to more slowly declining expectations for `failed-jet' scenarios. We show here that the broadband (radio, optical, X-ray) afterglow is consistent with a structured outflow where an ultra-relativistic jet, with Lorentz factor $\\Gamma\\gtrsim100$, forms a narrow core ($\\sim5^\\circ$) ","authors_text":"A.J. Levan, A.S. Fruchter, B. Gompertz, D. Steeghs, G.P. Lamb, I. Mandel, J.D. Lyman, J. Hjorth, K. Wiersema, N.R. Tanvir, S.R. Oates, T. Kangas","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-28T11:01:42Z","title":"The optical afterglow of GW170817 at one year post-merger"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11491","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c5b75a24ffdc6c4e2e3fb6a4cf629126b2903c526666588e02584fa6265934e7","target":"record","created_at":"2026-05-17T23:56:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"933a5a23a77c38388b79d0f2261b0382c4f2c997dfa027c45f3390479b69894c","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-28T11:01:42Z","title_canon_sha256":"7741af93ce7f795eafe4839f39621c2af6dcc72b92a79c0deadd93ea663efe3c"},"schema_version":"1.0","source":{"id":"1811.11491","kind":"arxiv","version":2}},"canonical_sha256":"5598e5d3a44818062d06a21584fb56e260cf4dcc6d23e1ee65087cd8bb62f2fc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5598e5d3a44818062d06a21584fb56e260cf4dcc6d23e1ee65087cd8bb62f2fc","first_computed_at":"2026-05-17T23:56:16.616801Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:16.616801Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tk5lgzWyXzptDRdiAyzWcbnbQyjFOwlmvqr5/mk6bcNwarjngPXlWNtoSfCLcPdrrvKkeNxVfUXF6Y9MLgYuDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:16.617422Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.11491","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c5b75a24ffdc6c4e2e3fb6a4cf629126b2903c526666588e02584fa6265934e7","sha256:12831ce9c9ec90f672667b0f926dd05ccc3ac7069ff21c07b0322c0dec761e00"],"state_sha256":"1f1a3ff50ed6640be8e420864999eb868f79ff5cca814321b5c44aa2e8f728b4"}