{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:RLKKQV5HQEEFYLICL6UJS6TZAW","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":"2b5a08a30ff61398b0a98dc61f550fa1f42e7ae85ae901b8f137c9192a02d411","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-19T16:43:37Z","title_canon_sha256":"7e0f7748a6d76e0a412d209ddcba59ff0f4361f4754b993633e7c1024dc7ca78"},"schema_version":"1.0","source":{"id":"1902.07130","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.07130","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"arxiv_version","alias_value":"1902.07130v1","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.07130","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"pith_short_12","alias_value":"RLKKQV5HQEEF","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"RLKKQV5HQEEFYLIC","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"RLKKQV5H","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:bfa1801255de5730b38f04280ba5b322b25745d47ffe78bd3caac534971161b9","target":"graph","created_at":"2026-05-17T23:49:01Z","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":"The Neutron Star Interior Composition Explorer (NICER) is an X-ray astrophysics payload on the International Space Station. It enables unprecedented high-precision timing of millisecond pulsars without the pulse broadening and delays due to dispersion and scattering within the interstellar medium that plague radio timing. We present initial timing results from a year of data on the millisecond pulsars PSR B1937+21 and PSR J0218+4232, and nine months of data on PSR B1821-24. NICER time-of-arrival uncertainties for the three pulsars are consistent with theoretical lower bounds and simulations ba","authors_text":"A. Harding, A. Lommen, C. B. Markwardt, C. Malacaria, C. Ng, D. J. Nice, D. R. Lorimer, E. C. Ferrara, E. Fonseca, H. Blumer, H. T. Cromartie, I. Cognard, I. H. Stairs, J. A. Ellis, J. Doty, J. K. Swiggum, J. S. Deneva, K. Black, K. C. Gendreau, K. Stovall, K. S. Wood, L. Guillemot, L. Winternitz, M. A. McLaughlin, M. E. DeCesar, M. Kerr, M. L. Jones, M. T. Lam, M. T. Wolff, N. Garver-Daniels, N. Lewandowska, P. A. Gentile, P. B. Demorest, P. R. Brook, P. S. Ray, P. T. Baker, R. D. Ferdman, R. S. Lynch, R. Spiewak, S. Bogdanov, S. Guillot, S. J. Vigeland, S. M. Ransom, S. Price, T. Dolch, T. T. Pennucci, W. W. Zhu, Z. Arzoumanian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-19T16:43:37Z","title":"High-Precision X-ray Timing of Three Millisecond Pulsars with NICER: Stability Estimates and Comparison with Radio"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.07130","kind":"arxiv","version":1},"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:e29ca822b5a026c87abc0d09732a8835be6b4307648491f65040c5d38041a353","target":"record","created_at":"2026-05-17T23:49:01Z","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":"2b5a08a30ff61398b0a98dc61f550fa1f42e7ae85ae901b8f137c9192a02d411","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-19T16:43:37Z","title_canon_sha256":"7e0f7748a6d76e0a412d209ddcba59ff0f4361f4754b993633e7c1024dc7ca78"},"schema_version":"1.0","source":{"id":"1902.07130","kind":"arxiv","version":1}},"canonical_sha256":"8ad4a857a781085c2d025fa8997a7905a0ad12ede3636867956b4dc01f1fb2ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8ad4a857a781085c2d025fa8997a7905a0ad12ede3636867956b4dc01f1fb2ba","first_computed_at":"2026-05-17T23:49:01.881779Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:01.881779Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QxLz6RvRKexKrikxxy31YjYkmGZWGdRdG01AWHJo5QFixhzXP8L8lBeY8wkPaHNAGQaMfF8sgfNoraPDtI+BAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:01.882166Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.07130","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e29ca822b5a026c87abc0d09732a8835be6b4307648491f65040c5d38041a353","sha256:bfa1801255de5730b38f04280ba5b322b25745d47ffe78bd3caac534971161b9"],"state_sha256":"4fd6f64fbdd7ca0f9cbe343633f0aaf91977ec7ba23f0d3b2d92b11faac3b8f1"}