{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:HTXACFQENICEAVQB5K75DS33DG","short_pith_number":"pith:HTXACFQE","schema_version":"1.0","canonical_sha256":"3cee0116046a04405601eabfd1cb7b199e10ce7a1b9c5aa3e394cccb9fa31553","source":{"kind":"arxiv","id":"1902.00144","version":2},"attestation_state":"computed","paper":{"title":"Neutron Star Interior Composition Explorer X-ray Timing of the Radio and Gamma-ray Quiet Pulsars PSR J1412+7922 AND PSR J1849-0001","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alice K. Harding, Christian Malacaria, Gaurava K. Jaisawal, Keith C. Gendreau, Sebastien Guillot, Slavko Bogdanov, Sridhar S. Manthripragada, Teruaki Enoto, Wynn C. G. Ho, Zaven Arzoumanian","submitted_at":"2019-02-01T01:12:36Z","abstract_excerpt":"We present new timing and spectral analyses of PSR J1412+7922 (Calvera) and PSR J1849-0001, which are only seen as pulsars in X-rays, based on observations conducted with the Neutron Star Interior Composition Explorer (NICER). We obtain updated and substantially improved pulse ephemerides compared to previous X-ray studies, as well as spectra that can be well-fit by simple blackbodies and/or a power law. Our refined timing measurements enable deeper searches for pulsations at other wavelengths and sensitive targeted searches by LIGO/Virgo for continuous gravitational waves from these neutron s"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1902.00144","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-01T01:12:36Z","cross_cats_sorted":[],"title_canon_sha256":"4383583cec51b7fd89e73fdf3d2d7c8a3e8090171d510805b1d4a4172d7241e1","abstract_canon_sha256":"b51c7be316597f0bd9a4e6c4a65f74c4df4d4766071ef0969267e33bba382185"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:44:12.168863Z","signature_b64":"MhklvxRvaOSU6Mf92mGsDOHa58OyUsP5+xVhbfAyns/vsj/8DUsVc5qQIT/3kkXYDyahFO3icB8zkdYOSjG0Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3cee0116046a04405601eabfd1cb7b199e10ce7a1b9c5aa3e394cccb9fa31553","last_reissued_at":"2026-05-17T23:44:12.168230Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:44:12.168230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Neutron Star Interior Composition Explorer X-ray Timing of the Radio and Gamma-ray Quiet Pulsars PSR J1412+7922 AND PSR J1849-0001","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alice K. Harding, Christian Malacaria, Gaurava K. Jaisawal, Keith C. Gendreau, Sebastien Guillot, Slavko Bogdanov, Sridhar S. Manthripragada, Teruaki Enoto, Wynn C. G. Ho, Zaven Arzoumanian","submitted_at":"2019-02-01T01:12:36Z","abstract_excerpt":"We present new timing and spectral analyses of PSR J1412+7922 (Calvera) and PSR J1849-0001, which are only seen as pulsars in X-rays, based on observations conducted with the Neutron Star Interior Composition Explorer (NICER). We obtain updated and substantially improved pulse ephemerides compared to previous X-ray studies, as well as spectra that can be well-fit by simple blackbodies and/or a power law. Our refined timing measurements enable deeper searches for pulsations at other wavelengths and sensitive targeted searches by LIGO/Virgo for continuous gravitational waves from these neutron s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00144","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1902.00144","created_at":"2026-05-17T23:44:12.168333+00:00"},{"alias_kind":"arxiv_version","alias_value":"1902.00144v2","created_at":"2026-05-17T23:44:12.168333+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.00144","created_at":"2026-05-17T23:44:12.168333+00:00"},{"alias_kind":"pith_short_12","alias_value":"HTXACFQENICE","created_at":"2026-05-18T12:33:18.533446+00:00"},{"alias_kind":"pith_short_16","alias_value":"HTXACFQENICEAVQB","created_at":"2026-05-18T12:33:18.533446+00:00"},{"alias_kind":"pith_short_8","alias_value":"HTXACFQE","created_at":"2026-05-18T12:33:18.533446+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG","json":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG.json","graph_json":"https://pith.science/api/pith-number/HTXACFQENICEAVQB5K75DS33DG/graph.json","events_json":"https://pith.science/api/pith-number/HTXACFQENICEAVQB5K75DS33DG/events.json","paper":"https://pith.science/paper/HTXACFQE"},"agent_actions":{"view_html":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG","download_json":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG.json","view_paper":"https://pith.science/paper/HTXACFQE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1902.00144&json=true","fetch_graph":"https://pith.science/api/pith-number/HTXACFQENICEAVQB5K75DS33DG/graph.json","fetch_events":"https://pith.science/api/pith-number/HTXACFQENICEAVQB5K75DS33DG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG/action/storage_attestation","attest_author":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG/action/author_attestation","sign_citation":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG/action/citation_signature","submit_replication":"https://pith.science/pith/HTXACFQENICEAVQB5K75DS33DG/action/replication_record"}},"created_at":"2026-05-17T23:44:12.168333+00:00","updated_at":"2026-05-17T23:44:12.168333+00:00"}