{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:LS5PJZNJPUPN4CTDJPL73HQHMD","short_pith_number":"pith:LS5PJZNJ","schema_version":"1.0","canonical_sha256":"5cbaf4e5a97d1ede0a634bd7fd9e0760ce8f2f5c7e7dd862d00d6b2053b02ba4","source":{"kind":"arxiv","id":"2307.06988","version":1},"attestation_state":"computed","paper":{"title":"An Extreme Black Hole in the Recurrent X-ray Transient XTE J2012+381","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Abderahmen Zoghbi, Andrew C. Fabian, John A. Tomsick, Jon M. Miller, McKinley C. Brumback, Paul A. Draghis","submitted_at":"2023-07-13T18:00:00Z","abstract_excerpt":"The black hole candidate XTE J2012+381 underwent an outburst at the end of 2022. We analyzed 105 NICER observations and 2 NuSTAR observations of the source during the outburst. The NuSTAR observations of the $M \\sim10M_\\odot$ black hole indicate clear signs of relativistic disk reflection, which we modeled to measure a BH spin of $a=0.988^{+0.008}_{-0.030}$ and an inclination of $\\theta=68^{+6}_{-11}$ degrees ($1\\sigma$ statistical errors). In our analysis, we test an array of models and examine the effect of fitting NuSTAR spectra alone versus fitting simultaneously with NICER. We find that w"},"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":"2307.06988","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-13T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"36430ccddd6af3e228000274b6fed54bdc63c0c69c4d1975bbd26fde83e40c37","abstract_canon_sha256":"8bd372a206c28b03b697197289465b320743fed331c5e358f68188f8db02024f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:30:48.748193Z","signature_b64":"qDnJI7w8IPRC1te1chv9Z1ty4y482AcOf8FWSvotaGVkN3A5V9aOsVVJPauh8EtaS5xMFNw3DNcytMDVDbcMAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5cbaf4e5a97d1ede0a634bd7fd9e0760ce8f2f5c7e7dd862d00d6b2053b02ba4","last_reissued_at":"2026-07-05T06:30:48.747621Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:30:48.747621Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An Extreme Black Hole in the Recurrent X-ray Transient XTE J2012+381","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Abderahmen Zoghbi, Andrew C. Fabian, John A. Tomsick, Jon M. Miller, McKinley C. Brumback, Paul A. Draghis","submitted_at":"2023-07-13T18:00:00Z","abstract_excerpt":"The black hole candidate XTE J2012+381 underwent an outburst at the end of 2022. We analyzed 105 NICER observations and 2 NuSTAR observations of the source during the outburst. The NuSTAR observations of the $M \\sim10M_\\odot$ black hole indicate clear signs of relativistic disk reflection, which we modeled to measure a BH spin of $a=0.988^{+0.008}_{-0.030}$ and an inclination of $\\theta=68^{+6}_{-11}$ degrees ($1\\sigma$ statistical errors). In our analysis, we test an array of models and examine the effect of fitting NuSTAR spectra alone versus fitting simultaneously with NICER. We find that w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.06988","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2307.06988/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2307.06988","created_at":"2026-07-05T06:30:48.747700+00:00"},{"alias_kind":"arxiv_version","alias_value":"2307.06988v1","created_at":"2026-07-05T06:30:48.747700+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.06988","created_at":"2026-07-05T06:30:48.747700+00:00"},{"alias_kind":"pith_short_12","alias_value":"LS5PJZNJPUPN","created_at":"2026-07-05T06:30:48.747700+00:00"},{"alias_kind":"pith_short_16","alias_value":"LS5PJZNJPUPN4CTD","created_at":"2026-07-05T06:30:48.747700+00:00"},{"alias_kind":"pith_short_8","alias_value":"LS5PJZNJ","created_at":"2026-07-05T06:30:48.747700+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/LS5PJZNJPUPN4CTDJPL73HQHMD","json":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD.json","graph_json":"https://pith.science/api/pith-number/LS5PJZNJPUPN4CTDJPL73HQHMD/graph.json","events_json":"https://pith.science/api/pith-number/LS5PJZNJPUPN4CTDJPL73HQHMD/events.json","paper":"https://pith.science/paper/LS5PJZNJ"},"agent_actions":{"view_html":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD","download_json":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD.json","view_paper":"https://pith.science/paper/LS5PJZNJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2307.06988&json=true","fetch_graph":"https://pith.science/api/pith-number/LS5PJZNJPUPN4CTDJPL73HQHMD/graph.json","fetch_events":"https://pith.science/api/pith-number/LS5PJZNJPUPN4CTDJPL73HQHMD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD/action/storage_attestation","attest_author":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD/action/author_attestation","sign_citation":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD/action/citation_signature","submit_replication":"https://pith.science/pith/LS5PJZNJPUPN4CTDJPL73HQHMD/action/replication_record"}},"created_at":"2026-07-05T06:30:48.747700+00:00","updated_at":"2026-07-05T06:30:48.747700+00:00"}