{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:OOXTYB3SXEVHJR7ACBHRZYKU5G","short_pith_number":"pith:OOXTYB3S","schema_version":"1.0","canonical_sha256":"73af3c0772b92a74c7e0104f1ce154e99b02cd1e528bf44d5aa6613fe9048c52","source":{"kind":"arxiv","id":"1908.08293","version":1},"attestation_state":"computed","paper":{"title":"A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-ray Transient with a Strong Oxygen Line in NGC 6946","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Chen Wang (XMU), Junfeng Wang (XMU), Roberto Soria (UCAS/NAOC)","submitted_at":"2019-08-22T10:25:17Z","abstract_excerpt":"We discovered and studied an ultraluminous X-ray source (CXOU J203451.1+601043) that appeared in the spiral galaxy NGC 6946 at some point between 2008 February and 2012 May, and has remained at luminosities $\\approx$2-4 $\\times 10^{39}$ erg s$^{-1}$ in all observations since then. Our spectral modelling shows that the source is generally soft, but with spectral variability from epoch to epoch. Using standard empirical categories of the ultraluminous regimes, we find that CXOU J203451.1+601043 was consistent with a broadened disk state in 2012, but was in a transitional state approaching the su"},"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":"1908.08293","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-08-22T10:25:17Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"1a3ef1b9fd62c2e1b91b905d98bd16388584aa436004e9a5a296ac04f81c16bb","abstract_canon_sha256":"1b5c2f3a4847d3331a458dfb86695ec0c2bb8f2a782f15830b9271f09c203617"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:06:54.906775Z","signature_b64":"8+9oNhfYHAM5WYLjNYgM1TO667HrPlM+piTDYsD1xOaBlKOlgk2UCeOVVQC9XLnYLxQeA1OyG5L3tswK7maODw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"73af3c0772b92a74c7e0104f1ce154e99b02cd1e528bf44d5aa6613fe9048c52","last_reissued_at":"2026-07-05T00:06:54.906300Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:06:54.906300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-ray Transient with a Strong Oxygen Line in NGC 6946","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Chen Wang (XMU), Junfeng Wang (XMU), Roberto Soria (UCAS/NAOC)","submitted_at":"2019-08-22T10:25:17Z","abstract_excerpt":"We discovered and studied an ultraluminous X-ray source (CXOU J203451.1+601043) that appeared in the spiral galaxy NGC 6946 at some point between 2008 February and 2012 May, and has remained at luminosities $\\approx$2-4 $\\times 10^{39}$ erg s$^{-1}$ in all observations since then. Our spectral modelling shows that the source is generally soft, but with spectral variability from epoch to epoch. Using standard empirical categories of the ultraluminous regimes, we find that CXOU J203451.1+601043 was consistent with a broadened disk state in 2012, but was in a transitional state approaching the su"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08293","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/1908.08293/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":"1908.08293","created_at":"2026-07-05T00:06:54.906365+00:00"},{"alias_kind":"arxiv_version","alias_value":"1908.08293v1","created_at":"2026-07-05T00:06:54.906365+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08293","created_at":"2026-07-05T00:06:54.906365+00:00"},{"alias_kind":"pith_short_12","alias_value":"OOXTYB3SXEVH","created_at":"2026-07-05T00:06:54.906365+00:00"},{"alias_kind":"pith_short_16","alias_value":"OOXTYB3SXEVHJR7A","created_at":"2026-07-05T00:06:54.906365+00:00"},{"alias_kind":"pith_short_8","alias_value":"OOXTYB3S","created_at":"2026-07-05T00:06:54.906365+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/OOXTYB3SXEVHJR7ACBHRZYKU5G","json":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G.json","graph_json":"https://pith.science/api/pith-number/OOXTYB3SXEVHJR7ACBHRZYKU5G/graph.json","events_json":"https://pith.science/api/pith-number/OOXTYB3SXEVHJR7ACBHRZYKU5G/events.json","paper":"https://pith.science/paper/OOXTYB3S"},"agent_actions":{"view_html":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G","download_json":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G.json","view_paper":"https://pith.science/paper/OOXTYB3S","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1908.08293&json=true","fetch_graph":"https://pith.science/api/pith-number/OOXTYB3SXEVHJR7ACBHRZYKU5G/graph.json","fetch_events":"https://pith.science/api/pith-number/OOXTYB3SXEVHJR7ACBHRZYKU5G/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G/action/storage_attestation","attest_author":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G/action/author_attestation","sign_citation":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G/action/citation_signature","submit_replication":"https://pith.science/pith/OOXTYB3SXEVHJR7ACBHRZYKU5G/action/replication_record"}},"created_at":"2026-07-05T00:06:54.906365+00:00","updated_at":"2026-07-05T00:06:54.906365+00:00"}