{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:OXQUKJ4CT7YG5XRED5TJTYPV5G","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":"b82161f3be7177c60bf6b5cdc23b9e5183b32d9c8c6abd36d1aa3fbf0d1eb221","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-05-12T15:47:50Z","title_canon_sha256":"fff1ea19e3b11c9ec0458c3dc6faa42c3e0763317e5bf274a3393d8fdd72540d"},"schema_version":"1.0","source":{"id":"astro-ph/0505260","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0505260","created_at":"2026-07-04T16:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0505260v1","created_at":"2026-07-04T16:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0505260","created_at":"2026-07-04T16:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"OXQUKJ4CT7YG","created_at":"2026-07-04T16:52:22Z"},{"alias_kind":"pith_short_16","alias_value":"OXQUKJ4CT7YG5XRE","created_at":"2026-07-04T16:52:22Z"},{"alias_kind":"pith_short_8","alias_value":"OXQUKJ4C","created_at":"2026-07-04T16:52:22Z"}],"graph_snapshots":[{"event_id":"sha256:c70746734be21ba8b39ac1de485e3476ffa613819d6c9c5399880789c1bdc7e9","target":"graph","created_at":"2026-07-04T16:52:22Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0505260/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ultraluminous X-ray sources (ULXs) have been described variously as the most luminous normal X-ray binaries, as hypernovae, and as \"intermediate-mass\" black holes with masses of hundreds to thousands of solar masses. We present results on M74 X-1 (CXOU J013651.1+154547), a ULX in the nearby spiral galaxy M74 (NGC 628), from observations by Chandra and XMM-Newton. M74 X-1is a persistent source which exhibits extreme variability and changes in spectral state on timescales of several thousand seconds. Its variability timescales and behavior resemble some Galactic microquasars. This suggests that ","authors_text":"2), (2) University of Leicester, 3), (3) MIT Kavli Institute for Astrophysics, A.H. Prestwich (1) ((1) Harvard-Smithsonian Center for Astrophysics, M.I. Krauss (1, M.R. Garcia (1), R.E. Kilgard (1, Space Research), T.P. Roberts (2)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-05-12T15:47:50Z","title":"M74 X-1 (CXOU J013651.1+154547): An Extremely Variable Ultraluminous X-Ray Source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0505260","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:e7437236123b776b7ab9b7969b661a0ffd8299e28294e9d9efb99b8d79c27a94","target":"record","created_at":"2026-07-04T16:52:22Z","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":"b82161f3be7177c60bf6b5cdc23b9e5183b32d9c8c6abd36d1aa3fbf0d1eb221","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-05-12T15:47:50Z","title_canon_sha256":"fff1ea19e3b11c9ec0458c3dc6faa42c3e0763317e5bf274a3393d8fdd72540d"},"schema_version":"1.0","source":{"id":"astro-ph/0505260","kind":"arxiv","version":1}},"canonical_sha256":"75e14527829ff06ede241f6699e1f5e98ccafe14cf3580180b7a02f3769bd652","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75e14527829ff06ede241f6699e1f5e98ccafe14cf3580180b7a02f3769bd652","first_computed_at":"2026-07-04T16:52:22.280069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:52:22.280069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RoBrU3MuXTm61btHOr/sOWcC/sHGkECqx72OzVmIoNqWPZRtKlIMGyfZE+CWngQFMpCJIyg6iU7zLGPWnzISDg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:52:22.280485Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0505260","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e7437236123b776b7ab9b7969b661a0ffd8299e28294e9d9efb99b8d79c27a94","sha256:c70746734be21ba8b39ac1de485e3476ffa613819d6c9c5399880789c1bdc7e9"],"state_sha256":"65149616679bc6d9786e66a44a283816f94033b8aa63e04ce0e104edb09c2955"}