{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:7Y52OC6EOLQUQUOSP3LG7ALDAG","short_pith_number":"pith:7Y52OC6E","canonical_record":{"source":{"id":"astro-ph/9810050","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-10-03T13:45:00Z","cross_cats_sorted":[],"title_canon_sha256":"3e24a06e3c8e581d0b821e8209d2067047a9bbb626a4aacf4b55f1bf26780382","abstract_canon_sha256":"b345bacfacf5fcb454753421a9d8af004fe627deba52648247e63551dbb766da"},"schema_version":"1.0"},"canonical_sha256":"fe3ba70bc472e14851d27ed66f816301a99dea4b5c52b07575e8fdb09c2add92","source":{"kind":"arxiv","id":"astro-ph/9810050","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9810050","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9810050v1","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9810050","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_12","alias_value":"7Y52OC6EOLQU","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_16","alias_value":"7Y52OC6EOLQUQUOS","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_8","alias_value":"7Y52OC6E","created_at":"2026-07-04T16:07:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:7Y52OC6EOLQUQUOSP3LG7ALDAG","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9810050","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-10-03T13:45:00Z","cross_cats_sorted":[],"title_canon_sha256":"3e24a06e3c8e581d0b821e8209d2067047a9bbb626a4aacf4b55f1bf26780382","abstract_canon_sha256":"b345bacfacf5fcb454753421a9d8af004fe627deba52648247e63551dbb766da"},"schema_version":"1.0"},"canonical_sha256":"fe3ba70bc472e14851d27ed66f816301a99dea4b5c52b07575e8fdb09c2add92","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:07:04.856772Z","signature_b64":"4SAyaBja97M5rmSTukca4FTr5VB0w2MvwXYYTT2zLXlP5+v6IYjK8XzQmmej9rVpeGq+JyFZ/+1l3xebwkljAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fe3ba70bc472e14851d27ed66f816301a99dea4b5c52b07575e8fdb09c2add92","last_reissued_at":"2026-07-04T16:07:04.856420Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:07:04.856420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9810050","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:07:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oX8otwWfxaaMmeHymDx81GVxsXqwPLGCG1eUr7kzmoNMdsuGHr4/VDWAz3vXPQuQa6KLUxZxToVNSRbF2ynqBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T04:39:31.938428Z"},"content_sha256":"109798c01a0021b430724dd75e638c94420985de3293e082d21a50c1c50ec070","schema_version":"1.0","event_id":"sha256:109798c01a0021b430724dd75e638c94420985de3293e082d21a50c1c50ec070"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:7Y52OC6EOLQUQUOSP3LG7ALDAG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The eclipsing X-ray pulsar X-7 in M33","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"E. Kuulkers, G. Dubus, K.S. Long, P.A. Charles, P.J. Hakala","submitted_at":"1998-10-03T13:45:00Z","abstract_excerpt":"Using our extensive ROSAT X-ray observations of M33, we confirm a 3.45 day eclipse period for the Einstein source X-7 (Larson & Schulman, 1997) and discover evidence for a 0.31-s pulse period. The orbital period, pulse period and observed X-ray luminosity are remarkably similar to SMC X-1. We therefore suggest M33 X-7 is a neutron star high mass X-ray binary with a 15-40 Msol O/B companion and a binary separation of 25-33 Rsol if the companion is almost filling its Roche lobe."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9810050","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/astro-ph/9810050/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:07:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"utX4m5XQ1XSRc9BemepUEjh7WelJfm2BeTJBAztHt5kDTYT765ltO0GG3BxroZC+EDLPGq93i8S8ZARGedQVDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T04:39:31.938797Z"},"content_sha256":"6258ff3ccc077de48e8623b044776e2c8e54411a50f488a09ab40f2792e0049f","schema_version":"1.0","event_id":"sha256:6258ff3ccc077de48e8623b044776e2c8e54411a50f488a09ab40f2792e0049f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/bundle.json","state_url":"https://pith.science/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-05T04:39:31Z","links":{"resolver":"https://pith.science/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG","bundle":"https://pith.science/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/bundle.json","state":"https://pith.science/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7Y52OC6EOLQUQUOSP3LG7ALDAG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:7Y52OC6EOLQUQUOSP3LG7ALDAG","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":"b345bacfacf5fcb454753421a9d8af004fe627deba52648247e63551dbb766da","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-10-03T13:45:00Z","title_canon_sha256":"3e24a06e3c8e581d0b821e8209d2067047a9bbb626a4aacf4b55f1bf26780382"},"schema_version":"1.0","source":{"id":"astro-ph/9810050","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9810050","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9810050v1","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9810050","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_12","alias_value":"7Y52OC6EOLQU","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_16","alias_value":"7Y52OC6EOLQUQUOS","created_at":"2026-07-04T16:07:04Z"},{"alias_kind":"pith_short_8","alias_value":"7Y52OC6E","created_at":"2026-07-04T16:07:04Z"}],"graph_snapshots":[{"event_id":"sha256:6258ff3ccc077de48e8623b044776e2c8e54411a50f488a09ab40f2792e0049f","target":"graph","created_at":"2026-07-04T16:07:04Z","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/9810050/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Using our extensive ROSAT X-ray observations of M33, we confirm a 3.45 day eclipse period for the Einstein source X-7 (Larson & Schulman, 1997) and discover evidence for a 0.31-s pulse period. The orbital period, pulse period and observed X-ray luminosity are remarkably similar to SMC X-1. We therefore suggest M33 X-7 is a neutron star high mass X-ray binary with a 15-40 Msol O/B companion and a binary separation of 25-33 Rsol if the companion is almost filling its Roche lobe.","authors_text":"E. Kuulkers, G. Dubus, K.S. Long, P.A. Charles, P.J. Hakala","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-10-03T13:45:00Z","title":"The eclipsing X-ray pulsar X-7 in M33"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9810050","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":"sha256:109798c01a0021b430724dd75e638c94420985de3293e082d21a50c1c50ec070","target":"record","created_at":"2026-07-04T16:07:04Z","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":"b345bacfacf5fcb454753421a9d8af004fe627deba52648247e63551dbb766da","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-10-03T13:45:00Z","title_canon_sha256":"3e24a06e3c8e581d0b821e8209d2067047a9bbb626a4aacf4b55f1bf26780382"},"schema_version":"1.0","source":{"id":"astro-ph/9810050","kind":"arxiv","version":1}},"canonical_sha256":"fe3ba70bc472e14851d27ed66f816301a99dea4b5c52b07575e8fdb09c2add92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe3ba70bc472e14851d27ed66f816301a99dea4b5c52b07575e8fdb09c2add92","first_computed_at":"2026-07-04T16:07:04.856420Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:07:04.856420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4SAyaBja97M5rmSTukca4FTr5VB0w2MvwXYYTT2zLXlP5+v6IYjK8XzQmmej9rVpeGq+JyFZ/+1l3xebwkljAw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:07:04.856772Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9810050","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:109798c01a0021b430724dd75e638c94420985de3293e082d21a50c1c50ec070","sha256:6258ff3ccc077de48e8623b044776e2c8e54411a50f488a09ab40f2792e0049f"],"state_sha256":"3aadf9c90335d60cb986609d5a04b867d439973d37a57ec3171a728ac3bccdf4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"22/elvpQPadbtdS7gB1cAwCgWSA6L6R+HNBbVht2crcU5DI2NQJy5brz0SiivCj5khLmb2AhC1KJDLXBfAjkBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T04:39:31.940692Z","bundle_sha256":"8d3a18754e525a66d6b6e7cddfbb3705288782b3837065f3ba779090e71c35f4"}}