{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:NZI4VTHVP7J6PSVUGF72TO5PYB","short_pith_number":"pith:NZI4VTHV","canonical_record":{"source":{"id":"1008.2896","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-08-17T13:41:57Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"26ba5d4897be4c429ccf4acbbda2eadb6804932b4672d69f36b1457d5e2621b7","abstract_canon_sha256":"ba85f636ee42acbe97660e40de3b8660924d66c85c1918700ffed01f5a3d74b3"},"schema_version":"1.0"},"canonical_sha256":"6e51caccf57fd3e7cab4317fa9bbafc05c58ccfdb73a6dfe829287ff93110a72","source":{"kind":"arxiv","id":"1008.2896","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.2896","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"arxiv_version","alias_value":"1008.2896v1","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.2896","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"pith_short_12","alias_value":"NZI4VTHVP7J6","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"NZI4VTHVP7J6PSVU","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"NZI4VTHV","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:NZI4VTHVP7J6PSVUGF72TO5PYB","target":"record","payload":{"canonical_record":{"source":{"id":"1008.2896","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-08-17T13:41:57Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"26ba5d4897be4c429ccf4acbbda2eadb6804932b4672d69f36b1457d5e2621b7","abstract_canon_sha256":"ba85f636ee42acbe97660e40de3b8660924d66c85c1918700ffed01f5a3d74b3"},"schema_version":"1.0"},"canonical_sha256":"6e51caccf57fd3e7cab4317fa9bbafc05c58ccfdb73a6dfe829287ff93110a72","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:47.497562Z","signature_b64":"v7j78PRGNfL2ze8sY8NYrK7vwfql/kLgEIkfGxMvhJixmsQuU3YTcYTHAVJg33thEJYppLEVfCoTEyoorF58Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6e51caccf57fd3e7cab4317fa9bbafc05c58ccfdb73a6dfe829287ff93110a72","last_reissued_at":"2026-05-18T02:05:47.496848Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:47.496848Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.2896","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":"2026-05-18T02:05:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qKnD0EuVNKfTDgHnpglul+K/zjuBjz1fnV/NxMjxF9/X4jpDVY2ZgWAKZXC5bWOIz1t9Z4SSp9+0bxgWuvTcAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T04:50:27.854733Z"},"content_sha256":"91bbf4a9a5fce892b00f32c2efcf08f61835e20221677c714784fb8fa1313e94","schema_version":"1.0","event_id":"sha256:91bbf4a9a5fce892b00f32c2efcf08f61835e20221677c714784fb8fa1313e94"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:NZI4VTHVP7J6PSVUGF72TO5PYB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new globular cluster black hole in NGC 4472","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"Arunav Kundu (Eureka Scientific), Katherine L. Rhode (Indiana University), Stephen E. Zepf (Michigan State University), Thomas J. Maccarone (University of Southampton)","submitted_at":"2010-08-17T13:41:57Z","abstract_excerpt":"We discuss CXOU~1229410+075744, a new black hole candidate in a globular cluster in the elliptical galaxy NGC~4472. By comparing two Chandra observations of the galaxy, we find a source that varies by at least a factor of 4, and has a peak luminosity of at least $2\\times10^{39}$ ergs/sec. As such, the source varies by significantly more than the Eddington luminosity for a single neutron star, and is a strong candidate for being a globular cluster black hole. The source's X-ray spectrum also evolves in a manner consistent with what would be expected from a single accreting stellar mass black ho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.2896","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":""},"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":"2026-05-18T02:05:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GqxQKb56hlqzpGoTxXdj/i5pVsl2k9X4DFJpOd9wJFCaquDmIUlaETP+YbeO5EUvP8u661QUW/S2yRgpQ4dmAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T04:50:27.855097Z"},"content_sha256":"6361eb10aa808efe40578acda6c73d453eeb42b42b103a9164f03f74c3e27f9e","schema_version":"1.0","event_id":"sha256:6361eb10aa808efe40578acda6c73d453eeb42b42b103a9164f03f74c3e27f9e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/bundle.json","state_url":"https://pith.science/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/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":"2026-05-24T04:50:27Z","links":{"resolver":"https://pith.science/pith/NZI4VTHVP7J6PSVUGF72TO5PYB","bundle":"https://pith.science/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/bundle.json","state":"https://pith.science/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NZI4VTHVP7J6PSVUGF72TO5PYB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:NZI4VTHVP7J6PSVUGF72TO5PYB","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":"ba85f636ee42acbe97660e40de3b8660924d66c85c1918700ffed01f5a3d74b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-08-17T13:41:57Z","title_canon_sha256":"26ba5d4897be4c429ccf4acbbda2eadb6804932b4672d69f36b1457d5e2621b7"},"schema_version":"1.0","source":{"id":"1008.2896","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.2896","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"arxiv_version","alias_value":"1008.2896v1","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.2896","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"pith_short_12","alias_value":"NZI4VTHVP7J6","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"NZI4VTHVP7J6PSVU","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"NZI4VTHV","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:6361eb10aa808efe40578acda6c73d453eeb42b42b103a9164f03f74c3e27f9e","target":"graph","created_at":"2026-05-18T02:05:47Z","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"},"paper":{"abstract_excerpt":"We discuss CXOU~1229410+075744, a new black hole candidate in a globular cluster in the elliptical galaxy NGC~4472. By comparing two Chandra observations of the galaxy, we find a source that varies by at least a factor of 4, and has a peak luminosity of at least $2\\times10^{39}$ ergs/sec. As such, the source varies by significantly more than the Eddington luminosity for a single neutron star, and is a strong candidate for being a globular cluster black hole. The source's X-ray spectrum also evolves in a manner consistent with what would be expected from a single accreting stellar mass black ho","authors_text":"Arunav Kundu (Eureka Scientific), Katherine L. Rhode (Indiana University), Stephen E. Zepf (Michigan State University), Thomas J. Maccarone (University of Southampton)","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-08-17T13:41:57Z","title":"A new globular cluster black hole in NGC 4472"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.2896","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":"sha256:91bbf4a9a5fce892b00f32c2efcf08f61835e20221677c714784fb8fa1313e94","target":"record","created_at":"2026-05-18T02:05:47Z","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":"ba85f636ee42acbe97660e40de3b8660924d66c85c1918700ffed01f5a3d74b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-08-17T13:41:57Z","title_canon_sha256":"26ba5d4897be4c429ccf4acbbda2eadb6804932b4672d69f36b1457d5e2621b7"},"schema_version":"1.0","source":{"id":"1008.2896","kind":"arxiv","version":1}},"canonical_sha256":"6e51caccf57fd3e7cab4317fa9bbafc05c58ccfdb73a6dfe829287ff93110a72","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6e51caccf57fd3e7cab4317fa9bbafc05c58ccfdb73a6dfe829287ff93110a72","first_computed_at":"2026-05-18T02:05:47.496848Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:47.496848Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v7j78PRGNfL2ze8sY8NYrK7vwfql/kLgEIkfGxMvhJixmsQuU3YTcYTHAVJg33thEJYppLEVfCoTEyoorF58Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:47.497562Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.2896","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:91bbf4a9a5fce892b00f32c2efcf08f61835e20221677c714784fb8fa1313e94","sha256:6361eb10aa808efe40578acda6c73d453eeb42b42b103a9164f03f74c3e27f9e"],"state_sha256":"1c80cdfe265fb118b40d3ec39e1cd12268f52532130d7b49c33e926179046445"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IH4RdsIRHJdymp+Z6J7HvS09pxHuaM3vYfJdDCWv6muxai1TU+/8tE2ckSArFUJnwPoBFNgCucgT4DSIqAJrAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T04:50:27.857278Z","bundle_sha256":"849c496c5d65376ce3199b218d940ea1d3202c6c34faeaaa98450b419a936306"}}