{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2005:XG6W3FUL5JCCPLFHSHCKYOGUCS","short_pith_number":"pith:XG6W3FUL","canonical_record":{"source":{"id":"astro-ph/0508302","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-08-14T15:20:01Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"e48726a0d222bf91e0a60beda684f3bf9ea81224949619dd5c1a63894e8b7610","abstract_canon_sha256":"b9ef24b112065447accc23383ba797a1c2b45e4df799e87ec680021a0de22ad9"},"schema_version":"1.0"},"canonical_sha256":"b9bd6d968bea4427aca791c4ac38d414a1dc2e16ab9f165a43e6eb8fa425d903","source":{"kind":"arxiv","id":"astro-ph/0508302","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0508302","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0508302v2","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0508302","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_12","alias_value":"XG6W3FUL5JCC","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_16","alias_value":"XG6W3FUL5JCCPLFH","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_8","alias_value":"XG6W3FUL","created_at":"2026-07-04T17:15:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2005:XG6W3FUL5JCCPLFHSHCKYOGUCS","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0508302","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-08-14T15:20:01Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"e48726a0d222bf91e0a60beda684f3bf9ea81224949619dd5c1a63894e8b7610","abstract_canon_sha256":"b9ef24b112065447accc23383ba797a1c2b45e4df799e87ec680021a0de22ad9"},"schema_version":"1.0"},"canonical_sha256":"b9bd6d968bea4427aca791c4ac38d414a1dc2e16ab9f165a43e6eb8fa425d903","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:15:00.555218Z","signature_b64":"ZSjz/y6w15MklnyjDerhxI1+KifFhvEu8GsKg1RfxJ3qzw9Q4Rv1X965peeZ3QRJlfhA35WZXb272ps1s9EXDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b9bd6d968bea4427aca791c4ac38d414a1dc2e16ab9f165a43e6eb8fa425d903","last_reissued_at":"2026-07-04T17:15:00.554726Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:15:00.554726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0508302","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:15:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BAYanVWAAexBWkv11EPRC82U+Y5xG5V5dY42vIonASb+uHGhFoxcyBUT8WZ9Hx1oRwPXGmmF/G4aCmeVDhWdBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T23:26:06.529205Z"},"content_sha256":"f17f022adfee841560ed4c693f202291d95403aa4c6063e95d850fa6a07d49d6","schema_version":"1.0","event_id":"sha256:f17f022adfee841560ed4c693f202291d95403aa4c6063e95d850fa6a07d49d6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2005:XG6W3FUL5JCCPLFHSHCKYOGUCS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum","license":"","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph","authors_text":"Jeffrey E. McClintock, Li-Xin Li, Ramesh Narayan, Rebecca Shafee, Ronald A. Remillard, Shane W. Davis","submitted_at":"2005-08-14T15:20:01Z","abstract_excerpt":"We fit X-ray spectral data in the thermal dominant or high soft state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin parameters a* = a/M of the two holes. For GRO J1655-40, using a spectral hardening factor computed for a non-LTE relativistic accretion disk, we estimate a* ~ 0.75 and ~ 0.65-0.75, respectively, from ASCA and RXTE data. For 4U 1543-47, we estimate a* ~ 0.75-0.85 from RXTE data. Thus, neither black hole has a spin approaching the theoretical maximum a* = 1."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0508302","kind":"arxiv","version":2},"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/0508302/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":"2026-07-04T17:15:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mtmcsx1h7Xkwq8Amtq/Kz1JpWTp7N3/HSS3/k6l7sIcgqhqdQWdVIm4WnQ47J+o1McdEoTl2HipOUytjk6ExDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T23:26:06.530051Z"},"content_sha256":"4ff541f89d9494bc8c12afa5027168d41a64db9e2ed93b27813b94dd2b9917cd","schema_version":"1.0","event_id":"sha256:4ff541f89d9494bc8c12afa5027168d41a64db9e2ed93b27813b94dd2b9917cd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/bundle.json","state_url":"https://pith.science/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/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":"2026-08-07T23:26:06Z","links":{"resolver":"https://pith.science/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS","bundle":"https://pith.science/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/bundle.json","state":"https://pith.science/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XG6W3FUL5JCCPLFHSHCKYOGUCS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:XG6W3FUL5JCCPLFHSHCKYOGUCS","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":"b9ef24b112065447accc23383ba797a1c2b45e4df799e87ec680021a0de22ad9","cross_cats_sorted":["gr-qc"],"license":"","primary_cat":"astro-ph","submitted_at":"2005-08-14T15:20:01Z","title_canon_sha256":"e48726a0d222bf91e0a60beda684f3bf9ea81224949619dd5c1a63894e8b7610"},"schema_version":"1.0","source":{"id":"astro-ph/0508302","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0508302","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0508302v2","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0508302","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_12","alias_value":"XG6W3FUL5JCC","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_16","alias_value":"XG6W3FUL5JCCPLFH","created_at":"2026-07-04T17:15:00Z"},{"alias_kind":"pith_short_8","alias_value":"XG6W3FUL","created_at":"2026-07-04T17:15:00Z"}],"graph_snapshots":[{"event_id":"sha256:4ff541f89d9494bc8c12afa5027168d41a64db9e2ed93b27813b94dd2b9917cd","target":"graph","created_at":"2026-07-04T17:15:00Z","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/0508302/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We fit X-ray spectral data in the thermal dominant or high soft state of two dynamically confirmed black holes, GRO J1655-40 and 4U 1543-47, and estimate the dimensionless spin parameters a* = a/M of the two holes. For GRO J1655-40, using a spectral hardening factor computed for a non-LTE relativistic accretion disk, we estimate a* ~ 0.75 and ~ 0.65-0.75, respectively, from ASCA and RXTE data. For 4U 1543-47, we estimate a* ~ 0.75-0.85 from RXTE data. Thus, neither black hole has a spin approaching the theoretical maximum a* = 1.","authors_text":"Jeffrey E. McClintock, Li-Xin Li, Ramesh Narayan, Rebecca Shafee, Ronald A. Remillard, Shane W. Davis","cross_cats":["gr-qc"],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-08-14T15:20:01Z","title":"Estimating the Spin of Stellar-Mass Black Holes via Spectral Fitting of the X-ray Continuum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0508302","kind":"arxiv","version":2},"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:f17f022adfee841560ed4c693f202291d95403aa4c6063e95d850fa6a07d49d6","target":"record","created_at":"2026-07-04T17:15:00Z","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":"b9ef24b112065447accc23383ba797a1c2b45e4df799e87ec680021a0de22ad9","cross_cats_sorted":["gr-qc"],"license":"","primary_cat":"astro-ph","submitted_at":"2005-08-14T15:20:01Z","title_canon_sha256":"e48726a0d222bf91e0a60beda684f3bf9ea81224949619dd5c1a63894e8b7610"},"schema_version":"1.0","source":{"id":"astro-ph/0508302","kind":"arxiv","version":2}},"canonical_sha256":"b9bd6d968bea4427aca791c4ac38d414a1dc2e16ab9f165a43e6eb8fa425d903","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b9bd6d968bea4427aca791c4ac38d414a1dc2e16ab9f165a43e6eb8fa425d903","first_computed_at":"2026-07-04T17:15:00.554726Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:15:00.554726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZSjz/y6w15MklnyjDerhxI1+KifFhvEu8GsKg1RfxJ3qzw9Q4Rv1X965peeZ3QRJlfhA35WZXb272ps1s9EXDw==","signature_status":"signed_v1","signed_at":"2026-07-04T17:15:00.555218Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0508302","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f17f022adfee841560ed4c693f202291d95403aa4c6063e95d850fa6a07d49d6","sha256:4ff541f89d9494bc8c12afa5027168d41a64db9e2ed93b27813b94dd2b9917cd"],"state_sha256":"bd57dea274f66ff64d5dc49f4c1fd14ee103d6dbfb5a5dfe84eaed8e87b9a140"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+QMzQyOfyshTpslBaBiGiIrl60eyVt7wLHwbt12+HHcJNCDHUqg2zUCP1nqzjBAeFNOD9v8aP61yIQ78OwicCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T23:26:06.535446Z","bundle_sha256":"b8fc7df9a895bafeb881644e4df08ab2cdf5364fff4f123a8fe5e31a3c35ff90"}}