{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:PXHMGO4D34KOWVXUH7Z6TISTZM","short_pith_number":"pith:PXHMGO4D","canonical_record":{"source":{"id":"0912.1571","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-08T19:12:08Z","cross_cats_sorted":[],"title_canon_sha256":"4ea4eb6a4b7585ce9c55b663bd8047dbe045ca77de50df4e3152b486adb8f7e4","abstract_canon_sha256":"2bef7a26026448416fa84587c8209f75a6da2660fbbcf54c71a39035f8dfd002"},"schema_version":"1.0"},"canonical_sha256":"7dcec33b83df14eb56f43ff3e9a253cb16cbf15ced0daf0713d3247f80ccb042","source":{"kind":"arxiv","id":"0912.1571","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.1571","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"arxiv_version","alias_value":"0912.1571v3","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.1571","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"pith_short_12","alias_value":"PXHMGO4D34KO","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"PXHMGO4D34KOWVXU","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"PXHMGO4D","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:PXHMGO4D34KOWVXUH7Z6TISTZM","target":"record","payload":{"canonical_record":{"source":{"id":"0912.1571","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-08T19:12:08Z","cross_cats_sorted":[],"title_canon_sha256":"4ea4eb6a4b7585ce9c55b663bd8047dbe045ca77de50df4e3152b486adb8f7e4","abstract_canon_sha256":"2bef7a26026448416fa84587c8209f75a6da2660fbbcf54c71a39035f8dfd002"},"schema_version":"1.0"},"canonical_sha256":"7dcec33b83df14eb56f43ff3e9a253cb16cbf15ced0daf0713d3247f80ccb042","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:36:18.771932Z","signature_b64":"kZlUEQCJdgR+4Z7iH8fyVmpV92T0cEpdpfu0mC1MoNw/zXI+kacpyHygb0YNoo0dVCYvfwKstw5BGNTQMGXeBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7dcec33b83df14eb56f43ff3e9a253cb16cbf15ced0daf0713d3247f80ccb042","last_reissued_at":"2026-05-18T04:36:18.771440Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:36:18.771440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0912.1571","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:36:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JCTc/Qg/jBPd3ZPKZO7JLXLn+kkg7nmWj1mdHTz9Jh2KZuMuHn3GIpOowAAHqgc8O/1OlDwK+mj8lA56wEcoCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:23:41.546704Z"},"content_sha256":"7c21d01bee12cbee9578ff692e2d3f7558594629a8d5e598d3a3b66913ad8d7d","schema_version":"1.0","event_id":"sha256:7c21d01bee12cbee9578ff692e2d3f7558594629a8d5e598d3a3b66913ad8d7d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:PXHMGO4D34KOWVXUH7Z6TISTZM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evidence for a Black Hole Remnant in the Type IIL Supernova 1979C","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Loeb, C. Jones, D.J. Patnaude","submitted_at":"2009-12-08T19:12:08Z","abstract_excerpt":"We present an analysis of archival X-ray observations of the Type IIL supernova SN 1979C. We find that its X-ray luminosity is remarkably constant at (6.5+/-0.1) x 10^38 erg/s over a period of 12 years between 1995 and 2007. The high and steady luminosity is considered as possible evidence for a stellar-mass (~ 5-10Msun) black hole accreting material from either a supernova fallback disk or from a binary companion, or possibly from emission from a central pulsar wind nebula. We find that the bright and steady X-ray light curve is not consistent with either a model for a supernova powered by ma"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.1571","kind":"arxiv","version":3},"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":"2026-05-18T04:36:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BCgCT08aj2l2WNUxpDe13SsJX1CrZ2eqigpAniJeiOAVvmarsKPHHZFTce7ZfDr9XfqgNKSE1usHEu0TrE75AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:23:41.547054Z"},"content_sha256":"500a019ee382a1f43e1ebd4fc739b6a0deb661e83e68c9f342e62090feb3afb6","schema_version":"1.0","event_id":"sha256:500a019ee382a1f43e1ebd4fc739b6a0deb661e83e68c9f342e62090feb3afb6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/bundle.json","state_url":"https://pith.science/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/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":"2026-06-01T22:23:41Z","links":{"resolver":"https://pith.science/pith/PXHMGO4D34KOWVXUH7Z6TISTZM","bundle":"https://pith.science/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/bundle.json","state":"https://pith.science/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PXHMGO4D34KOWVXUH7Z6TISTZM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:PXHMGO4D34KOWVXUH7Z6TISTZM","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":"2bef7a26026448416fa84587c8209f75a6da2660fbbcf54c71a39035f8dfd002","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-08T19:12:08Z","title_canon_sha256":"4ea4eb6a4b7585ce9c55b663bd8047dbe045ca77de50df4e3152b486adb8f7e4"},"schema_version":"1.0","source":{"id":"0912.1571","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.1571","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"arxiv_version","alias_value":"0912.1571v3","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.1571","created_at":"2026-05-18T04:36:18Z"},{"alias_kind":"pith_short_12","alias_value":"PXHMGO4D34KO","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"PXHMGO4D34KOWVXU","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"PXHMGO4D","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:500a019ee382a1f43e1ebd4fc739b6a0deb661e83e68c9f342e62090feb3afb6","target":"graph","created_at":"2026-05-18T04:36:18Z","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 present an analysis of archival X-ray observations of the Type IIL supernova SN 1979C. We find that its X-ray luminosity is remarkably constant at (6.5+/-0.1) x 10^38 erg/s over a period of 12 years between 1995 and 2007. The high and steady luminosity is considered as possible evidence for a stellar-mass (~ 5-10Msun) black hole accreting material from either a supernova fallback disk or from a binary companion, or possibly from emission from a central pulsar wind nebula. We find that the bright and steady X-ray light curve is not consistent with either a model for a supernova powered by ma","authors_text":"A. Loeb, C. Jones, D.J. Patnaude","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-08T19:12:08Z","title":"Evidence for a Black Hole Remnant in the Type IIL Supernova 1979C"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.1571","kind":"arxiv","version":3},"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":"sha256:7c21d01bee12cbee9578ff692e2d3f7558594629a8d5e598d3a3b66913ad8d7d","target":"record","created_at":"2026-05-18T04:36:18Z","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":"2bef7a26026448416fa84587c8209f75a6da2660fbbcf54c71a39035f8dfd002","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-08T19:12:08Z","title_canon_sha256":"4ea4eb6a4b7585ce9c55b663bd8047dbe045ca77de50df4e3152b486adb8f7e4"},"schema_version":"1.0","source":{"id":"0912.1571","kind":"arxiv","version":3}},"canonical_sha256":"7dcec33b83df14eb56f43ff3e9a253cb16cbf15ced0daf0713d3247f80ccb042","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7dcec33b83df14eb56f43ff3e9a253cb16cbf15ced0daf0713d3247f80ccb042","first_computed_at":"2026-05-18T04:36:18.771440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:36:18.771440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kZlUEQCJdgR+4Z7iH8fyVmpV92T0cEpdpfu0mC1MoNw/zXI+kacpyHygb0YNoo0dVCYvfwKstw5BGNTQMGXeBA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:36:18.771932Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.1571","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7c21d01bee12cbee9578ff692e2d3f7558594629a8d5e598d3a3b66913ad8d7d","sha256:500a019ee382a1f43e1ebd4fc739b6a0deb661e83e68c9f342e62090feb3afb6"],"state_sha256":"e9492c94df1cceaa2bbc793264ecdd1bf20802ccfb9a2732392877dfee21c7ed"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hKwT9N4lkwymKD2Tmmpxh3S56FaAG7s+BNoRA+2817CK/ebNUnwgvJzl2YWHymjUPnNnDW6R941IGgmtkDT2CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T22:23:41.549087Z","bundle_sha256":"d90376ef1895417d4d58341854030a0145101ac0c3ac38df2a75f7c3400f8950"}}