{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:TAV7AMQ4DC5XJCWY3VMDK243OP","short_pith_number":"pith:TAV7AMQ4","canonical_record":{"source":{"id":"1603.07090","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-23T08:39:31Z","cross_cats_sorted":[],"title_canon_sha256":"c6562b1d2d238ffdc2f26cd5e55724c61ec62c894cae9ce2d7985bac0179ac14","abstract_canon_sha256":"637521628a5f14c5c3173398d52e2f3c0c910e2cb1c3d86d73e1756f8f0c3e8a"},"schema_version":"1.0"},"canonical_sha256":"982bf0321c18bb748ad8dd58356b9b73ea1889f3f5aabf9d3c69e36e2d64dfa0","source":{"kind":"arxiv","id":"1603.07090","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.07090","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"arxiv_version","alias_value":"1603.07090v2","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.07090","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"pith_short_12","alias_value":"TAV7AMQ4DC5X","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"TAV7AMQ4DC5XJCWY","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"TAV7AMQ4","created_at":"2026-05-18T12:30:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:TAV7AMQ4DC5XJCWY3VMDK243OP","target":"record","payload":{"canonical_record":{"source":{"id":"1603.07090","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-23T08:39:31Z","cross_cats_sorted":[],"title_canon_sha256":"c6562b1d2d238ffdc2f26cd5e55724c61ec62c894cae9ce2d7985bac0179ac14","abstract_canon_sha256":"637521628a5f14c5c3173398d52e2f3c0c910e2cb1c3d86d73e1756f8f0c3e8a"},"schema_version":"1.0"},"canonical_sha256":"982bf0321c18bb748ad8dd58356b9b73ea1889f3f5aabf9d3c69e36e2d64dfa0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:53.733247Z","signature_b64":"JM0iwJkX3sC0CGTATEWhv6kqkQ4xQGjxG1WsYV91cVN2UOR9MLaLA26suRzZeBZ+WKMBv5rm2mlq3v3UYLN2BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"982bf0321c18bb748ad8dd58356b9b73ea1889f3f5aabf9d3c69e36e2d64dfa0","last_reissued_at":"2026-05-18T01:13:53.732514Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:53.732514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1603.07090","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":"2026-05-18T01:13:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T0kcNPvLFiOxMs8sUuf3RnwylTDgFz7UwqqzG55E/0IBZmVWM+gNmElq1QyuyLoAPtnKb7/yVfvOwxCKIihrCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T11:11:57.880606Z"},"content_sha256":"b6fbb1c62f61ee9d91f7c493597d29187c4ca0811b9fa46608dd6b8b6e08c4be","schema_version":"1.0","event_id":"sha256:b6fbb1c62f61ee9d91f7c493597d29187c4ca0811b9fa46608dd6b8b6e08c4be"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:TAV7AMQ4DC5XJCWY3VMDK243OP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Continued decay in the cyclotron line energy in Hercules X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"D. Klochkov, F.A. Harrison, J. Wilms, R. Staubert, V. Vybornov","submitted_at":"2016-03-23T08:39:31Z","abstract_excerpt":"The centroid energy Ecyc of the cyclotron line in the spectrum of the binary X-ray pulsar Her X-1 had been found to decrease with time on a time scale of a few tens of years - surprisingly short astrophysically. This was found for the pulse phase averaged line centroid energy using observational data from various X-ray satellites over the time frame 1996 to 2012, establishing a reduction of about 4 keV. Here we report on the result of a new observation by NuSTAR performed in August 2015. The earlier results are confirmed and strengthened, with respect to both, the dependence of Ecyc on flux (i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.07090","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":""},"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":"2026-05-18T01:13:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yXiQH4LkhLkReBzE/WUOf7924YwWaHfwJH7U1pi0bLMB/X8UBRiuxf1QLopbRmOzrux2seX035hrXEnHVnjNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T11:11:57.881307Z"},"content_sha256":"fa3ce657f2b7197d0fb0374074a719c5facbb26660af92f2783bddf1d06dae8e","schema_version":"1.0","event_id":"sha256:fa3ce657f2b7197d0fb0374074a719c5facbb26660af92f2783bddf1d06dae8e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/bundle.json","state_url":"https://pith.science/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/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":"2026-05-25T11:11:57Z","links":{"resolver":"https://pith.science/pith/TAV7AMQ4DC5XJCWY3VMDK243OP","bundle":"https://pith.science/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/bundle.json","state":"https://pith.science/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TAV7AMQ4DC5XJCWY3VMDK243OP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:TAV7AMQ4DC5XJCWY3VMDK243OP","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":"637521628a5f14c5c3173398d52e2f3c0c910e2cb1c3d86d73e1756f8f0c3e8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-23T08:39:31Z","title_canon_sha256":"c6562b1d2d238ffdc2f26cd5e55724c61ec62c894cae9ce2d7985bac0179ac14"},"schema_version":"1.0","source":{"id":"1603.07090","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.07090","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"arxiv_version","alias_value":"1603.07090v2","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.07090","created_at":"2026-05-18T01:13:53Z"},{"alias_kind":"pith_short_12","alias_value":"TAV7AMQ4DC5X","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"TAV7AMQ4DC5XJCWY","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"TAV7AMQ4","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:fa3ce657f2b7197d0fb0374074a719c5facbb26660af92f2783bddf1d06dae8e","target":"graph","created_at":"2026-05-18T01:13:53Z","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":"The centroid energy Ecyc of the cyclotron line in the spectrum of the binary X-ray pulsar Her X-1 had been found to decrease with time on a time scale of a few tens of years - surprisingly short astrophysically. This was found for the pulse phase averaged line centroid energy using observational data from various X-ray satellites over the time frame 1996 to 2012, establishing a reduction of about 4 keV. Here we report on the result of a new observation by NuSTAR performed in August 2015. The earlier results are confirmed and strengthened, with respect to both, the dependence of Ecyc on flux (i","authors_text":"D. Klochkov, F.A. Harrison, J. Wilms, R. Staubert, V. Vybornov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-23T08:39:31Z","title":"Continued decay in the cyclotron line energy in Hercules X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.07090","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:b6fbb1c62f61ee9d91f7c493597d29187c4ca0811b9fa46608dd6b8b6e08c4be","target":"record","created_at":"2026-05-18T01:13:53Z","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":"637521628a5f14c5c3173398d52e2f3c0c910e2cb1c3d86d73e1756f8f0c3e8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-03-23T08:39:31Z","title_canon_sha256":"c6562b1d2d238ffdc2f26cd5e55724c61ec62c894cae9ce2d7985bac0179ac14"},"schema_version":"1.0","source":{"id":"1603.07090","kind":"arxiv","version":2}},"canonical_sha256":"982bf0321c18bb748ad8dd58356b9b73ea1889f3f5aabf9d3c69e36e2d64dfa0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"982bf0321c18bb748ad8dd58356b9b73ea1889f3f5aabf9d3c69e36e2d64dfa0","first_computed_at":"2026-05-18T01:13:53.732514Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:53.732514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JM0iwJkX3sC0CGTATEWhv6kqkQ4xQGjxG1WsYV91cVN2UOR9MLaLA26suRzZeBZ+WKMBv5rm2mlq3v3UYLN2BA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:53.733247Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.07090","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6fbb1c62f61ee9d91f7c493597d29187c4ca0811b9fa46608dd6b8b6e08c4be","sha256:fa3ce657f2b7197d0fb0374074a719c5facbb26660af92f2783bddf1d06dae8e"],"state_sha256":"6f57f3524728b046b6e1b2ef3fe312fcce83970283f4685085865f622d80f702"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZYfg47aIYezFKw2m0PZxFPpthCE68v7dzV08yeTqxIk31JIJWmNgH75sT9Qg8wqMk3U1DHmQfWT1fQI4fCkYAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T11:11:57.885125Z","bundle_sha256":"fde497ed46443971b587f120364e6a49f6299ecea3cc9daf7d72e25d97ae5070"}}