{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:DGIH6Z4LJPRTOLP4H3RCFZ3ENC","short_pith_number":"pith:DGIH6Z4L","canonical_record":{"source":{"id":"1608.06429","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-23T09:22:33Z","cross_cats_sorted":[],"title_canon_sha256":"bda74976b06f615db754461e0bf31daf2e9be6ae72b817db709bf8dfe58cf224","abstract_canon_sha256":"947983767f69d2b5ec9c6bcab6f486e45710e3dafba96506dcd0c68599f5e0cd"},"schema_version":"1.0"},"canonical_sha256":"19907f678b4be3372dfc3ee222e76468951f55c5c15b768ba72d0eef535b61df","source":{"kind":"arxiv","id":"1608.06429","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.06429","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"arxiv_version","alias_value":"1608.06429v1","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.06429","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"pith_short_12","alias_value":"DGIH6Z4LJPRT","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"DGIH6Z4LJPRTOLP4","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"DGIH6Z4L","created_at":"2026-05-18T12:30:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:DGIH6Z4LJPRTOLP4H3RCFZ3ENC","target":"record","payload":{"canonical_record":{"source":{"id":"1608.06429","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-23T09:22:33Z","cross_cats_sorted":[],"title_canon_sha256":"bda74976b06f615db754461e0bf31daf2e9be6ae72b817db709bf8dfe58cf224","abstract_canon_sha256":"947983767f69d2b5ec9c6bcab6f486e45710e3dafba96506dcd0c68599f5e0cd"},"schema_version":"1.0"},"canonical_sha256":"19907f678b4be3372dfc3ee222e76468951f55c5c15b768ba72d0eef535b61df","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:15.315376Z","signature_b64":"WOxRuzqBoZmDKhzjl5Wva498Hf47JWdwfwYQNyXoGHgb5UJN8MtHRYddLkXZLmK6S1nT5rfZsTV5/mDaNxy2Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"19907f678b4be3372dfc3ee222e76468951f55c5c15b768ba72d0eef535b61df","last_reissued_at":"2026-05-18T01:07:15.314617Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:15.314617Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.06429","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":"2026-05-18T01:07:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YV+EuN9pGGFnhEeSpExbInhhO4j+DyEMyevuZM2MmQuorj9hANZORNM8c343/0jMt6eGTDUBFpMa3CDjZM0bAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T06:25:28.157337Z"},"content_sha256":"b4780fdd22fc7c338d077aa2c806b2f7380e6396a8a12b9a16b8ede84426c9f7","schema_version":"1.0","event_id":"sha256:b4780fdd22fc7c338d077aa2c806b2f7380e6396a8a12b9a16b8ede84426c9f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:DGIH6Z4LJPRTOLP4H3RCFZ3ENC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Swift-BAT monitoring reveals a long term decay of the cyclotron line energy in Vela X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. D'A\\`i (INAF, A. Segreto, G. Cusumano, IASF Palermo), V. La Parola","submitted_at":"2016-08-23T09:22:33Z","abstract_excerpt":"We study the behaviour of the cyclotron resonant scattering feature (CRSF) of the high mass X-ray binary Vela X-1 using the long-term hard X-ray monitoring performed by the Burst Alert Telescope (BAT) on board Swift. High statistics, intensity selected spectra were built along 11 years of BAT survey. While the fundamental line is not revealed, the second harmonic of the CRSF can be clearly detected in all the spectra, at an energy varying between $\\sim 53$ keV and $\\sim 58$ keV, directly correlated with the luminosity. We have further investigated the evolution of the CRSF in time, by studying"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.06429","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":"2026-05-18T01:07:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eXJTPIp+enstMux8E/0GN7X9Ir0EW6ObZJi0a2aNvRV/wRXBlWmpjWz6zd2hm/LqAK0XtB4bFnlYA/2b+8h/BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T06:25:28.158025Z"},"content_sha256":"72b2d7242ae37f6013208501adb41dbccd33f13d56c5d7142dd1976be9159691","schema_version":"1.0","event_id":"sha256:72b2d7242ae37f6013208501adb41dbccd33f13d56c5d7142dd1976be9159691"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/bundle.json","state_url":"https://pith.science/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/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":"2026-05-23T06:25:28Z","links":{"resolver":"https://pith.science/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC","bundle":"https://pith.science/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/bundle.json","state":"https://pith.science/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DGIH6Z4LJPRTOLP4H3RCFZ3ENC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:DGIH6Z4LJPRTOLP4H3RCFZ3ENC","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":"947983767f69d2b5ec9c6bcab6f486e45710e3dafba96506dcd0c68599f5e0cd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-23T09:22:33Z","title_canon_sha256":"bda74976b06f615db754461e0bf31daf2e9be6ae72b817db709bf8dfe58cf224"},"schema_version":"1.0","source":{"id":"1608.06429","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.06429","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"arxiv_version","alias_value":"1608.06429v1","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.06429","created_at":"2026-05-18T01:07:15Z"},{"alias_kind":"pith_short_12","alias_value":"DGIH6Z4LJPRT","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"DGIH6Z4LJPRTOLP4","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"DGIH6Z4L","created_at":"2026-05-18T12:30:12Z"}],"graph_snapshots":[{"event_id":"sha256:72b2d7242ae37f6013208501adb41dbccd33f13d56c5d7142dd1976be9159691","target":"graph","created_at":"2026-05-18T01:07:15Z","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 study the behaviour of the cyclotron resonant scattering feature (CRSF) of the high mass X-ray binary Vela X-1 using the long-term hard X-ray monitoring performed by the Burst Alert Telescope (BAT) on board Swift. High statistics, intensity selected spectra were built along 11 years of BAT survey. While the fundamental line is not revealed, the second harmonic of the CRSF can be clearly detected in all the spectra, at an energy varying between $\\sim 53$ keV and $\\sim 58$ keV, directly correlated with the luminosity. We have further investigated the evolution of the CRSF in time, by studying","authors_text":"A. D'A\\`i (INAF, A. Segreto, G. Cusumano, IASF Palermo), V. La Parola","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-23T09:22:33Z","title":"The Swift-BAT monitoring reveals a long term decay of the cyclotron line energy in Vela X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.06429","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:b4780fdd22fc7c338d077aa2c806b2f7380e6396a8a12b9a16b8ede84426c9f7","target":"record","created_at":"2026-05-18T01:07:15Z","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":"947983767f69d2b5ec9c6bcab6f486e45710e3dafba96506dcd0c68599f5e0cd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-08-23T09:22:33Z","title_canon_sha256":"bda74976b06f615db754461e0bf31daf2e9be6ae72b817db709bf8dfe58cf224"},"schema_version":"1.0","source":{"id":"1608.06429","kind":"arxiv","version":1}},"canonical_sha256":"19907f678b4be3372dfc3ee222e76468951f55c5c15b768ba72d0eef535b61df","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"19907f678b4be3372dfc3ee222e76468951f55c5c15b768ba72d0eef535b61df","first_computed_at":"2026-05-18T01:07:15.314617Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:15.314617Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WOxRuzqBoZmDKhzjl5Wva498Hf47JWdwfwYQNyXoGHgb5UJN8MtHRYddLkXZLmK6S1nT5rfZsTV5/mDaNxy2Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:15.315376Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.06429","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b4780fdd22fc7c338d077aa2c806b2f7380e6396a8a12b9a16b8ede84426c9f7","sha256:72b2d7242ae37f6013208501adb41dbccd33f13d56c5d7142dd1976be9159691"],"state_sha256":"d5f03c07b946ced6f6e2918e6dd40f76cd4263357797f087ef4144583052553f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1bFU/b3MzUzpxi2xEwI7fEnNUU4N6jr2qNkSFWmY0YXkFz5pvDYQxV5qxdbqjMWyDm1u+KKP/9eHSj2wz7PcBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T06:25:28.161849Z","bundle_sha256":"06e8f05e888aab844b2f29dd5faf9831dea15c2115c7f805b753eccc7f70d2ab"}}