{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:FNPJ6W7KC3QL6KCLTB7C7QBLQS","short_pith_number":"pith:FNPJ6W7K","canonical_record":{"source":{"id":"1801.03335","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-01-10T12:18:14Z","cross_cats_sorted":[],"title_canon_sha256":"d690b40dee0f87abfcc65c6d3f37b4d3f48502d52d87db5ad277293753d62ab8","abstract_canon_sha256":"79fbc5d08973622198d8a706e0b80ad95de1b31db05d355965fcf2753f104089"},"schema_version":"1.0"},"canonical_sha256":"2b5e9f5bea16e0bf284b987e2fc02b848997200392457a9aacd265f8bb92807e","source":{"kind":"arxiv","id":"1801.03335","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03335","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03335v2","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03335","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"pith_short_12","alias_value":"FNPJ6W7KC3QL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FNPJ6W7KC3QL6KCL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FNPJ6W7K","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:FNPJ6W7KC3QL6KCLTB7C7QBLQS","target":"record","payload":{"canonical_record":{"source":{"id":"1801.03335","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-01-10T12:18:14Z","cross_cats_sorted":[],"title_canon_sha256":"d690b40dee0f87abfcc65c6d3f37b4d3f48502d52d87db5ad277293753d62ab8","abstract_canon_sha256":"79fbc5d08973622198d8a706e0b80ad95de1b31db05d355965fcf2753f104089"},"schema_version":"1.0"},"canonical_sha256":"2b5e9f5bea16e0bf284b987e2fc02b848997200392457a9aacd265f8bb92807e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:56.778182Z","signature_b64":"wyHsDPDQDGfck5HLsBpjPHt/dmDhY42wH3zfGXPTLfxsRMpybxj4Rd9rFWsx55RzI9a2AgMjPZKvuqEj+cFOBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2b5e9f5bea16e0bf284b987e2fc02b848997200392457a9aacd265f8bb92807e","last_reissued_at":"2026-05-18T00:22:56.777751Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:56.777751Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.03335","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":"2026-05-18T00:22:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kJLehHaCAbO1UhTWD2jsUKTSCRdJNXwCFPWojnGmhIbPXEKyePu3BcP0R4gEZyqGZYx5nrQjbOEsW/n/anc4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:21:26.975536Z"},"content_sha256":"a26096f94afaaa574a688ccbae1804142bf83f6706f4422ddbb3b0ff3c25f586","schema_version":"1.0","event_id":"sha256:a26096f94afaaa574a688ccbae1804142bf83f6706f4422ddbb3b0ff3c25f586"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:FNPJ6W7KC3QL6KCLTB7C7QBLQS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Blazar PG 1553+113 as a Binary System of Supermassive Black Holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alfonso Cavaliere, Andrea Argan, Marco Tavani, Pere Munar-Adrover","submitted_at":"2018-01-10T12:18:14Z","abstract_excerpt":"The BL Lac PG 1553+113 has been continuously monitored in gamma rays with Fermi-LAT for over 9 years. Its updated light curve now includes 5 iterations of a main pattern comprising a high peak and a longer trough, with a period P \\sim 2.2 yr. Our analysis of 2015-2017 data confirms the occurrence in January 2017 of a new peak fitting in the previous trend. In addition, we identify secondary peaks (\"twin peaks\") that occur in closely symmetric pairs on both sides of most main peaks, including the last one; their occurrence is supported by correlated X-ray outbursts. We stress that the above fea"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03335","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":"2026-05-18T00:22:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BCDv1QbJEDD8cHl35ZQpW1QvRGxwiuGLsQ2PvlQJPwiSwSlm+CqTU+9mHS5DGLMXrWa7A87KRDAxt8/baQCXDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T05:21:26.975940Z"},"content_sha256":"b6aa9ec4c7d1e9b18cd63068e41764c76b8a75142d9a81eeeace81fd206f694e","schema_version":"1.0","event_id":"sha256:b6aa9ec4c7d1e9b18cd63068e41764c76b8a75142d9a81eeeace81fd206f694e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/bundle.json","state_url":"https://pith.science/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/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":"2026-05-28T05:21:26Z","links":{"resolver":"https://pith.science/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS","bundle":"https://pith.science/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/bundle.json","state":"https://pith.science/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FNPJ6W7KC3QL6KCLTB7C7QBLQS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FNPJ6W7KC3QL6KCLTB7C7QBLQS","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":"79fbc5d08973622198d8a706e0b80ad95de1b31db05d355965fcf2753f104089","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-01-10T12:18:14Z","title_canon_sha256":"d690b40dee0f87abfcc65c6d3f37b4d3f48502d52d87db5ad277293753d62ab8"},"schema_version":"1.0","source":{"id":"1801.03335","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03335","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03335v2","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03335","created_at":"2026-05-18T00:22:56Z"},{"alias_kind":"pith_short_12","alias_value":"FNPJ6W7KC3QL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"FNPJ6W7KC3QL6KCL","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"FNPJ6W7K","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:b6aa9ec4c7d1e9b18cd63068e41764c76b8a75142d9a81eeeace81fd206f694e","target":"graph","created_at":"2026-05-18T00:22:56Z","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 BL Lac PG 1553+113 has been continuously monitored in gamma rays with Fermi-LAT for over 9 years. Its updated light curve now includes 5 iterations of a main pattern comprising a high peak and a longer trough, with a period P \\sim 2.2 yr. Our analysis of 2015-2017 data confirms the occurrence in January 2017 of a new peak fitting in the previous trend. In addition, we identify secondary peaks (\"twin peaks\") that occur in closely symmetric pairs on both sides of most main peaks, including the last one; their occurrence is supported by correlated X-ray outbursts. We stress that the above fea","authors_text":"Alfonso Cavaliere, Andrea Argan, Marco Tavani, Pere Munar-Adrover","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-01-10T12:18:14Z","title":"The Blazar PG 1553+113 as a Binary System of Supermassive Black Holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03335","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:a26096f94afaaa574a688ccbae1804142bf83f6706f4422ddbb3b0ff3c25f586","target":"record","created_at":"2026-05-18T00:22:56Z","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":"79fbc5d08973622198d8a706e0b80ad95de1b31db05d355965fcf2753f104089","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-01-10T12:18:14Z","title_canon_sha256":"d690b40dee0f87abfcc65c6d3f37b4d3f48502d52d87db5ad277293753d62ab8"},"schema_version":"1.0","source":{"id":"1801.03335","kind":"arxiv","version":2}},"canonical_sha256":"2b5e9f5bea16e0bf284b987e2fc02b848997200392457a9aacd265f8bb92807e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2b5e9f5bea16e0bf284b987e2fc02b848997200392457a9aacd265f8bb92807e","first_computed_at":"2026-05-18T00:22:56.777751Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:56.777751Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wyHsDPDQDGfck5HLsBpjPHt/dmDhY42wH3zfGXPTLfxsRMpybxj4Rd9rFWsx55RzI9a2AgMjPZKvuqEj+cFOBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:56.778182Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.03335","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a26096f94afaaa574a688ccbae1804142bf83f6706f4422ddbb3b0ff3c25f586","sha256:b6aa9ec4c7d1e9b18cd63068e41764c76b8a75142d9a81eeeace81fd206f694e"],"state_sha256":"f1165a5f4ae2cff557f989373fefc65f3c979226929f478c90847f6b1eb45f37"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m++JbO83a5m2hZtEpanfPxA63VlcZbrPZxxP6yXZ2ecOUq9ZgkGqlfxaarFSAt2R12wME0JakFK9hBqP8XjhBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T05:21:26.977917Z","bundle_sha256":"f907b7f79be6ca85321ef788650c9be05c53f3971e3d575ff2b5b49709eb889b"}}