{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:7DPEZWTX4R46IXWJ64GRZGR6BD","short_pith_number":"pith:7DPEZWTX","canonical_record":{"source":{"id":"2003.11280","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-03-25T08:55:01Z","cross_cats_sorted":[],"title_canon_sha256":"1bfa8d46c1abcdf663184b21edf56db51e768507a0ac1d8adbb3f050c1b82e10","abstract_canon_sha256":"f50cf1dfc53918420d732fc88bffc3cc5a474f92d01e017fc54ead798744cb73"},"schema_version":"1.0"},"canonical_sha256":"f8de4cda77e479e45ec9f70d1c9a3e08f28139c25b69960c2dd943cc7daf029f","source":{"kind":"arxiv","id":"2003.11280","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.11280","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"arxiv_version","alias_value":"2003.11280v1","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.11280","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_12","alias_value":"7DPEZWTX4R46","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_16","alias_value":"7DPEZWTX4R46IXWJ","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_8","alias_value":"7DPEZWTX","created_at":"2026-07-05T00:51:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:7DPEZWTX4R46IXWJ64GRZGR6BD","target":"record","payload":{"canonical_record":{"source":{"id":"2003.11280","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-03-25T08:55:01Z","cross_cats_sorted":[],"title_canon_sha256":"1bfa8d46c1abcdf663184b21edf56db51e768507a0ac1d8adbb3f050c1b82e10","abstract_canon_sha256":"f50cf1dfc53918420d732fc88bffc3cc5a474f92d01e017fc54ead798744cb73"},"schema_version":"1.0"},"canonical_sha256":"f8de4cda77e479e45ec9f70d1c9a3e08f28139c25b69960c2dd943cc7daf029f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:51:44.213004Z","signature_b64":"4pj/pOO0NWu47mFxeVmy79YwTTmTrS03IsTOoVrOWi38Z5HW+ZzpyhQuJq9M5WCiDqbuNw3FpTlwnBxl5u/VBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8de4cda77e479e45ec9f70d1c9a3e08f28139c25b69960c2dd943cc7daf029f","last_reissued_at":"2026-07-05T00:51:44.212643Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:51:44.212643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.11280","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":"2026-07-05T00:51:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HPioSHVqv/sfNxV1TqVYtx3Cl3Dy6kPmcNYmD9yE8y3W/VxVcHPkCwRs51WNSvBtx11XKtZQhAV+Cp8VjrVoDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T09:03:56.200534Z"},"content_sha256":"7bc79e2431172ab1078d4a536b65f911c9a8942c4708d88404fa142ea19983de","schema_version":"1.0","event_id":"sha256:7bc79e2431172ab1078d4a536b65f911c9a8942c4708d88404fa142ea19983de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:7DPEZWTX4R46IXWJ64GRZGR6BD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The gamma-ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4-4350","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Haiming Zhang, Huaizhen Li, Li Ma, Lisheng Mao, Tingfeng Yi, Xing Yang, Yan Zhang","submitted_at":"2020-03-25T08:55:01Z","abstract_excerpt":"We have assembled the historical light curves of the BL Lac Object 3FGL J0449.4-4350 at optical and gamma-ray bands, the time spanning about 10 years, analyzed the periodic variability of the light curves by using four different methods (Lomb-Scargle periodogram, REDFIT38, Jurkevich and DACF). We detected a marginally possible quasi-periodic oscillation (QPO) of ~450 days. Assuming it originates from the helical motion jet in a supermassive binary black hole (SMBBH) system undergoing major merger, we estimate the primary black hole mass M~7.7*10^{9} M_sun. To explore the origin of the gamma-ra"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.11280","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2003.11280/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":"2026-07-05T00:51:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Vc8Ym3/dNQdvWY+uPgh9OrvsawgcZFwlrnH7s0tJQmunkWSnmGUXyvUKI30c2jbI3NsfyVTy6nfow3nh/dTVAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T09:03:56.200893Z"},"content_sha256":"819e005446a3d38579fd3800b15bbf7304c6bb8f6b9d109d062066785c474e00","schema_version":"1.0","event_id":"sha256:819e005446a3d38579fd3800b15bbf7304c6bb8f6b9d109d062066785c474e00"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/bundle.json","state_url":"https://pith.science/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/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":"2026-07-05T09:03:56Z","links":{"resolver":"https://pith.science/pith/7DPEZWTX4R46IXWJ64GRZGR6BD","bundle":"https://pith.science/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/bundle.json","state":"https://pith.science/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7DPEZWTX4R46IXWJ64GRZGR6BD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:7DPEZWTX4R46IXWJ64GRZGR6BD","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":"f50cf1dfc53918420d732fc88bffc3cc5a474f92d01e017fc54ead798744cb73","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-03-25T08:55:01Z","title_canon_sha256":"1bfa8d46c1abcdf663184b21edf56db51e768507a0ac1d8adbb3f050c1b82e10"},"schema_version":"1.0","source":{"id":"2003.11280","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.11280","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"arxiv_version","alias_value":"2003.11280v1","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.11280","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_12","alias_value":"7DPEZWTX4R46","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_16","alias_value":"7DPEZWTX4R46IXWJ","created_at":"2026-07-05T00:51:44Z"},{"alias_kind":"pith_short_8","alias_value":"7DPEZWTX","created_at":"2026-07-05T00:51:44Z"}],"graph_snapshots":[{"event_id":"sha256:819e005446a3d38579fd3800b15bbf7304c6bb8f6b9d109d062066785c474e00","target":"graph","created_at":"2026-07-05T00:51:44Z","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/2003.11280/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have assembled the historical light curves of the BL Lac Object 3FGL J0449.4-4350 at optical and gamma-ray bands, the time spanning about 10 years, analyzed the periodic variability of the light curves by using four different methods (Lomb-Scargle periodogram, REDFIT38, Jurkevich and DACF). We detected a marginally possible quasi-periodic oscillation (QPO) of ~450 days. Assuming it originates from the helical motion jet in a supermassive binary black hole (SMBBH) system undergoing major merger, we estimate the primary black hole mass M~7.7*10^{9} M_sun. To explore the origin of the gamma-ra","authors_text":"Haiming Zhang, Huaizhen Li, Li Ma, Lisheng Mao, Tingfeng Yi, Xing Yang, Yan Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-03-25T08:55:01Z","title":"The gamma-ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4-4350"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.11280","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":"sha256:7bc79e2431172ab1078d4a536b65f911c9a8942c4708d88404fa142ea19983de","target":"record","created_at":"2026-07-05T00:51:44Z","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":"f50cf1dfc53918420d732fc88bffc3cc5a474f92d01e017fc54ead798744cb73","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-03-25T08:55:01Z","title_canon_sha256":"1bfa8d46c1abcdf663184b21edf56db51e768507a0ac1d8adbb3f050c1b82e10"},"schema_version":"1.0","source":{"id":"2003.11280","kind":"arxiv","version":1}},"canonical_sha256":"f8de4cda77e479e45ec9f70d1c9a3e08f28139c25b69960c2dd943cc7daf029f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f8de4cda77e479e45ec9f70d1c9a3e08f28139c25b69960c2dd943cc7daf029f","first_computed_at":"2026-07-05T00:51:44.212643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:51:44.212643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4pj/pOO0NWu47mFxeVmy79YwTTmTrS03IsTOoVrOWi38Z5HW+ZzpyhQuJq9M5WCiDqbuNw3FpTlwnBxl5u/VBA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:51:44.213004Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.11280","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bc79e2431172ab1078d4a536b65f911c9a8942c4708d88404fa142ea19983de","sha256:819e005446a3d38579fd3800b15bbf7304c6bb8f6b9d109d062066785c474e00"],"state_sha256":"8fec2cbd86f5465e002251b2dee0b6466a4e8d87410d8392bd6e67591dcfb631"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yLqJz155c96f7sdB09oWkiJz2PdrkMHLd2kmAM6bW1wJkmCbfCtBk4cskxl6LDhPpoKqMW7riRYhEPYDitg0CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T09:03:56.202691Z","bundle_sha256":"aa02674d80be82033c0497f2f1999eed77e0098e4d765207bf95090e7b9bfb0a"}}