{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:7Z4D57HANS3JPJIZWYORRC6B3E","short_pith_number":"pith:7Z4D57HA","canonical_record":{"source":{"id":"2307.11696","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-21T16:50:46Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"74ff52ce6f109ad6246ea6acc19c3719cb0ade61ac3bf0a31ecc4a07707ec6a2","abstract_canon_sha256":"0135027ecaf31f9ef517acc96c17851aada74b2546337518084de3a3dbaea9d9"},"schema_version":"1.0"},"canonical_sha256":"fe783efce06cb697a519b61d188bc1d93cc11d1a4cd7324c60b7a8701147f4da","source":{"kind":"arxiv","id":"2307.11696","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.11696","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"arxiv_version","alias_value":"2307.11696v2","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.11696","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_12","alias_value":"7Z4D57HANS3J","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_16","alias_value":"7Z4D57HANS3JPJIZ","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_8","alias_value":"7Z4D57HA","created_at":"2026-07-05T08:08:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:7Z4D57HANS3JPJIZWYORRC6B3E","target":"record","payload":{"canonical_record":{"source":{"id":"2307.11696","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-21T16:50:46Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"74ff52ce6f109ad6246ea6acc19c3719cb0ade61ac3bf0a31ecc4a07707ec6a2","abstract_canon_sha256":"0135027ecaf31f9ef517acc96c17851aada74b2546337518084de3a3dbaea9d9"},"schema_version":"1.0"},"canonical_sha256":"fe783efce06cb697a519b61d188bc1d93cc11d1a4cd7324c60b7a8701147f4da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:08:17.617999Z","signature_b64":"BPow5HBFEicokjegmNfHeCRG7JGjAZAdOBhbgaZkLtmcuBq1x7gR1PVLCZYgwQdyMI3oxq4EUnYMCn05G6KTAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fe783efce06cb697a519b61d188bc1d93cc11d1a4cd7324c60b7a8701147f4da","last_reissued_at":"2026-07-05T08:08:17.617550Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:08:17.617550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2307.11696","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":"2026-07-05T08:08:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8nEmI8d1XjdvxLyJuQXmqyJGvdYamHKu/qwO3awQI3MeTBG4gKfC87bchDPalfi79n97wtJpEAgQoUJGtzR9BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:18:44.404490Z"},"content_sha256":"26b11882862b3903e9cfdd4287c5179c6171d0e4111eb473b3550bc1dc07e9eb","schema_version":"1.0","event_id":"sha256:26b11882862b3903e9cfdd4287c5179c6171d0e4111eb473b3550bc1dc07e9eb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:7Z4D57HANS3JPJIZWYORRC6B3E","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Alba Rico, Alberto Dominguez, John Ryan Westernacher-Schneider, Jonathan Zrake, Marco Ajello, Pablo Penil, Sagar Adhikari, Sara Buson","submitted_at":"2023-07-21T16:50:46Z","abstract_excerpt":"PG 1553+113 is a well-known blazar exhibiting evidence of a $\\sim\\! 2.2$-yr quasi-periodic oscillation (QPO) in radio, optical, X-ray, and $\\gamma$-ray bands. Since QPO mechanisms often predict multiple QPOs, we search for a second QPO in its historical optical light curve covering a century of observations. Despite challenging data quality issues, we find hints of a $21.8 \\pm 4.7$ yr oscillation. On its own, this $\\sim\\! 22$-yr period has a modest statistical significance of $1.6\\sigma$ when accounting for the look-elsewhere effect. However, the joint significance of both the $2.2$- and $22$-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.11696","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2307.11696/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":"2026-07-05T08:08:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hrRF7/XD+xWIQ5YnqcRArlQ5IQ1EdT8Qz0fFcQH4Mi7s863qWSzu1luWBsziji8/UJG09mqneqR0EK1W7AizDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T20:18:44.405457Z"},"content_sha256":"9959472e8218e41c92d30c95d70f40f26a9d51a67af86ff17043f5c37b56184c","schema_version":"1.0","event_id":"sha256:9959472e8218e41c92d30c95d70f40f26a9d51a67af86ff17043f5c37b56184c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7Z4D57HANS3JPJIZWYORRC6B3E/bundle.json","state_url":"https://pith.science/pith/7Z4D57HANS3JPJIZWYORRC6B3E/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7Z4D57HANS3JPJIZWYORRC6B3E/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":"2026-08-03T20:18:44Z","links":{"resolver":"https://pith.science/pith/7Z4D57HANS3JPJIZWYORRC6B3E","bundle":"https://pith.science/pith/7Z4D57HANS3JPJIZWYORRC6B3E/bundle.json","state":"https://pith.science/pith/7Z4D57HANS3JPJIZWYORRC6B3E/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7Z4D57HANS3JPJIZWYORRC6B3E/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:7Z4D57HANS3JPJIZWYORRC6B3E","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":"0135027ecaf31f9ef517acc96c17851aada74b2546337518084de3a3dbaea9d9","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-21T16:50:46Z","title_canon_sha256":"74ff52ce6f109ad6246ea6acc19c3719cb0ade61ac3bf0a31ecc4a07707ec6a2"},"schema_version":"1.0","source":{"id":"2307.11696","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2307.11696","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"arxiv_version","alias_value":"2307.11696v2","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2307.11696","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_12","alias_value":"7Z4D57HANS3J","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_16","alias_value":"7Z4D57HANS3JPJIZ","created_at":"2026-07-05T08:08:17Z"},{"alias_kind":"pith_short_8","alias_value":"7Z4D57HA","created_at":"2026-07-05T08:08:17Z"}],"graph_snapshots":[{"event_id":"sha256:9959472e8218e41c92d30c95d70f40f26a9d51a67af86ff17043f5c37b56184c","target":"graph","created_at":"2026-07-05T08:08:17Z","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/2307.11696/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"PG 1553+113 is a well-known blazar exhibiting evidence of a $\\sim\\! 2.2$-yr quasi-periodic oscillation (QPO) in radio, optical, X-ray, and $\\gamma$-ray bands. Since QPO mechanisms often predict multiple QPOs, we search for a second QPO in its historical optical light curve covering a century of observations. Despite challenging data quality issues, we find hints of a $21.8 \\pm 4.7$ yr oscillation. On its own, this $\\sim\\! 22$-yr period has a modest statistical significance of $1.6\\sigma$ when accounting for the look-elsewhere effect. However, the joint significance of both the $2.2$- and $22$-","authors_text":"Alba Rico, Alberto Dominguez, John Ryan Westernacher-Schneider, Jonathan Zrake, Marco Ajello, Pablo Penil, Sagar Adhikari, Sara Buson","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-21T16:50:46Z","title":"Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.11696","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":"sha256:26b11882862b3903e9cfdd4287c5179c6171d0e4111eb473b3550bc1dc07e9eb","target":"record","created_at":"2026-07-05T08:08:17Z","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":"0135027ecaf31f9ef517acc96c17851aada74b2546337518084de3a3dbaea9d9","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-07-21T16:50:46Z","title_canon_sha256":"74ff52ce6f109ad6246ea6acc19c3719cb0ade61ac3bf0a31ecc4a07707ec6a2"},"schema_version":"1.0","source":{"id":"2307.11696","kind":"arxiv","version":2}},"canonical_sha256":"fe783efce06cb697a519b61d188bc1d93cc11d1a4cd7324c60b7a8701147f4da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe783efce06cb697a519b61d188bc1d93cc11d1a4cd7324c60b7a8701147f4da","first_computed_at":"2026-07-05T08:08:17.617550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:08:17.617550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BPow5HBFEicokjegmNfHeCRG7JGjAZAdOBhbgaZkLtmcuBq1x7gR1PVLCZYgwQdyMI3oxq4EUnYMCn05G6KTAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:08:17.617999Z","signed_message":"canonical_sha256_bytes"},"source_id":"2307.11696","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:26b11882862b3903e9cfdd4287c5179c6171d0e4111eb473b3550bc1dc07e9eb","sha256:9959472e8218e41c92d30c95d70f40f26a9d51a67af86ff17043f5c37b56184c"],"state_sha256":"9153afef733de595a6514bcd91c8e7e2bcf454767e34cebfff65b6dd28c9f297"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NbugqVyfNP/QL2T6N7h2LrsO/deucvkJI9R7WH2vA0I0zYZ8aUod+M/YSy76qOMq/iOXy1KshF1DKjNr2AtBAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T20:18:44.412198Z","bundle_sha256":"a2123ef7661dcca13c02fdbfd097d508ad1aac5ed7afa063fda6b3030d084517"}}