{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:KTDTDO7OVTQOMGNEGOUFUIYDO3","short_pith_number":"pith:KTDTDO7O","canonical_record":{"source":{"id":"2406.13463","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-06-19T11:40:08Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"f124e73a1f49d497263b89ba32bc5f326689bff3c57f39a11791d2fb52796e99","abstract_canon_sha256":"87c520c9f4c34283e341bda46b147d8732b0d17d448ac9fed9b0d7a84f1c3d78"},"schema_version":"1.0"},"canonical_sha256":"54c731bbeeace0e619a433a85a230376d61000854d37ad376fe99004049d11f6","source":{"kind":"arxiv","id":"2406.13463","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.13463","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"arxiv_version","alias_value":"2406.13463v2","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.13463","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_12","alias_value":"KTDTDO7OVTQO","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_16","alias_value":"KTDTDO7OVTQOMGNE","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_8","alias_value":"KTDTDO7O","created_at":"2026-07-05T09:47:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:KTDTDO7OVTQOMGNEGOUFUIYDO3","target":"record","payload":{"canonical_record":{"source":{"id":"2406.13463","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-06-19T11:40:08Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"f124e73a1f49d497263b89ba32bc5f326689bff3c57f39a11791d2fb52796e99","abstract_canon_sha256":"87c520c9f4c34283e341bda46b147d8732b0d17d448ac9fed9b0d7a84f1c3d78"},"schema_version":"1.0"},"canonical_sha256":"54c731bbeeace0e619a433a85a230376d61000854d37ad376fe99004049d11f6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:47:31.258758Z","signature_b64":"OXPk/cWcBE2SyerTzkR8YepIIlkmLJt8cyn5LGl7ZOpPJtdHIC1LrdYCy5J61vGbtfUVUjBpr4CsNnA4Qj/1Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"54c731bbeeace0e619a433a85a230376d61000854d37ad376fe99004049d11f6","last_reissued_at":"2026-07-05T09:47:31.258159Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:47:31.258159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2406.13463","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":"2026-07-05T09:47:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yyv4eKadVsX2TYDiZm+dH2+ZxeZT89aGpzhcTlCcgPhuamLXlFSkAlqgdDpcEkAczsd7kARw+N5tEGq2TafzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T19:47:06.918332Z"},"content_sha256":"b9e387fd8ae725c194b3df18a3689688312e95e9302bb3529b3f60ed20647338","schema_version":"1.0","event_id":"sha256:b9e387fd8ae725c194b3df18a3689688312e95e9302bb3529b3f60ed20647338"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:KTDTDO7OVTQOMGNEGOUFUIYDO3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Exploring pulsar timing precision: A comparative study of polarization calibration methods for NANOGrav data from the Green Bank Telescope","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Cherry Ng, David J. Nice, Deborah C. Good, Duncan R. Lorimer, Elizabeth C. Ferrara, Emmanuel Fonseca, Haley M. Wahl, Harsha Blumer, H. Thankful Cromartie, Ingrid H. Stairs, Jing Luo, Joseph Glaser, Joseph K. Swiggum, Justin A. Ellis, Kevin Stovall, Lankeswar Dey, Maura A. McLaughlin, Megan E. DeCesar, Megan L. Jones, Michael T. Lam, Nate Garver-Daniels, Nihan S. Pol, Paul B. Demorest, Paul R. Brook, Peter A. Gentile, Ren\\'ee Spiewak, Robert D. Ferdman, Ross J. Jennings, Ryan S. Lynch, Sarah Burke-Spolaor, Scott M. Ransom, Timothy Dolch, Timothy T. Pennucci, William Fiore, Zaven Arzoumanian","submitted_at":"2024-06-19T11:40:08Z","abstract_excerpt":"Pulsar timing array experiments have recently uncovered evidence for a nanohertz gravitational wave background by precisely timing an ensemble of millisecond pulsars. The next significant milestones for these experiments include characterizing the detected background with greater precision, identifying its source(s), and detecting continuous gravitational waves from individual supermassive black hole binaries. To achieve these objectives, generating accurate and precise times of arrival of pulses from pulsar observations is crucial. Incorrect polarization calibration of the observed pulsar pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.13463","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/2406.13463/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":"2026-07-05T09:47:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"POcHdywZFDTfQ0/O8UMJIiWDrnp1wZdacxEEKFXSc6hTmlKzUpCw72xda3dzvd2b/jHWcOiIXyC06gk4IUx0DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T19:47:06.918723Z"},"content_sha256":"94edc951292dfa7edf9d191ff69234e9f8ef44c7ec9a36632f06182e8c3b0bca","schema_version":"1.0","event_id":"sha256:94edc951292dfa7edf9d191ff69234e9f8ef44c7ec9a36632f06182e8c3b0bca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/bundle.json","state_url":"https://pith.science/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/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":"2026-07-13T19:47:06Z","links":{"resolver":"https://pith.science/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3","bundle":"https://pith.science/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/bundle.json","state":"https://pith.science/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KTDTDO7OVTQOMGNEGOUFUIYDO3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:KTDTDO7OVTQOMGNEGOUFUIYDO3","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":"87c520c9f4c34283e341bda46b147d8732b0d17d448ac9fed9b0d7a84f1c3d78","cross_cats_sorted":["astro-ph.IM"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-06-19T11:40:08Z","title_canon_sha256":"f124e73a1f49d497263b89ba32bc5f326689bff3c57f39a11791d2fb52796e99"},"schema_version":"1.0","source":{"id":"2406.13463","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.13463","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"arxiv_version","alias_value":"2406.13463v2","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.13463","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_12","alias_value":"KTDTDO7OVTQO","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_16","alias_value":"KTDTDO7OVTQOMGNE","created_at":"2026-07-05T09:47:31Z"},{"alias_kind":"pith_short_8","alias_value":"KTDTDO7O","created_at":"2026-07-05T09:47:31Z"}],"graph_snapshots":[{"event_id":"sha256:94edc951292dfa7edf9d191ff69234e9f8ef44c7ec9a36632f06182e8c3b0bca","target":"graph","created_at":"2026-07-05T09:47:31Z","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/2406.13463/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Pulsar timing array experiments have recently uncovered evidence for a nanohertz gravitational wave background by precisely timing an ensemble of millisecond pulsars. The next significant milestones for these experiments include characterizing the detected background with greater precision, identifying its source(s), and detecting continuous gravitational waves from individual supermassive black hole binaries. To achieve these objectives, generating accurate and precise times of arrival of pulses from pulsar observations is crucial. Incorrect polarization calibration of the observed pulsar pro","authors_text":"Cherry Ng, David J. Nice, Deborah C. Good, Duncan R. Lorimer, Elizabeth C. Ferrara, Emmanuel Fonseca, Haley M. Wahl, Harsha Blumer, H. Thankful Cromartie, Ingrid H. Stairs, Jing Luo, Joseph Glaser, Joseph K. Swiggum, Justin A. Ellis, Kevin Stovall, Lankeswar Dey, Maura A. McLaughlin, Megan E. DeCesar, Megan L. Jones, Michael T. Lam, Nate Garver-Daniels, Nihan S. Pol, Paul B. Demorest, Paul R. Brook, Peter A. Gentile, Ren\\'ee Spiewak, Robert D. Ferdman, Ross J. Jennings, Ryan S. Lynch, Sarah Burke-Spolaor, Scott M. Ransom, Timothy Dolch, Timothy T. Pennucci, William Fiore, Zaven Arzoumanian","cross_cats":["astro-ph.IM"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-06-19T11:40:08Z","title":"Exploring pulsar timing precision: A comparative study of polarization calibration methods for NANOGrav data from the Green Bank Telescope"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.13463","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:b9e387fd8ae725c194b3df18a3689688312e95e9302bb3529b3f60ed20647338","target":"record","created_at":"2026-07-05T09:47:31Z","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":"87c520c9f4c34283e341bda46b147d8732b0d17d448ac9fed9b0d7a84f1c3d78","cross_cats_sorted":["astro-ph.IM"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-06-19T11:40:08Z","title_canon_sha256":"f124e73a1f49d497263b89ba32bc5f326689bff3c57f39a11791d2fb52796e99"},"schema_version":"1.0","source":{"id":"2406.13463","kind":"arxiv","version":2}},"canonical_sha256":"54c731bbeeace0e619a433a85a230376d61000854d37ad376fe99004049d11f6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54c731bbeeace0e619a433a85a230376d61000854d37ad376fe99004049d11f6","first_computed_at":"2026-07-05T09:47:31.258159Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:47:31.258159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OXPk/cWcBE2SyerTzkR8YepIIlkmLJt8cyn5LGl7ZOpPJtdHIC1LrdYCy5J61vGbtfUVUjBpr4CsNnA4Qj/1Dg==","signature_status":"signed_v1","signed_at":"2026-07-05T09:47:31.258758Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.13463","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9e387fd8ae725c194b3df18a3689688312e95e9302bb3529b3f60ed20647338","sha256:94edc951292dfa7edf9d191ff69234e9f8ef44c7ec9a36632f06182e8c3b0bca"],"state_sha256":"84b623d442b827ff2ea0eb865eaef72cd9075285116153039bb85d9d80114bb8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EKNFGZbx/IkP9frdgmS4wST0oD5ShvYW95hQFJZrHmQE/wPf8OQPOVEQE5sy3SXJt9M1N0ac8uhYZ9DdkSQNCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-13T19:47:06.920962Z","bundle_sha256":"9b7d360aa7fcf1d8fca9adf9c6fbd504152337c65ab962dd165f68868599d5dd"}}