{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:CSW7CAZVAAX6335DPM42NAQ27F","short_pith_number":"pith:CSW7CAZV","canonical_record":{"source":{"id":"2310.03242","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-10-05T01:26:10Z","cross_cats_sorted":[],"title_canon_sha256":"f81938768b2c10d8a2ce19d38b8e36cea53d154d8175b7bc0fb6d52ed1c02ed2","abstract_canon_sha256":"543ff7333b86ef4111047cfa44fe3098bc23d4711f830309c838c8502bfe0f59"},"schema_version":"1.0"},"canonical_sha256":"14adf10335002fedefa37b39a6821af944801e0f4fc373afd86ac80110ef7e44","source":{"kind":"arxiv","id":"2310.03242","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.03242","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"arxiv_version","alias_value":"2310.03242v1","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.03242","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_12","alias_value":"CSW7CAZVAAX6","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_16","alias_value":"CSW7CAZVAAX6335D","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_8","alias_value":"CSW7CAZV","created_at":"2026-07-05T06:57:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:CSW7CAZVAAX6335DPM42NAQ27F","target":"record","payload":{"canonical_record":{"source":{"id":"2310.03242","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-10-05T01:26:10Z","cross_cats_sorted":[],"title_canon_sha256":"f81938768b2c10d8a2ce19d38b8e36cea53d154d8175b7bc0fb6d52ed1c02ed2","abstract_canon_sha256":"543ff7333b86ef4111047cfa44fe3098bc23d4711f830309c838c8502bfe0f59"},"schema_version":"1.0"},"canonical_sha256":"14adf10335002fedefa37b39a6821af944801e0f4fc373afd86ac80110ef7e44","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:57:30.583203Z","signature_b64":"nHM2YZ23uakivRhGf8nkOO7U142An8azfUi+z2Y4shLtEMu97M1x05gE5PVGlBFX196fDkCBXltM/pTQQRZCAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14adf10335002fedefa37b39a6821af944801e0f4fc373afd86ac80110ef7e44","last_reissued_at":"2026-07-05T06:57:30.582800Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:57:30.582800Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2310.03242","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":"2026-07-05T06:57:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wgYeS/Uf/i5SrdrRKfkLBinTWN8wUF1PWxQFlgXXst2elO1jH4gBIeBT9qUrnw+0oWOtimOx3ah2cqzbXw6iAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T17:43:24.414524Z"},"content_sha256":"b02a09dc31e61ce9b33eb2c5a71868581d8023a1f2c5b642b4b51dafb3083691","schema_version":"1.0","event_id":"sha256:b02a09dc31e61ce9b33eb2c5a71868581d8023a1f2c5b642b4b51dafb3083691"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:CSW7CAZVAAX6335DPM42NAQ27F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Calibrating VLBI Polarization Data Using GPCAL. I. Frequency-Dependent Calibration","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Do-Young Byun, Jongho Park, Keiichi Asada","submitted_at":"2023-10-05T01:26:10Z","abstract_excerpt":"In this series of papers, we present new methods of frequency- and time-dependent instrumental polarization calibration for Very Long Baseline Interferometry (VLBI). In most existing calibration tools and pipelines, it has been assumed that instrumental polarization is constant over frequency within the instrument bandwidth and over time. The assumption is not always true and may prevent an accurate calibration, which can result in degradation of the quality of linear polarization images. In this paper, we present a method of frequency-dependent instrumental polarization calibration that is im"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.03242","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/2310.03242/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":"2026-07-05T06:57:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RRgA8JgntJZfjj2g88Xm6qxjcr+6LlAszcfl/QXVk513QASrdhrO8+gAU5xRAQobRU3MCRg9Rn/YH/oIrWcSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T17:43:24.415071Z"},"content_sha256":"f587f556b954b5f44b6a8f88f832e819a97c8fa961bba04ba02f550865454196","schema_version":"1.0","event_id":"sha256:f587f556b954b5f44b6a8f88f832e819a97c8fa961bba04ba02f550865454196"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CSW7CAZVAAX6335DPM42NAQ27F/bundle.json","state_url":"https://pith.science/pith/CSW7CAZVAAX6335DPM42NAQ27F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CSW7CAZVAAX6335DPM42NAQ27F/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":"2026-08-02T17:43:24Z","links":{"resolver":"https://pith.science/pith/CSW7CAZVAAX6335DPM42NAQ27F","bundle":"https://pith.science/pith/CSW7CAZVAAX6335DPM42NAQ27F/bundle.json","state":"https://pith.science/pith/CSW7CAZVAAX6335DPM42NAQ27F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CSW7CAZVAAX6335DPM42NAQ27F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:CSW7CAZVAAX6335DPM42NAQ27F","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":"543ff7333b86ef4111047cfa44fe3098bc23d4711f830309c838c8502bfe0f59","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-10-05T01:26:10Z","title_canon_sha256":"f81938768b2c10d8a2ce19d38b8e36cea53d154d8175b7bc0fb6d52ed1c02ed2"},"schema_version":"1.0","source":{"id":"2310.03242","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2310.03242","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"arxiv_version","alias_value":"2310.03242v1","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2310.03242","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_12","alias_value":"CSW7CAZVAAX6","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_16","alias_value":"CSW7CAZVAAX6335D","created_at":"2026-07-05T06:57:30Z"},{"alias_kind":"pith_short_8","alias_value":"CSW7CAZV","created_at":"2026-07-05T06:57:30Z"}],"graph_snapshots":[{"event_id":"sha256:f587f556b954b5f44b6a8f88f832e819a97c8fa961bba04ba02f550865454196","target":"graph","created_at":"2026-07-05T06:57:30Z","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/2310.03242/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this series of papers, we present new methods of frequency- and time-dependent instrumental polarization calibration for Very Long Baseline Interferometry (VLBI). In most existing calibration tools and pipelines, it has been assumed that instrumental polarization is constant over frequency within the instrument bandwidth and over time. The assumption is not always true and may prevent an accurate calibration, which can result in degradation of the quality of linear polarization images. In this paper, we present a method of frequency-dependent instrumental polarization calibration that is im","authors_text":"Do-Young Byun, Jongho Park, Keiichi Asada","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-10-05T01:26:10Z","title":"Calibrating VLBI Polarization Data Using GPCAL. I. Frequency-Dependent Calibration"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.03242","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:b02a09dc31e61ce9b33eb2c5a71868581d8023a1f2c5b642b4b51dafb3083691","target":"record","created_at":"2026-07-05T06:57:30Z","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":"543ff7333b86ef4111047cfa44fe3098bc23d4711f830309c838c8502bfe0f59","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2023-10-05T01:26:10Z","title_canon_sha256":"f81938768b2c10d8a2ce19d38b8e36cea53d154d8175b7bc0fb6d52ed1c02ed2"},"schema_version":"1.0","source":{"id":"2310.03242","kind":"arxiv","version":1}},"canonical_sha256":"14adf10335002fedefa37b39a6821af944801e0f4fc373afd86ac80110ef7e44","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14adf10335002fedefa37b39a6821af944801e0f4fc373afd86ac80110ef7e44","first_computed_at":"2026-07-05T06:57:30.582800Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:57:30.582800Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nHM2YZ23uakivRhGf8nkOO7U142An8azfUi+z2Y4shLtEMu97M1x05gE5PVGlBFX196fDkCBXltM/pTQQRZCAg==","signature_status":"signed_v1","signed_at":"2026-07-05T06:57:30.583203Z","signed_message":"canonical_sha256_bytes"},"source_id":"2310.03242","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b02a09dc31e61ce9b33eb2c5a71868581d8023a1f2c5b642b4b51dafb3083691","sha256:f587f556b954b5f44b6a8f88f832e819a97c8fa961bba04ba02f550865454196"],"state_sha256":"deeec899b30e8ba34c8b34c232b06e7170d1684e191d16e6bcb96d946aa28023"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5cEQGSmWdS0yDQKXFTchzeu99jzSGA6WEtBUqxAEJ25SCeHjoPU2eR7iZlPENvVnemrUWoxtDW/iQBoZNoQuCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T17:43:24.418628Z","bundle_sha256":"bc9ddbd5981b011f06636206278df7cd88df1e70d92ad652e116b2743718c489"}}