{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:HXN3Z7QA77POTLGMFDQVL7SBVT","short_pith_number":"pith:HXN3Z7QA","canonical_record":{"source":{"id":"1307.5040","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-07-18T18:43:49Z","cross_cats_sorted":["math.OC","stat.AP"],"title_canon_sha256":"ae52ddfd4268554a178028286ce8669bdeb8d3459046e366a80218cb61217b72","abstract_canon_sha256":"ca3a88ce02df7d2067a5fe93bcb912bc8341213c1291f00ff672035ba837b6ab"},"schema_version":"1.0"},"canonical_sha256":"3ddbbcfe00ffdee9accc28e155fe41ace40a17f2bfa66b69ea2ddac05af49562","source":{"kind":"arxiv","id":"1307.5040","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.5040","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"arxiv_version","alias_value":"1307.5040v1","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.5040","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"pith_short_12","alias_value":"HXN3Z7QA77PO","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HXN3Z7QA77POTLGM","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HXN3Z7QA","created_at":"2026-05-18T12:27:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:HXN3Z7QA77POTLGMFDQVL7SBVT","target":"record","payload":{"canonical_record":{"source":{"id":"1307.5040","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-07-18T18:43:49Z","cross_cats_sorted":["math.OC","stat.AP"],"title_canon_sha256":"ae52ddfd4268554a178028286ce8669bdeb8d3459046e366a80218cb61217b72","abstract_canon_sha256":"ca3a88ce02df7d2067a5fe93bcb912bc8341213c1291f00ff672035ba837b6ab"},"schema_version":"1.0"},"canonical_sha256":"3ddbbcfe00ffdee9accc28e155fe41ace40a17f2bfa66b69ea2ddac05af49562","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:42.837705Z","signature_b64":"CLgdAX8aA6yCQSIIjd9aXg3Lhd35Ep6giGNkyiO8/TjYk+6VOr0DJxChFXL3yW/N+UdFcazvWU9RVspe2WrLAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ddbbcfe00ffdee9accc28e155fe41ace40a17f2bfa66b69ea2ddac05af49562","last_reissued_at":"2026-05-18T01:48:42.836721Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:42.836721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.5040","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":"2026-05-18T01:48:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sYHUUwJ0obdvdBUi+DAXRXQWCh0ThtaTdt0umEk4vsm4V0VOqV4+uQemPbQxDPSDbT9BMANcnsWscj5kxInIAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T17:06:23.899556Z"},"content_sha256":"838b9b24bb0f24bb3c5bf8b0595030ebcd5661d4e2fcc48331b4506bee8f7f65","schema_version":"1.0","event_id":"sha256:838b9b24bb0f24bb3c5bf8b0595030ebcd5661d4e2fcc48331b4506bee8f7f65"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:HXN3Z7QA77POTLGMFDQVL7SBVT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Robust Radio Interferometric Calibration Using the t-Distribution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.OC","stat.AP"],"primary_cat":"astro-ph.IM","authors_text":"S. Kazemi, S. Yatawatta","submitted_at":"2013-07-18T18:43:49Z","abstract_excerpt":"A major stage of radio interferometric data processing is calibration or the estimation of systematic errors in the data and the correction for such errors. A stochastic error (noise) model is assumed, and in most cases, this underlying model is assumed to be Gaussian. However, outliers in the data due to interference or due to errors in the sky model would have adverse effects on processing based on a Gaussian noise model. Most of the shortcomings of calibration such as the loss in flux or coherence, and the appearance of spurious sources, could be attributed to the deviations of the underlyi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5040","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":""},"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":"2026-05-18T01:48:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O7mSKfTcoiBSs4yJyCKkNjK55xuh8H/FWabyoAzTEtk4R/JJ3D+ATNYrG5OecajZYZ6B5NQJr14/O1ktTiEmCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T17:06:23.900248Z"},"content_sha256":"a3d4224a54133d548a89e34e3712bfcd890820f946691cb9cba19910c2bcef87","schema_version":"1.0","event_id":"sha256:a3d4224a54133d548a89e34e3712bfcd890820f946691cb9cba19910c2bcef87"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/bundle.json","state_url":"https://pith.science/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/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":"2026-05-26T17:06:23Z","links":{"resolver":"https://pith.science/pith/HXN3Z7QA77POTLGMFDQVL7SBVT","bundle":"https://pith.science/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/bundle.json","state":"https://pith.science/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HXN3Z7QA77POTLGMFDQVL7SBVT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:HXN3Z7QA77POTLGMFDQVL7SBVT","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":"ca3a88ce02df7d2067a5fe93bcb912bc8341213c1291f00ff672035ba837b6ab","cross_cats_sorted":["math.OC","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-07-18T18:43:49Z","title_canon_sha256":"ae52ddfd4268554a178028286ce8669bdeb8d3459046e366a80218cb61217b72"},"schema_version":"1.0","source":{"id":"1307.5040","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.5040","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"arxiv_version","alias_value":"1307.5040v1","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.5040","created_at":"2026-05-18T01:48:42Z"},{"alias_kind":"pith_short_12","alias_value":"HXN3Z7QA77PO","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"HXN3Z7QA77POTLGM","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"HXN3Z7QA","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:a3d4224a54133d548a89e34e3712bfcd890820f946691cb9cba19910c2bcef87","target":"graph","created_at":"2026-05-18T01:48:42Z","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":"A major stage of radio interferometric data processing is calibration or the estimation of systematic errors in the data and the correction for such errors. A stochastic error (noise) model is assumed, and in most cases, this underlying model is assumed to be Gaussian. However, outliers in the data due to interference or due to errors in the sky model would have adverse effects on processing based on a Gaussian noise model. Most of the shortcomings of calibration such as the loss in flux or coherence, and the appearance of spurious sources, could be attributed to the deviations of the underlyi","authors_text":"S. Kazemi, S. Yatawatta","cross_cats":["math.OC","stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-07-18T18:43:49Z","title":"Robust Radio Interferometric Calibration Using the t-Distribution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5040","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":"sha256:838b9b24bb0f24bb3c5bf8b0595030ebcd5661d4e2fcc48331b4506bee8f7f65","target":"record","created_at":"2026-05-18T01:48:42Z","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":"ca3a88ce02df7d2067a5fe93bcb912bc8341213c1291f00ff672035ba837b6ab","cross_cats_sorted":["math.OC","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-07-18T18:43:49Z","title_canon_sha256":"ae52ddfd4268554a178028286ce8669bdeb8d3459046e366a80218cb61217b72"},"schema_version":"1.0","source":{"id":"1307.5040","kind":"arxiv","version":1}},"canonical_sha256":"3ddbbcfe00ffdee9accc28e155fe41ace40a17f2bfa66b69ea2ddac05af49562","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ddbbcfe00ffdee9accc28e155fe41ace40a17f2bfa66b69ea2ddac05af49562","first_computed_at":"2026-05-18T01:48:42.836721Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:42.836721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CLgdAX8aA6yCQSIIjd9aXg3Lhd35Ep6giGNkyiO8/TjYk+6VOr0DJxChFXL3yW/N+UdFcazvWU9RVspe2WrLAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:42.837705Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.5040","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:838b9b24bb0f24bb3c5bf8b0595030ebcd5661d4e2fcc48331b4506bee8f7f65","sha256:a3d4224a54133d548a89e34e3712bfcd890820f946691cb9cba19910c2bcef87"],"state_sha256":"63411de70af99fba8edaf66306da6cf6d3b40201708da155907de438f920d3fc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9yO/kXuH7CgRWce/lU8I1OW2o04DdWLgWRLBtgfUyE9G1/PpuPYVCgmCod5JsfrIBfwZew1UkZChjCRzjy+lBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T17:06:23.903052Z","bundle_sha256":"17b6a08390872283e0bfb3e525a60236631be6f75f9949d1c942f840576a3d2a"}}