{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:5ISHKNZIFQOR5ZON5G5ANUVFJ6","short_pith_number":"pith:5ISHKNZI","canonical_record":{"source":{"id":"1005.4371","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-05-24T16:29:31Z","cross_cats_sorted":[],"title_canon_sha256":"f062db3163d8a562ab080dc21fd7132379247e4af1d86bff2a2bc1ca72f4e030","abstract_canon_sha256":"0550c864975eacdef4cb0c1e5d22ee8fb423243c547124e1b69965b823ce6647"},"schema_version":"1.0"},"canonical_sha256":"ea247537282c1d1ee5cde9ba06d2a54f9695e7650dc39a4722f1e0d0c56a7766","source":{"kind":"arxiv","id":"1005.4371","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.4371","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"arxiv_version","alias_value":"1005.4371v1","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.4371","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"pith_short_12","alias_value":"5ISHKNZIFQOR","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"5ISHKNZIFQOR5ZON","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"5ISHKNZI","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:5ISHKNZIFQOR5ZON5G5ANUVFJ6","target":"record","payload":{"canonical_record":{"source":{"id":"1005.4371","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-05-24T16:29:31Z","cross_cats_sorted":[],"title_canon_sha256":"f062db3163d8a562ab080dc21fd7132379247e4af1d86bff2a2bc1ca72f4e030","abstract_canon_sha256":"0550c864975eacdef4cb0c1e5d22ee8fb423243c547124e1b69965b823ce6647"},"schema_version":"1.0"},"canonical_sha256":"ea247537282c1d1ee5cde9ba06d2a54f9695e7650dc39a4722f1e0d0c56a7766","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:07:15.122753Z","signature_b64":"vDCQocNodGaRs8LgWncjzMZ/C6NBMFxRSM7xYMH2DlVkgmYHaE3QmCvNk9Gn5XXa2s9k+6+92wxtj1dX0Eu+DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ea247537282c1d1ee5cde9ba06d2a54f9695e7650dc39a4722f1e0d0c56a7766","last_reissued_at":"2026-05-18T02:07:15.121971Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:07:15.121971Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1005.4371","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":"2026-05-18T02:07:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2w4U/mCqGIAGUdKKj+C7dQzvekeBFhkHoED/lMrSoQ1sX4Vo/D8w0spSVoFGct7nVdzOBIS/c6wuNmHhbyWUBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T08:16:54.085068Z"},"content_sha256":"b5e2b73e61a57bc16cb2ae6b56a13a6fa4f9f7ed5dd09f2fc130f03f4e5cc174","schema_version":"1.0","event_id":"sha256:b5e2b73e61a57bc16cb2ae6b56a13a6fa4f9f7ed5dd09f2fc130f03f4e5cc174"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:5ISHKNZIFQOR5ZON5G5ANUVFJ6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Generalized Spectral Kurtosis Estimator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Dale E. Gary, Gelu M. Nita","submitted_at":"2010-05-24T16:29:31Z","abstract_excerpt":"Due to its conceptual simplicity and its proven effectiveness in real-time detection and removal of radio frequency interference (RFI) from radio astronomy data, the Spectral Kurtosis (SK) estimator is likely to become a standard tool of a new generation of radio telescopes. However, the SK estimator in its original form must be developed from instantaneous power spectral density (PSD) estimates, and hence cannot be employed as an RFI excision tool downstream of the data pipeline in existing instruments where any time averaging is performed. In this letter, we develop a generalized estimator w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.4371","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":"2026-05-18T02:07:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FViGPYlKpZT3/0uOXWKlXdXf51IuE1f4qVrUGSSTfE5KyUnwCzvP+l3m7dtE6VUAWNaDlBgypxzaHZxWaDYUDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T08:16:54.085429Z"},"content_sha256":"232ac4fb5bf88806a6ae47b179b321b677d22a74b2c81824fdf9c83f919fd324","schema_version":"1.0","event_id":"sha256:232ac4fb5bf88806a6ae47b179b321b677d22a74b2c81824fdf9c83f919fd324"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/bundle.json","state_url":"https://pith.science/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/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":"2026-06-30T08:16:54Z","links":{"resolver":"https://pith.science/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6","bundle":"https://pith.science/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/bundle.json","state":"https://pith.science/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5ISHKNZIFQOR5ZON5G5ANUVFJ6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:5ISHKNZIFQOR5ZON5G5ANUVFJ6","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":"0550c864975eacdef4cb0c1e5d22ee8fb423243c547124e1b69965b823ce6647","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-05-24T16:29:31Z","title_canon_sha256":"f062db3163d8a562ab080dc21fd7132379247e4af1d86bff2a2bc1ca72f4e030"},"schema_version":"1.0","source":{"id":"1005.4371","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1005.4371","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"arxiv_version","alias_value":"1005.4371v1","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1005.4371","created_at":"2026-05-18T02:07:15Z"},{"alias_kind":"pith_short_12","alias_value":"5ISHKNZIFQOR","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"5ISHKNZIFQOR5ZON","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"5ISHKNZI","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:232ac4fb5bf88806a6ae47b179b321b677d22a74b2c81824fdf9c83f919fd324","target":"graph","created_at":"2026-05-18T02:07:15Z","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":"Due to its conceptual simplicity and its proven effectiveness in real-time detection and removal of radio frequency interference (RFI) from radio astronomy data, the Spectral Kurtosis (SK) estimator is likely to become a standard tool of a new generation of radio telescopes. However, the SK estimator in its original form must be developed from instantaneous power spectral density (PSD) estimates, and hence cannot be employed as an RFI excision tool downstream of the data pipeline in existing instruments where any time averaging is performed. In this letter, we develop a generalized estimator w","authors_text":"Dale E. Gary, Gelu M. Nita","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-05-24T16:29:31Z","title":"The Generalized Spectral Kurtosis Estimator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1005.4371","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:b5e2b73e61a57bc16cb2ae6b56a13a6fa4f9f7ed5dd09f2fc130f03f4e5cc174","target":"record","created_at":"2026-05-18T02:07:15Z","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":"0550c864975eacdef4cb0c1e5d22ee8fb423243c547124e1b69965b823ce6647","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2010-05-24T16:29:31Z","title_canon_sha256":"f062db3163d8a562ab080dc21fd7132379247e4af1d86bff2a2bc1ca72f4e030"},"schema_version":"1.0","source":{"id":"1005.4371","kind":"arxiv","version":1}},"canonical_sha256":"ea247537282c1d1ee5cde9ba06d2a54f9695e7650dc39a4722f1e0d0c56a7766","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ea247537282c1d1ee5cde9ba06d2a54f9695e7650dc39a4722f1e0d0c56a7766","first_computed_at":"2026-05-18T02:07:15.121971Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:07:15.121971Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vDCQocNodGaRs8LgWncjzMZ/C6NBMFxRSM7xYMH2DlVkgmYHaE3QmCvNk9Gn5XXa2s9k+6+92wxtj1dX0Eu+DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:07:15.122753Z","signed_message":"canonical_sha256_bytes"},"source_id":"1005.4371","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5e2b73e61a57bc16cb2ae6b56a13a6fa4f9f7ed5dd09f2fc130f03f4e5cc174","sha256:232ac4fb5bf88806a6ae47b179b321b677d22a74b2c81824fdf9c83f919fd324"],"state_sha256":"5ea906f4ab8d4ecee9f801711ac069b6b90e555c71e0d8facaf9ee1d3cb99b19"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3tMqPe3AyTa/K+IZrHlEe8BG25n6WmBP2QDiItUnN6kxwrXiRH8EtWD2Wzd5AnCyaA190pbf+egybnTFq6V2BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T08:16:54.087434Z","bundle_sha256":"77f5cc1700580a7d0ca51fd81e6218e68cc1d14916771d5c61a52457e62ca47e"}}