{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:K2RU7SMFV7KE6BYA3TLOHWPWBZ","short_pith_number":"pith:K2RU7SMF","canonical_record":{"source":{"id":"1510.08796","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-10-29T17:46:52Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"a2bf350f0c48c281879b1e9dd814ca88f4a24bb7db7ebc58243fdf28e83d2282","abstract_canon_sha256":"bf8e2f215d490c3d1b696afece2b69d34e6ea90e328926169b0da490c1bb89b3"},"schema_version":"1.0"},"canonical_sha256":"56a34fc985afd44f0700dcd6e3d9f60e688fe80cac7835cdb1ac2cb21cedbc9d","source":{"kind":"arxiv","id":"1510.08796","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.08796","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"arxiv_version","alias_value":"1510.08796v2","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.08796","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"pith_short_12","alias_value":"K2RU7SMFV7KE","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"K2RU7SMFV7KE6BYA","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"K2RU7SMF","created_at":"2026-05-18T12:29:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:K2RU7SMFV7KE6BYA3TLOHWPWBZ","target":"record","payload":{"canonical_record":{"source":{"id":"1510.08796","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-10-29T17:46:52Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"a2bf350f0c48c281879b1e9dd814ca88f4a24bb7db7ebc58243fdf28e83d2282","abstract_canon_sha256":"bf8e2f215d490c3d1b696afece2b69d34e6ea90e328926169b0da490c1bb89b3"},"schema_version":"1.0"},"canonical_sha256":"56a34fc985afd44f0700dcd6e3d9f60e688fe80cac7835cdb1ac2cb21cedbc9d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:18.267563Z","signature_b64":"QNjIe0naq0CIVgEildKU/3wH6qYZnlFSlPlfcfWWyHXmgeetZ8W6wKKtPwSH3ooOa64RtSXDVj/ZqV84Pkc2Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"56a34fc985afd44f0700dcd6e3d9f60e688fe80cac7835cdb1ac2cb21cedbc9d","last_reissued_at":"2026-05-18T01:22:18.266823Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:18.266823Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.08796","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":"2026-05-18T01:22:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rf3ElIuzjw00kJj8LbsQZNJUCqOhQq3SRxtrARbFFmIbCZJxcv9jniml9RaK/hC9/HbTSb6wzh8dDUA3zO5ABA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T02:49:25.264751Z"},"content_sha256":"6f01f4dd3637f43ac8f362f070b6e1f1f34ffa00a99022d9cede9d29da2fac0b","schema_version":"1.0","event_id":"sha256:6f01f4dd3637f43ac8f362f070b6e1f1f34ffa00a99022d9cede9d29da2fac0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:K2RU7SMFV7KE6BYA3TLOHWPWBZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Maximum Likelihood Foreground Cleaning for Cosmic Microwave Background Polarimeters in the Presence of Systematic Effects","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Andrew Jaffe, Ben Gold, Carlo Baccigalupi, Chaoyun Bao, Radek Stompor, Shaul Hanany","submitted_at":"2015-10-29T17:46:52Z","abstract_excerpt":"We extend a general maximum likelihood foreground estimation for cosmic microwave background polarization data to include estimation of instrumental systematic effects. We focus on two particular effects: frequency band measurement uncertainty, and instrumentally induced frequency dependent polarization rotation. We assess the bias induced on the estimation of the $B$-mode polarization signal by these two systematic effects in the presence of instrumental noise and uncertainties in the polarization and spectral index of Galactic dust. Degeneracies between uncertainties in the band and polariza"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.08796","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":""},"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":"2026-05-18T01:22:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hcGxooW08vBeDb78/f7tmDx6GcTMjjfu6UX6AHwxMgg4TwHEpbpKKYc9Yj0QNMs2D3aD/FOj0u5XJkSQE+GNCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T02:49:25.265147Z"},"content_sha256":"8a3d113090067e2835e9a6ed6573168f4ad2a321abb1acce936bb9319dc6ae54","schema_version":"1.0","event_id":"sha256:8a3d113090067e2835e9a6ed6573168f4ad2a321abb1acce936bb9319dc6ae54"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/bundle.json","state_url":"https://pith.science/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/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":"2026-05-27T02:49:25Z","links":{"resolver":"https://pith.science/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ","bundle":"https://pith.science/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/bundle.json","state":"https://pith.science/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/K2RU7SMFV7KE6BYA3TLOHWPWBZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:K2RU7SMFV7KE6BYA3TLOHWPWBZ","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":"bf8e2f215d490c3d1b696afece2b69d34e6ea90e328926169b0da490c1bb89b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-10-29T17:46:52Z","title_canon_sha256":"a2bf350f0c48c281879b1e9dd814ca88f4a24bb7db7ebc58243fdf28e83d2282"},"schema_version":"1.0","source":{"id":"1510.08796","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.08796","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"arxiv_version","alias_value":"1510.08796v2","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.08796","created_at":"2026-05-18T01:22:18Z"},{"alias_kind":"pith_short_12","alias_value":"K2RU7SMFV7KE","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"K2RU7SMFV7KE6BYA","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"K2RU7SMF","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:8a3d113090067e2835e9a6ed6573168f4ad2a321abb1acce936bb9319dc6ae54","target":"graph","created_at":"2026-05-18T01:22:18Z","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":"We extend a general maximum likelihood foreground estimation for cosmic microwave background polarization data to include estimation of instrumental systematic effects. We focus on two particular effects: frequency band measurement uncertainty, and instrumentally induced frequency dependent polarization rotation. We assess the bias induced on the estimation of the $B$-mode polarization signal by these two systematic effects in the presence of instrumental noise and uncertainties in the polarization and spectral index of Galactic dust. Degeneracies between uncertainties in the band and polariza","authors_text":"Andrew Jaffe, Ben Gold, Carlo Baccigalupi, Chaoyun Bao, Radek Stompor, Shaul Hanany","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-10-29T17:46:52Z","title":"Maximum Likelihood Foreground Cleaning for Cosmic Microwave Background Polarimeters in the Presence of Systematic Effects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.08796","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":"sha256:6f01f4dd3637f43ac8f362f070b6e1f1f34ffa00a99022d9cede9d29da2fac0b","target":"record","created_at":"2026-05-18T01:22:18Z","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":"bf8e2f215d490c3d1b696afece2b69d34e6ea90e328926169b0da490c1bb89b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-10-29T17:46:52Z","title_canon_sha256":"a2bf350f0c48c281879b1e9dd814ca88f4a24bb7db7ebc58243fdf28e83d2282"},"schema_version":"1.0","source":{"id":"1510.08796","kind":"arxiv","version":2}},"canonical_sha256":"56a34fc985afd44f0700dcd6e3d9f60e688fe80cac7835cdb1ac2cb21cedbc9d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"56a34fc985afd44f0700dcd6e3d9f60e688fe80cac7835cdb1ac2cb21cedbc9d","first_computed_at":"2026-05-18T01:22:18.266823Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:18.266823Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QNjIe0naq0CIVgEildKU/3wH6qYZnlFSlPlfcfWWyHXmgeetZ8W6wKKtPwSH3ooOa64RtSXDVj/ZqV84Pkc2Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:18.267563Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.08796","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6f01f4dd3637f43ac8f362f070b6e1f1f34ffa00a99022d9cede9d29da2fac0b","sha256:8a3d113090067e2835e9a6ed6573168f4ad2a321abb1acce936bb9319dc6ae54"],"state_sha256":"dbc04d813199f63871219dbc8a2f7f611246c479242287915f6b6d6bf1bef996"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CkH/YEj4yTkCoG/zse4AeRGqNc9/JycUoihW2H5by3OgTcMz4BVFLJT8aoqtYYaRHw8OvRm8B7qG9OSeqpwFCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T02:49:25.268060Z","bundle_sha256":"436c2919102f35f1fdbed84e3bccb737099b4e9a110ee7a94332921e0fb2960e"}}