{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:GTPR22SD34IGHDXQWOTDZLXHKX","short_pith_number":"pith:GTPR22SD","canonical_record":{"source":{"id":"1607.01825","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-07-06T22:00:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"0d3be546ab1295dea19f290afa87e15dcf7af094a49ac790927bb71ca267263d","abstract_canon_sha256":"ab53453c2412c7c0e8771ba9209dbc48137fd0f685cc24892b570690b2e5046e"},"schema_version":"1.0"},"canonical_sha256":"34df1d6a43df10638ef0b3a63caee755ed5530ae23e73e114c9143ef4ecc7b9d","source":{"kind":"arxiv","id":"1607.01825","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.01825","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"arxiv_version","alias_value":"1607.01825v2","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.01825","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"pith_short_12","alias_value":"GTPR22SD34IG","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GTPR22SD34IGHDXQ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GTPR22SD","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:GTPR22SD34IGHDXQWOTDZLXHKX","target":"record","payload":{"canonical_record":{"source":{"id":"1607.01825","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-07-06T22:00:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"0d3be546ab1295dea19f290afa87e15dcf7af094a49ac790927bb71ca267263d","abstract_canon_sha256":"ab53453c2412c7c0e8771ba9209dbc48137fd0f685cc24892b570690b2e5046e"},"schema_version":"1.0"},"canonical_sha256":"34df1d6a43df10638ef0b3a63caee755ed5530ae23e73e114c9143ef4ecc7b9d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:39.352512Z","signature_b64":"vrjEcOavLu+t3buGvLyvSvPrj3IQ5buwC+hweLd3QN1T4DSI3baNcIQrcFqgMPRCfMOMRLw2xuhrCHxQX5toDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34df1d6a43df10638ef0b3a63caee755ed5530ae23e73e114c9143ef4ecc7b9d","last_reissued_at":"2026-05-18T00:52:39.352045Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:39.352045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1607.01825","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":"2026-05-18T00:52:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ruc0Dj/MwQjV//jdaO/QDzAIqPzwPcy+YcRa0UQBpKtPCkcRFAECLiQ0tdKZCdOAUfqkwYAVj7e8zJvVo85RBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:39:48.008736Z"},"content_sha256":"f3382f6fb1de1d3442bc7aa12d2d6075991f50948b6c711c9da1834d69f8d994","schema_version":"1.0","event_id":"sha256:f3382f6fb1de1d3442bc7aa12d2d6075991f50948b6c711c9da1834d69f8d994"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:GTPR22SD34IGHDXQWOTDZLXHKX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical modeling and polarization calibration for CMB measurements with ACTPol and Advanced ACTPol","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Alessandro Schillaci, Benjamin L. Schmitt, Brian Koopman, Dale Li, Edward J. Wollack, Eve M. Vavagiakis, Federico Nati, Hsiao-mei Cho, Jason Austermann, Jeff McMahon, Johannes Hubmayr, Jonathan T. Ward, Kent D. Irwin, Kevin P. Coughlin, Laura Newburgh, Lyman A. Page, Maria Salatino, Matthew Hasselfield, Michael D. Niemack, Patricio A. Gallardo, Sara M. Simon, Shannon M. Duff, Shawn W. Henderson, Shuay-Pwu Patty Ho","submitted_at":"2016-07-06T22:00:26Z","abstract_excerpt":"The Atacama Cosmology Telescope Polarimeter (ACTPol) is a polarization sensitive upgrade to the Atacama Cosmology Telescope. Located at an elevation of 5190 m, ACTPol measures the Cosmic Microwave Background (CMB) temperature and polarization with arcminute-scale angular resolution. Calibration of the detector angles is a critical step in producing maps of the CMB polarization. Polarization angle offsets in the detector calibration can cause leakage in polarization from E to B modes and induce a spurious signal in the EB and TB cross correlations, which eliminates our ability to measure potent"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.01825","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":"2026-05-18T00:52:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XEOq3amw7/O98YUQKHUJO2W7ioqv4f0HshENIr1AdpCG/qHImuShgqu3g2SZEt1mrDFu1s0vvc4r6T38Fiw/DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T19:39:48.009124Z"},"content_sha256":"1a9f036189ac72658dbc6700cebfc473f07b73094aa36b9bb2bc528914102936","schema_version":"1.0","event_id":"sha256:1a9f036189ac72658dbc6700cebfc473f07b73094aa36b9bb2bc528914102936"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GTPR22SD34IGHDXQWOTDZLXHKX/bundle.json","state_url":"https://pith.science/pith/GTPR22SD34IGHDXQWOTDZLXHKX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GTPR22SD34IGHDXQWOTDZLXHKX/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":"2026-05-25T19:39:48Z","links":{"resolver":"https://pith.science/pith/GTPR22SD34IGHDXQWOTDZLXHKX","bundle":"https://pith.science/pith/GTPR22SD34IGHDXQWOTDZLXHKX/bundle.json","state":"https://pith.science/pith/GTPR22SD34IGHDXQWOTDZLXHKX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GTPR22SD34IGHDXQWOTDZLXHKX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:GTPR22SD34IGHDXQWOTDZLXHKX","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":"ab53453c2412c7c0e8771ba9209dbc48137fd0f685cc24892b570690b2e5046e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-07-06T22:00:26Z","title_canon_sha256":"0d3be546ab1295dea19f290afa87e15dcf7af094a49ac790927bb71ca267263d"},"schema_version":"1.0","source":{"id":"1607.01825","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.01825","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"arxiv_version","alias_value":"1607.01825v2","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.01825","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"pith_short_12","alias_value":"GTPR22SD34IG","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GTPR22SD34IGHDXQ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GTPR22SD","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:1a9f036189ac72658dbc6700cebfc473f07b73094aa36b9bb2bc528914102936","target":"graph","created_at":"2026-05-18T00:52:39Z","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":"The Atacama Cosmology Telescope Polarimeter (ACTPol) is a polarization sensitive upgrade to the Atacama Cosmology Telescope. Located at an elevation of 5190 m, ACTPol measures the Cosmic Microwave Background (CMB) temperature and polarization with arcminute-scale angular resolution. Calibration of the detector angles is a critical step in producing maps of the CMB polarization. Polarization angle offsets in the detector calibration can cause leakage in polarization from E to B modes and induce a spurious signal in the EB and TB cross correlations, which eliminates our ability to measure potent","authors_text":"Alessandro Schillaci, Benjamin L. Schmitt, Brian Koopman, Dale Li, Edward J. Wollack, Eve M. Vavagiakis, Federico Nati, Hsiao-mei Cho, Jason Austermann, Jeff McMahon, Johannes Hubmayr, Jonathan T. Ward, Kent D. Irwin, Kevin P. Coughlin, Laura Newburgh, Lyman A. Page, Maria Salatino, Matthew Hasselfield, Michael D. Niemack, Patricio A. Gallardo, Sara M. Simon, Shannon M. Duff, Shawn W. Henderson, Shuay-Pwu Patty Ho","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-07-06T22:00:26Z","title":"Optical modeling and polarization calibration for CMB measurements with ACTPol and Advanced ACTPol"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.01825","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:f3382f6fb1de1d3442bc7aa12d2d6075991f50948b6c711c9da1834d69f8d994","target":"record","created_at":"2026-05-18T00:52:39Z","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":"ab53453c2412c7c0e8771ba9209dbc48137fd0f685cc24892b570690b2e5046e","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-07-06T22:00:26Z","title_canon_sha256":"0d3be546ab1295dea19f290afa87e15dcf7af094a49ac790927bb71ca267263d"},"schema_version":"1.0","source":{"id":"1607.01825","kind":"arxiv","version":2}},"canonical_sha256":"34df1d6a43df10638ef0b3a63caee755ed5530ae23e73e114c9143ef4ecc7b9d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34df1d6a43df10638ef0b3a63caee755ed5530ae23e73e114c9143ef4ecc7b9d","first_computed_at":"2026-05-18T00:52:39.352045Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:39.352045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vrjEcOavLu+t3buGvLyvSvPrj3IQ5buwC+hweLd3QN1T4DSI3baNcIQrcFqgMPRCfMOMRLw2xuhrCHxQX5toDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:39.352512Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.01825","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3382f6fb1de1d3442bc7aa12d2d6075991f50948b6c711c9da1834d69f8d994","sha256:1a9f036189ac72658dbc6700cebfc473f07b73094aa36b9bb2bc528914102936"],"state_sha256":"8e2d3bbd45ba2c87ad8753a5e39912c869b3a1c1f283c64288ca00c4d5522228"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nh+4QqanHn5/8brPAND7m+4uhp4Zh4wYDbfYx1vn0nREXCDIAbHPH22u2hShldvKE/hcy6jfTTZSncnf+O19AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T19:39:48.011601Z","bundle_sha256":"bd5eb2caa0826c8271090ca4335f196be81e862aeaf2b446efd6c4d3183c644c"}}