{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:LF443ERR4PJCEHOHKEZLQ6DJFN","short_pith_number":"pith:LF443ERR","schema_version":"1.0","canonical_sha256":"5979cd9231e3d2221dc75132b878692b5a057e2d786afc91c0d7f8fbed6a91e6","source":{"kind":"arxiv","id":"1610.02607","version":1},"attestation_state":"computed","paper":{"title":"The External Calibrator for Hydrogen Observatories","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Abraham R. Neben, Benjamin Stinnett, Daniel C. Jacobs, Jacob Burba, Judd Bowman, Lauren Turner","submitted_at":"2016-10-09T01:01:15Z","abstract_excerpt":"Multiple instruments are pursuing constraints on dark energy, observing reionization and opening a window on the dark ages through the detection and characterization of the 21cm hydrogen line across the redshift spectrum, from nearby to z=25. These instruments, including CHIME in the sub-meter and HERA in the meter bands, are wide-field arrays with multiple-degree beams, typically operating in transit mode. Accurate knowledge of their primary beams is critical for separation of bright foregrounds from the desired cosmological signals, but difficult to achieve through astronomical observations "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1610.02607","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-09T01:01:15Z","cross_cats_sorted":[],"title_canon_sha256":"e996ddfaa8d276bd29de1fdeb80b016b2a017f1bf585933a28a60e5c37dcf820","abstract_canon_sha256":"5d3e8bd307ad230ea0cc5e18b5fdaac0c750913130f6bdba7da4c83b548a496c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:02:51.147132Z","signature_b64":"yX8mFtLZGdUiFzfNutCXtqF8syzXCDLGrzyJdrYZDVOivdYfI6nI9wnZXKdnOxaGdHig4kV3sJP8uHPo1bC/Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5979cd9231e3d2221dc75132b878692b5a057e2d786afc91c0d7f8fbed6a91e6","last_reissued_at":"2026-05-18T01:02:51.146721Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:02:51.146721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The External Calibrator for Hydrogen Observatories","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Abraham R. Neben, Benjamin Stinnett, Daniel C. Jacobs, Jacob Burba, Judd Bowman, Lauren Turner","submitted_at":"2016-10-09T01:01:15Z","abstract_excerpt":"Multiple instruments are pursuing constraints on dark energy, observing reionization and opening a window on the dark ages through the detection and characterization of the 21cm hydrogen line across the redshift spectrum, from nearby to z=25. These instruments, including CHIME in the sub-meter and HERA in the meter bands, are wide-field arrays with multiple-degree beams, typically operating in transit mode. Accurate knowledge of their primary beams is critical for separation of bright foregrounds from the desired cosmological signals, but difficult to achieve through astronomical observations "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.02607","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1610.02607","created_at":"2026-05-18T01:02:51.146776+00:00"},{"alias_kind":"arxiv_version","alias_value":"1610.02607v1","created_at":"2026-05-18T01:02:51.146776+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.02607","created_at":"2026-05-18T01:02:51.146776+00:00"},{"alias_kind":"pith_short_12","alias_value":"LF443ERR4PJC","created_at":"2026-05-18T12:30:29.479603+00:00"},{"alias_kind":"pith_short_16","alias_value":"LF443ERR4PJCEHOH","created_at":"2026-05-18T12:30:29.479603+00:00"},{"alias_kind":"pith_short_8","alias_value":"LF443ERR","created_at":"2026-05-18T12:30:29.479603+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2604.09859","citing_title":"PEACC -- Precision Emitter for 21 cm Array Coherent Calibration","ref_index":13,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN","json":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN.json","graph_json":"https://pith.science/api/pith-number/LF443ERR4PJCEHOHKEZLQ6DJFN/graph.json","events_json":"https://pith.science/api/pith-number/LF443ERR4PJCEHOHKEZLQ6DJFN/events.json","paper":"https://pith.science/paper/LF443ERR"},"agent_actions":{"view_html":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN","download_json":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN.json","view_paper":"https://pith.science/paper/LF443ERR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1610.02607&json=true","fetch_graph":"https://pith.science/api/pith-number/LF443ERR4PJCEHOHKEZLQ6DJFN/graph.json","fetch_events":"https://pith.science/api/pith-number/LF443ERR4PJCEHOHKEZLQ6DJFN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN/action/storage_attestation","attest_author":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN/action/author_attestation","sign_citation":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN/action/citation_signature","submit_replication":"https://pith.science/pith/LF443ERR4PJCEHOHKEZLQ6DJFN/action/replication_record"}},"created_at":"2026-05-18T01:02:51.146776+00:00","updated_at":"2026-05-18T01:02:51.146776+00:00"}