{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:JQAUU3VW6XAOXVFRDGWZ7BU4FM","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":"f4291ccf433dc8717c980f4745bdc7dbc9dffbb62a2dd37601c527a6093a7201","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-07-16T11:13:38Z","title_canon_sha256":"9a388271e99e99d8e8912b081cffca22fddd0b916581afba2e7905de0f04db0c"},"schema_version":"1.0","source":{"id":"astro-ph/0107271","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0107271","created_at":"2026-05-18T02:40:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0107271v1","created_at":"2026-05-18T02:40:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0107271","created_at":"2026-05-18T02:40:36Z"},{"alias_kind":"pith_short_12","alias_value":"JQAUU3VW6XAO","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"JQAUU3VW6XAOXVFR","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"JQAUU3VW","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:f74fd717eee374db93e07a10bb6e6954b7bfcbb9cfca8afae334c4f9c91563d6","target":"graph","created_at":"2026-05-18T02:40:36Z","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":"Cherenkov radiation produced in Extensive Air Showers shows a net polarization. This article discusses its properties and physical origin, and proposes an arrangement of polarizers potentially useful for Imaging Atmospheric Cherenkov Telescopes.","authors_text":"(2) Universidad Complutense Madrid, (3) MPI fuer Physik - Munich), I. de La Calle (1), J. Cortina (3), J.L. Contreras (2), V. Fonseca (2) ((1) University of Leeds","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-07-16T11:13:38Z","title":"A possible use for polarizers in imaging atmospheric Cherenkov telescopes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0107271","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":"sha256:0b777a7dae45b8a599bfa74e32a7440455d16334c77a84e8dc015031c6e92cdd","target":"record","created_at":"2026-05-18T02:40:36Z","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":"f4291ccf433dc8717c980f4745bdc7dbc9dffbb62a2dd37601c527a6093a7201","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-07-16T11:13:38Z","title_canon_sha256":"9a388271e99e99d8e8912b081cffca22fddd0b916581afba2e7905de0f04db0c"},"schema_version":"1.0","source":{"id":"astro-ph/0107271","kind":"arxiv","version":1}},"canonical_sha256":"4c014a6eb6f5c0ebd4b119ad9f869c2b066260decd62d53feb8289ab19c8fe6c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4c014a6eb6f5c0ebd4b119ad9f869c2b066260decd62d53feb8289ab19c8fe6c","first_computed_at":"2026-05-18T02:40:36.133162Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:40:36.133162Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CTktXP21FExWA077J9/snllRKSPQ+GsQzWSyUFc31pPmDUvRPwKXoeScIi5ZIwqpJBx102d9/Z52A2SvwM0OBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:40:36.133757Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0107271","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0b777a7dae45b8a599bfa74e32a7440455d16334c77a84e8dc015031c6e92cdd","sha256:f74fd717eee374db93e07a10bb6e6954b7bfcbb9cfca8afae334c4f9c91563d6"],"state_sha256":"3caa6b17d5e9461624325c4a2bd166d53ae429fff7f3138d130d5e58fb327774"}