{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:SIQVQAEQCV5GRTLK3VQAY3H2UV","short_pith_number":"pith:SIQVQAEQ","canonical_record":{"source":{"id":"1610.01990","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-06T18:41:52Z","cross_cats_sorted":["hep-ex","physics.ins-det"],"title_canon_sha256":"7ea3181ef67f8f06c6812c84285f46b16c5195a584be05e283ad49036b334114","abstract_canon_sha256":"4c0af1ee28cf51f90765f25d3e0efcda65fe40f52452f70c5b3eb8cb64da45a7"},"schema_version":"1.0"},"canonical_sha256":"9221580090157a68cd6add600c6cfaa54d94eb42c626c3c86e73350948768a87","source":{"kind":"arxiv","id":"1610.01990","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01990","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01990v1","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01990","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"pith_short_12","alias_value":"SIQVQAEQCV5G","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SIQVQAEQCV5GRTLK","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SIQVQAEQ","created_at":"2026-05-18T12:30:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:SIQVQAEQCV5GRTLK3VQAY3H2UV","target":"record","payload":{"canonical_record":{"source":{"id":"1610.01990","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-06T18:41:52Z","cross_cats_sorted":["hep-ex","physics.ins-det"],"title_canon_sha256":"7ea3181ef67f8f06c6812c84285f46b16c5195a584be05e283ad49036b334114","abstract_canon_sha256":"4c0af1ee28cf51f90765f25d3e0efcda65fe40f52452f70c5b3eb8cb64da45a7"},"schema_version":"1.0"},"canonical_sha256":"9221580090157a68cd6add600c6cfaa54d94eb42c626c3c86e73350948768a87","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:54:16.505020Z","signature_b64":"zUT+aOflu8FALiJp0XLQQv0kZ4LpVpDA3MsniDDZ3fXCFlZWLGhqVzzBtxdsWszCgV5PtUjZaAjuNOReuNFFAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9221580090157a68cd6add600c6cfaa54d94eb42c626c3c86e73350948768a87","last_reissued_at":"2026-05-18T00:54:16.504421Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:54:16.504421Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.01990","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":"2026-05-18T00:54:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+nOgr3I7UaFpolmwOuK8l9msWRpYOpSBsWvhbNIkxuG+sUY4NSCcbWeQIXZ+Qr0vtTmHzq9G0RageoUnIN73AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T17:26:33.528464Z"},"content_sha256":"3d2d6903b4cb20428a80f5658473edd807d85d8df2cf64aa3892883fca4c5be8","schema_version":"1.0","event_id":"sha256:3d2d6903b4cb20428a80f5658473edd807d85d8df2cf64aa3892883fca4c5be8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:SIQVQAEQCV5GRTLK3VQAY3H2UV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photon Detection Efficiency Measurements of the VERITAS Cherenkov Telescope Photomultipliers after four Years of Operation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","physics.ins-det"],"primary_cat":"astro-ph.IM","authors_text":"Eliza Gazda, Gregory Richards, Nepomuk Otte, Thanh Nguyen","submitted_at":"2016-10-06T18:41:52Z","abstract_excerpt":"The photon detection efficiency of two sets of R10560-100-20 superbialkali photomultiplier tubes from Hamamatsu were measured between 200 nm and 750 nm to quantify a possible degradation of the photocathode sensitivity after four years of operation in the cameras of the VERITAS Cherenkov telescopes. A sample of 20 photomultiplier tubes, which was removed from the telescopes was compared with a sample of 20 spare photomultiplier tubes, which had been kept in storage. It is found that the average photocathode sensitivity marginally increased below 300 nm and dropped by 10% to 30% above 500 nm. T"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01990","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":"2026-05-18T00:54:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fuEdY0g4B5IfNBLftbcZN2fnV/u1BnIMhfDmxzHPrQZBx/xU+YqBv9mnH83BGT4HefUbRn76+5cPxISItMCaBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T17:26:33.528808Z"},"content_sha256":"55b8889362066ede02d820ff39c2c48525fa48a3f17ec9ff89e9fa77e7a23b51","schema_version":"1.0","event_id":"sha256:55b8889362066ede02d820ff39c2c48525fa48a3f17ec9ff89e9fa77e7a23b51"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/bundle.json","state_url":"https://pith.science/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/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":"2026-06-28T17:26:33Z","links":{"resolver":"https://pith.science/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV","bundle":"https://pith.science/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/bundle.json","state":"https://pith.science/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SIQVQAEQCV5GRTLK3VQAY3H2UV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:SIQVQAEQCV5GRTLK3VQAY3H2UV","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":"4c0af1ee28cf51f90765f25d3e0efcda65fe40f52452f70c5b3eb8cb64da45a7","cross_cats_sorted":["hep-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-06T18:41:52Z","title_canon_sha256":"7ea3181ef67f8f06c6812c84285f46b16c5195a584be05e283ad49036b334114"},"schema_version":"1.0","source":{"id":"1610.01990","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.01990","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"arxiv_version","alias_value":"1610.01990v1","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.01990","created_at":"2026-05-18T00:54:16Z"},{"alias_kind":"pith_short_12","alias_value":"SIQVQAEQCV5G","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SIQVQAEQCV5GRTLK","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SIQVQAEQ","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:55b8889362066ede02d820ff39c2c48525fa48a3f17ec9ff89e9fa77e7a23b51","target":"graph","created_at":"2026-05-18T00:54:16Z","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 photon detection efficiency of two sets of R10560-100-20 superbialkali photomultiplier tubes from Hamamatsu were measured between 200 nm and 750 nm to quantify a possible degradation of the photocathode sensitivity after four years of operation in the cameras of the VERITAS Cherenkov telescopes. A sample of 20 photomultiplier tubes, which was removed from the telescopes was compared with a sample of 20 spare photomultiplier tubes, which had been kept in storage. It is found that the average photocathode sensitivity marginally increased below 300 nm and dropped by 10% to 30% above 500 nm. T","authors_text":"Eliza Gazda, Gregory Richards, Nepomuk Otte, Thanh Nguyen","cross_cats":["hep-ex","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-06T18:41:52Z","title":"Photon Detection Efficiency Measurements of the VERITAS Cherenkov Telescope Photomultipliers after four Years of Operation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.01990","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":"sha256:3d2d6903b4cb20428a80f5658473edd807d85d8df2cf64aa3892883fca4c5be8","target":"record","created_at":"2026-05-18T00:54:16Z","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":"4c0af1ee28cf51f90765f25d3e0efcda65fe40f52452f70c5b3eb8cb64da45a7","cross_cats_sorted":["hep-ex","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-10-06T18:41:52Z","title_canon_sha256":"7ea3181ef67f8f06c6812c84285f46b16c5195a584be05e283ad49036b334114"},"schema_version":"1.0","source":{"id":"1610.01990","kind":"arxiv","version":1}},"canonical_sha256":"9221580090157a68cd6add600c6cfaa54d94eb42c626c3c86e73350948768a87","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9221580090157a68cd6add600c6cfaa54d94eb42c626c3c86e73350948768a87","first_computed_at":"2026-05-18T00:54:16.504421Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:54:16.504421Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zUT+aOflu8FALiJp0XLQQv0kZ4LpVpDA3MsniDDZ3fXCFlZWLGhqVzzBtxdsWszCgV5PtUjZaAjuNOReuNFFAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:54:16.505020Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.01990","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d2d6903b4cb20428a80f5658473edd807d85d8df2cf64aa3892883fca4c5be8","sha256:55b8889362066ede02d820ff39c2c48525fa48a3f17ec9ff89e9fa77e7a23b51"],"state_sha256":"9815637a8c8110adc4a2701d67eae1c84c38144e139f8fe5dda1c2502fd10c26"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RUhJvnsLmcFGWyi+zsi4a7qdSQhGMTIUGew2L+dgsSvkx/1q+lYZDKS7xl1pflJ0YenZOqcagh8hDwsOCkmACA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T17:26:33.530677Z","bundle_sha256":"9997eef4f07b588f148be45c59342a2bd5ebcc19bc4b89a7e74abdc6508f8322"}}