{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:TJQIHEU5PX2RV6LLOJM4UTO7UM","short_pith_number":"pith:TJQIHEU5","canonical_record":{"source":{"id":"0907.0865","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-07-05T15:23:51Z","cross_cats_sorted":[],"title_canon_sha256":"6d8ca06fe935f47efbdea5aa8ed28008cd8ff706013e8c2daef8319fb5817936","abstract_canon_sha256":"1371e01dd51f06c11b3ed79ea9d8265e4a5882021bccdbe09749337d41f1b0b8"},"schema_version":"1.0"},"canonical_sha256":"9a6083929d7df51af96b7259ca4ddfa30575cce05d00b4f269486839d2c3495c","source":{"kind":"arxiv","id":"0907.0865","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.0865","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"arxiv_version","alias_value":"0907.0865v1","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.0865","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_12","alias_value":"TJQIHEU5PX2R","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_16","alias_value":"TJQIHEU5PX2RV6LL","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_8","alias_value":"TJQIHEU5","created_at":"2026-07-04T23:53:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:TJQIHEU5PX2RV6LLOJM4UTO7UM","target":"record","payload":{"canonical_record":{"source":{"id":"0907.0865","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-07-05T15:23:51Z","cross_cats_sorted":[],"title_canon_sha256":"6d8ca06fe935f47efbdea5aa8ed28008cd8ff706013e8c2daef8319fb5817936","abstract_canon_sha256":"1371e01dd51f06c11b3ed79ea9d8265e4a5882021bccdbe09749337d41f1b0b8"},"schema_version":"1.0"},"canonical_sha256":"9a6083929d7df51af96b7259ca4ddfa30575cce05d00b4f269486839d2c3495c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:53:01.356519Z","signature_b64":"zt1YhDl3Ifa3dISQI4DNKCmEws1Zz8nKdFccAyZHHRn1CWxuasGCgHQj7KjIhT+niHz/VM5CGv90rvZBV1iKBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9a6083929d7df51af96b7259ca4ddfa30575cce05d00b4f269486839d2c3495c","last_reissued_at":"2026-07-04T23:53:01.356133Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:53:01.356133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.0865","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":"2026-07-04T23:53:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lB8BeceeCnAXZ5f1yOZyFCnjlJLv3ikIk8FwapjLwQKNUt1VNtf3/XR8jl3vuAUZ9vptOswLTGs3uN6KQxjADA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T07:45:30.845887Z"},"content_sha256":"e60a49cbab6b24e17c77e4b0a4658ca42874410a25c97e982ec7e602354d8016","schema_version":"1.0","event_id":"sha256:e60a49cbab6b24e17c77e4b0a4658ca42874410a25c97e982ec7e602354d8016"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:TJQIHEU5PX2RV6LLOJM4UTO7UM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Development of HPD Clusters for MAGIC-II","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Dettlaff, D. Bose, D. Fink, E. Bernardini, E. Lorenz, J. Hose, K. Mannheim, M. Hayashida, M. Shayduk, M. Teshima (for the MAGIC collaboration), O. Reimann, R. Mirzoyan, R. Orito, T. Schweizer, T. Y. Saito, V. Fonseca","submitted_at":"2009-07-05T15:23:51Z","abstract_excerpt":"MAGIC-II is the second imaging atmospheric Cherenkov telescope of the MAGIC observatory, which has recently been inaugurated on Canary island of La Palma. We are currently developing a new camera based on clusters of hybrid photon detectors (HPD) for the upgrade of MAGIC-II. The photon detectors feature a GaAsP photocathode and an avalanche diode as electron bombarded anodes with internal gain, and were supplied by Hamamatsu Photonics K.K. (R9792U-40). The HPD camera with high quantum efficiency will increase the MAGIC-II sensitivity and lower the energy threshold. The basic performance of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.0865","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0907.0865/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:53:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"83Rbquxsr+MwrwCDAz24gYtXmiLsuux8pt8mQrK2+oI1kM4OHwF5cOPEHt1YU2HIg2mk7cxMckXXAU+rYUQ0CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T07:45:30.846256Z"},"content_sha256":"6686a3a2a15561acfde28ebd547fad253b9763eef69e91200114cf27dfb015aa","schema_version":"1.0","event_id":"sha256:6686a3a2a15561acfde28ebd547fad253b9763eef69e91200114cf27dfb015aa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/bundle.json","state_url":"https://pith.science/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/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":"2026-07-05T07:45:30Z","links":{"resolver":"https://pith.science/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM","bundle":"https://pith.science/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/bundle.json","state":"https://pith.science/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TJQIHEU5PX2RV6LLOJM4UTO7UM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:TJQIHEU5PX2RV6LLOJM4UTO7UM","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":"1371e01dd51f06c11b3ed79ea9d8265e4a5882021bccdbe09749337d41f1b0b8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-07-05T15:23:51Z","title_canon_sha256":"6d8ca06fe935f47efbdea5aa8ed28008cd8ff706013e8c2daef8319fb5817936"},"schema_version":"1.0","source":{"id":"0907.0865","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.0865","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"arxiv_version","alias_value":"0907.0865v1","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.0865","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_12","alias_value":"TJQIHEU5PX2R","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_16","alias_value":"TJQIHEU5PX2RV6LL","created_at":"2026-07-04T23:53:01Z"},{"alias_kind":"pith_short_8","alias_value":"TJQIHEU5","created_at":"2026-07-04T23:53:01Z"}],"graph_snapshots":[{"event_id":"sha256:6686a3a2a15561acfde28ebd547fad253b9763eef69e91200114cf27dfb015aa","target":"graph","created_at":"2026-07-04T23:53:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0907.0865/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"MAGIC-II is the second imaging atmospheric Cherenkov telescope of the MAGIC observatory, which has recently been inaugurated on Canary island of La Palma. We are currently developing a new camera based on clusters of hybrid photon detectors (HPD) for the upgrade of MAGIC-II. The photon detectors feature a GaAsP photocathode and an avalanche diode as electron bombarded anodes with internal gain, and were supplied by Hamamatsu Photonics K.K. (R9792U-40). The HPD camera with high quantum efficiency will increase the MAGIC-II sensitivity and lower the energy threshold. The basic performance of the","authors_text":"A. Dettlaff, D. Bose, D. Fink, E. Bernardini, E. Lorenz, J. Hose, K. Mannheim, M. Hayashida, M. Shayduk, M. Teshima (for the MAGIC collaboration), O. Reimann, R. Mirzoyan, R. Orito, T. Schweizer, T. Y. Saito, V. Fonseca","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-07-05T15:23:51Z","title":"Development of HPD Clusters for MAGIC-II"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.0865","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:e60a49cbab6b24e17c77e4b0a4658ca42874410a25c97e982ec7e602354d8016","target":"record","created_at":"2026-07-04T23:53:01Z","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":"1371e01dd51f06c11b3ed79ea9d8265e4a5882021bccdbe09749337d41f1b0b8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-07-05T15:23:51Z","title_canon_sha256":"6d8ca06fe935f47efbdea5aa8ed28008cd8ff706013e8c2daef8319fb5817936"},"schema_version":"1.0","source":{"id":"0907.0865","kind":"arxiv","version":1}},"canonical_sha256":"9a6083929d7df51af96b7259ca4ddfa30575cce05d00b4f269486839d2c3495c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9a6083929d7df51af96b7259ca4ddfa30575cce05d00b4f269486839d2c3495c","first_computed_at":"2026-07-04T23:53:01.356133Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:53:01.356133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zt1YhDl3Ifa3dISQI4DNKCmEws1Zz8nKdFccAyZHHRn1CWxuasGCgHQj7KjIhT+niHz/VM5CGv90rvZBV1iKBQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:53:01.356519Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.0865","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e60a49cbab6b24e17c77e4b0a4658ca42874410a25c97e982ec7e602354d8016","sha256:6686a3a2a15561acfde28ebd547fad253b9763eef69e91200114cf27dfb015aa"],"state_sha256":"aecaccec4816f37c8f8a22f5001432e0c1806773f687281fc2a983593bf6c635"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wute7BMULaQFVqNEUu1vtmv8608DlVWAnG9G5tfhI/ninnT8YeYWrwKEnQbaY1rHs4kiixBkjgPrNHNVO6TMCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T07:45:30.848424Z","bundle_sha256":"e3ff5dbfa346e1b5514b97715abffa26f9952a521d06072e9adf9c4c4fa9e068"}}