{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:BALKX4B4IXHZGM6RDDB3LNSCKP","short_pith_number":"pith:BALKX4B4","canonical_record":{"source":{"id":"0910.3277","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-10-17T06:07:40Z","cross_cats_sorted":[],"title_canon_sha256":"8d0a208c52e20305ddfc40141dba5afaf1dfe4571c36cd8148d75d180faeff28","abstract_canon_sha256":"6659ffd73e45693bb9de227f3ae1ff5bbd2681a600d9db08ac3c962d09156f8c"},"schema_version":"1.0"},"canonical_sha256":"0816abf03c45cf9333d118c3b5b64253e8f66b145ca8b7d567571de4fdd497d1","source":{"kind":"arxiv","id":"0910.3277","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.3277","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"arxiv_version","alias_value":"0910.3277v1","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.3277","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"pith_short_12","alias_value":"BALKX4B4IXHZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BALKX4B4IXHZGM6R","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BALKX4B4","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:BALKX4B4IXHZGM6RDDB3LNSCKP","target":"record","payload":{"canonical_record":{"source":{"id":"0910.3277","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-10-17T06:07:40Z","cross_cats_sorted":[],"title_canon_sha256":"8d0a208c52e20305ddfc40141dba5afaf1dfe4571c36cd8148d75d180faeff28","abstract_canon_sha256":"6659ffd73e45693bb9de227f3ae1ff5bbd2681a600d9db08ac3c962d09156f8c"},"schema_version":"1.0"},"canonical_sha256":"0816abf03c45cf9333d118c3b5b64253e8f66b145ca8b7d567571de4fdd497d1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:18.491176Z","signature_b64":"fAbVvXqbDhrM4bPH34sOjde2SquizK1PyyS8Bvb1o8SA1crmyupR6x/pVtxXaGM92E+XUKGRclMi9RuGr/FlDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0816abf03c45cf9333d118c3b5b64253e8f66b145ca8b7d567571de4fdd497d1","last_reissued_at":"2026-05-18T02:34:18.489957Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:18.489957Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0910.3277","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":"2026-05-18T02:34:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A/vCHvHlXEmSyKckmBmn535VUEXnquBKj0Wqe/gSxCrK20hPOmEjzIMpSSLTNmOhAF6mSqjl7UasCy0Cfj4ECQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:17:19.026592Z"},"content_sha256":"527af70dea6e1ef5191c16dcb395191c3dc02b6b52b9287fab87827331774902","schema_version":"1.0","event_id":"sha256:527af70dea6e1ef5191c16dcb395191c3dc02b6b52b9287fab87827331774902"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:BALKX4B4IXHZGM6RDDB3LNSCKP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A New Mirror Alignment System for the VERITAS Telescopes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. McCann, D. Hanna, J.Kildea, M. McCutcheon","submitted_at":"2009-10-17T06:07:40Z","abstract_excerpt":"Imaging atmospheric Cherenkov telescopes (IACTs) used for ground-based gamma-ray astronomy at TeV energies use reflectors with areas on the order of 100m$^2$ as their primary optic. These tessellated reflectors comprise hundreds of mirror facets mounted on a space frame to achieve this large area at a reasonable cost. To achieve a reflecting surface of sufficient quality one must precisely orient each facet using a procedure known as alignment. We describe here an alignment system which uses a digital (CCD) camera placed at the focus of the optical system, facing the reflector. The camera acqu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.3277","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":"2026-05-18T02:34:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B641fa43aIVQM9txec+rotbuF3H0hAls1nI4svMX4TShNq0WCKxT2L/soGE65afkFc4rZNEv5/kNS5JrjRtHDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:17:19.027327Z"},"content_sha256":"fabf0f9e0c0b2ad590f279d3579fb855cf16029a0172082f3ae2bc3d18a54678","schema_version":"1.0","event_id":"sha256:fabf0f9e0c0b2ad590f279d3579fb855cf16029a0172082f3ae2bc3d18a54678"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/bundle.json","state_url":"https://pith.science/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/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":"2026-05-25T18:17:19Z","links":{"resolver":"https://pith.science/pith/BALKX4B4IXHZGM6RDDB3LNSCKP","bundle":"https://pith.science/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/bundle.json","state":"https://pith.science/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BALKX4B4IXHZGM6RDDB3LNSCKP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BALKX4B4IXHZGM6RDDB3LNSCKP","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":"6659ffd73e45693bb9de227f3ae1ff5bbd2681a600d9db08ac3c962d09156f8c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-10-17T06:07:40Z","title_canon_sha256":"8d0a208c52e20305ddfc40141dba5afaf1dfe4571c36cd8148d75d180faeff28"},"schema_version":"1.0","source":{"id":"0910.3277","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.3277","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"arxiv_version","alias_value":"0910.3277v1","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.3277","created_at":"2026-05-18T02:34:18Z"},{"alias_kind":"pith_short_12","alias_value":"BALKX4B4IXHZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BALKX4B4IXHZGM6R","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BALKX4B4","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:fabf0f9e0c0b2ad590f279d3579fb855cf16029a0172082f3ae2bc3d18a54678","target":"graph","created_at":"2026-05-18T02:34:18Z","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":"Imaging atmospheric Cherenkov telescopes (IACTs) used for ground-based gamma-ray astronomy at TeV energies use reflectors with areas on the order of 100m$^2$ as their primary optic. These tessellated reflectors comprise hundreds of mirror facets mounted on a space frame to achieve this large area at a reasonable cost. To achieve a reflecting surface of sufficient quality one must precisely orient each facet using a procedure known as alignment. We describe here an alignment system which uses a digital (CCD) camera placed at the focus of the optical system, facing the reflector. The camera acqu","authors_text":"A. McCann, D. Hanna, J.Kildea, M. McCutcheon","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-10-17T06:07:40Z","title":"A New Mirror Alignment System for the VERITAS Telescopes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.3277","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":"sha256:527af70dea6e1ef5191c16dcb395191c3dc02b6b52b9287fab87827331774902","target":"record","created_at":"2026-05-18T02:34:18Z","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":"6659ffd73e45693bb9de227f3ae1ff5bbd2681a600d9db08ac3c962d09156f8c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-10-17T06:07:40Z","title_canon_sha256":"8d0a208c52e20305ddfc40141dba5afaf1dfe4571c36cd8148d75d180faeff28"},"schema_version":"1.0","source":{"id":"0910.3277","kind":"arxiv","version":1}},"canonical_sha256":"0816abf03c45cf9333d118c3b5b64253e8f66b145ca8b7d567571de4fdd497d1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0816abf03c45cf9333d118c3b5b64253e8f66b145ca8b7d567571de4fdd497d1","first_computed_at":"2026-05-18T02:34:18.489957Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:18.489957Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fAbVvXqbDhrM4bPH34sOjde2SquizK1PyyS8Bvb1o8SA1crmyupR6x/pVtxXaGM92E+XUKGRclMi9RuGr/FlDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:18.491176Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.3277","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:527af70dea6e1ef5191c16dcb395191c3dc02b6b52b9287fab87827331774902","sha256:fabf0f9e0c0b2ad590f279d3579fb855cf16029a0172082f3ae2bc3d18a54678"],"state_sha256":"debe59c1afd97fb9fa5447cd086d23a5c50b94a5f7af62c9acb0f330aa80d324"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Oz6owC+H/81lZ7Rbh7NYUf5eJC5NgN8c++ZMwkTbmWpSjqx9Hwe/jxYpsMaTlUEIWqNmBLiFOC/hcsu0lagAAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:17:19.031195Z","bundle_sha256":"ebc9c00269e7b4353b1cfcc9fb9fa26ed55373c978674da0a409e94097c0cb68"}}