{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:DQHQY6UFDW5G6LT2U5KYOHOOS7","short_pith_number":"pith:DQHQY6UF","canonical_record":{"source":{"id":"2006.11875","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-06-21T18:47:18Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8e38c86be66f71363051ab90a111862e73a243838db1683e2854ed215e167dde","abstract_canon_sha256":"7686c91db1ee70e52eab87a933f2d1e42da72aa429d7f17b66368e96f0f460da"},"schema_version":"1.0"},"canonical_sha256":"1c0f0c7a851dba6f2e7aa755871dce97d185f691fb3ddfad0f8960d22547282f","source":{"kind":"arxiv","id":"2006.11875","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.11875","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"arxiv_version","alias_value":"2006.11875v1","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.11875","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_12","alias_value":"DQHQY6UFDW5G","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"DQHQY6UFDW5G6LT2","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"DQHQY6UF","created_at":"2026-07-05T01:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:DQHQY6UFDW5G6LT2U5KYOHOOS7","target":"record","payload":{"canonical_record":{"source":{"id":"2006.11875","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-06-21T18:47:18Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"8e38c86be66f71363051ab90a111862e73a243838db1683e2854ed215e167dde","abstract_canon_sha256":"7686c91db1ee70e52eab87a933f2d1e42da72aa429d7f17b66368e96f0f460da"},"schema_version":"1.0"},"canonical_sha256":"1c0f0c7a851dba6f2e7aa755871dce97d185f691fb3ddfad0f8960d22547282f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:32:08.553769Z","signature_b64":"9gEYeyQkzunBl5RPWNonRWfscSPjPI6z/QxpDDAIOjoXOc5s4CVeQx0ULjPW1iR7w3UavO+eGcVUinZLqmh+Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1c0f0c7a851dba6f2e7aa755871dce97d185f691fb3ddfad0f8960d22547282f","last_reissued_at":"2026-07-05T01:32:08.552053Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:32:08.552053Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2006.11875","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":"2026-07-05T01:32:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UBKsHlgqWsU1xd/uzVch3mnfEsREb74+Xgi41czNw2ofMs02zoOxzoTD+1nQJcEYX70/JNDcbAIWkNN1JjmZBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T12:50:52.448131Z"},"content_sha256":"93bfb544a01fa833217f7dd8a4a4f3bbb3f80b8a743af4ef68b604b43fc94924","schema_version":"1.0","event_id":"sha256:93bfb544a01fa833217f7dd8a4a4f3bbb3f80b8a743af4ef68b604b43fc94924"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:DQHQY6UFDW5G6LT2U5KYOHOOS7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"GREGOR: Optics Redesign and Updates from 2018-2020","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.IM","authors_text":"Felix Kr\\\"amer, Karin Gerber, Lucia Kleint, Miguel Esteves, Olivier Grassin, Reiner Volkmer, Svetlana Berdyugina, Thomas Berkefeld, Thomas Sonner","submitted_at":"2020-06-21T18:47:18Z","abstract_excerpt":"The GREGOR telescope was inaugurated in 2012. In 2018, we started a complete upgrade, involving optics, alignment, instrumentation, mechanical upgrades for vibration reduction, updated control systems, and building enhancements and, in addition, adapted management and policies. This paper describes all major updates performed during this time. Since 2012, all powered mirrors except for M1 were exchanged. Starting from 2020, GREGOR observes with diffraction-limited performance and a new optics and instrument layout."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.11875","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/2006.11875/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":"2026-07-05T01:32:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AS3ggAFteUlhWBTgzBXrJtYDWSg3BWqK95V3/mu3fZNxlG16gncU3xhtPGFGrrxmV0MrMrs8mLz0CfwpJby7CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T12:50:52.448953Z"},"content_sha256":"395d23723079b949faf5fb8e9baea243b661acae5666dd93c7a78cd4edc2a14f","schema_version":"1.0","event_id":"sha256:395d23723079b949faf5fb8e9baea243b661acae5666dd93c7a78cd4edc2a14f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/bundle.json","state_url":"https://pith.science/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/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":"2026-08-18T12:50:52Z","links":{"resolver":"https://pith.science/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7","bundle":"https://pith.science/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/bundle.json","state":"https://pith.science/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DQHQY6UFDW5G6LT2U5KYOHOOS7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:DQHQY6UFDW5G6LT2U5KYOHOOS7","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":"7686c91db1ee70e52eab87a933f2d1e42da72aa429d7f17b66368e96f0f460da","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-06-21T18:47:18Z","title_canon_sha256":"8e38c86be66f71363051ab90a111862e73a243838db1683e2854ed215e167dde"},"schema_version":"1.0","source":{"id":"2006.11875","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2006.11875","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"arxiv_version","alias_value":"2006.11875v1","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2006.11875","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_12","alias_value":"DQHQY6UFDW5G","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"DQHQY6UFDW5G6LT2","created_at":"2026-07-05T01:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"DQHQY6UF","created_at":"2026-07-05T01:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:395d23723079b949faf5fb8e9baea243b661acae5666dd93c7a78cd4edc2a14f","target":"graph","created_at":"2026-07-05T01:32:08Z","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/2006.11875/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The GREGOR telescope was inaugurated in 2012. In 2018, we started a complete upgrade, involving optics, alignment, instrumentation, mechanical upgrades for vibration reduction, updated control systems, and building enhancements and, in addition, adapted management and policies. This paper describes all major updates performed during this time. Since 2012, all powered mirrors except for M1 were exchanged. Starting from 2020, GREGOR observes with diffraction-limited performance and a new optics and instrument layout.","authors_text":"Felix Kr\\\"amer, Karin Gerber, Lucia Kleint, Miguel Esteves, Olivier Grassin, Reiner Volkmer, Svetlana Berdyugina, Thomas Berkefeld, Thomas Sonner","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-06-21T18:47:18Z","title":"GREGOR: Optics Redesign and Updates from 2018-2020"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.11875","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":"sha256:93bfb544a01fa833217f7dd8a4a4f3bbb3f80b8a743af4ef68b604b43fc94924","target":"record","created_at":"2026-07-05T01:32:08Z","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":"7686c91db1ee70e52eab87a933f2d1e42da72aa429d7f17b66368e96f0f460da","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2020-06-21T18:47:18Z","title_canon_sha256":"8e38c86be66f71363051ab90a111862e73a243838db1683e2854ed215e167dde"},"schema_version":"1.0","source":{"id":"2006.11875","kind":"arxiv","version":1}},"canonical_sha256":"1c0f0c7a851dba6f2e7aa755871dce97d185f691fb3ddfad0f8960d22547282f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1c0f0c7a851dba6f2e7aa755871dce97d185f691fb3ddfad0f8960d22547282f","first_computed_at":"2026-07-05T01:32:08.552053Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:32:08.552053Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9gEYeyQkzunBl5RPWNonRWfscSPjPI6z/QxpDDAIOjoXOc5s4CVeQx0ULjPW1iR7w3UavO+eGcVUinZLqmh+Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:32:08.553769Z","signed_message":"canonical_sha256_bytes"},"source_id":"2006.11875","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93bfb544a01fa833217f7dd8a4a4f3bbb3f80b8a743af4ef68b604b43fc94924","sha256:395d23723079b949faf5fb8e9baea243b661acae5666dd93c7a78cd4edc2a14f"],"state_sha256":"4a5621ad53726ef5d74aa3151f7aca442bf8b73e03a6c69d4b8697b4567368fe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BcW1pxj+JdxZPvKY+IlntWP3Rd2eqBXkCVtCbIioFWnBxAOD4w/t3vCaB5sSMh39B1N4irs36e8Zr+hcvsOhBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T12:50:52.454141Z","bundle_sha256":"d2f040b6831cad04962db9907b96d06981738b779bbffa8eabb217087bfefe4d"}}