{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:ISGHSY4IHM33SWOCL5QXSZDPIU","short_pith_number":"pith:ISGHSY4I","canonical_record":{"source":{"id":"1407.2278","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-08T21:30:54Z","cross_cats_sorted":[],"title_canon_sha256":"71409432fd951f27c101907453c16211122dc9df8cfe077b73e1b88078d9471e","abstract_canon_sha256":"85a675c52c20ee6fbaf76f51f80a9a4d4444a0e3dbda3ac7da0ccccaa4fe083e"},"schema_version":"1.0"},"canonical_sha256":"448c7963883b37b959c25f6179646f450176fda4c11c2edceae3515eb609b0f8","source":{"kind":"arxiv","id":"1407.2278","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2278","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2278v1","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2278","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"pith_short_12","alias_value":"ISGHSY4IHM33","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"ISGHSY4IHM33SWOC","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"ISGHSY4I","created_at":"2026-05-18T12:28:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:ISGHSY4IHM33SWOCL5QXSZDPIU","target":"record","payload":{"canonical_record":{"source":{"id":"1407.2278","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-08T21:30:54Z","cross_cats_sorted":[],"title_canon_sha256":"71409432fd951f27c101907453c16211122dc9df8cfe077b73e1b88078d9471e","abstract_canon_sha256":"85a675c52c20ee6fbaf76f51f80a9a4d4444a0e3dbda3ac7da0ccccaa4fe083e"},"schema_version":"1.0"},"canonical_sha256":"448c7963883b37b959c25f6179646f450176fda4c11c2edceae3515eb609b0f8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:40.629363Z","signature_b64":"AH3cDcDjXlHkz4sy4Rk58jS5F/cPNf5xNjihSviJbDYnNLqBxAedSIuIN1fjnE+RGQOZKV1jSgLrfhX+a0rqBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"448c7963883b37b959c25f6179646f450176fda4c11c2edceae3515eb609b0f8","last_reissued_at":"2026-05-18T01:42:40.628893Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:40.628893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.2278","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":"2026-05-18T01:42:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kKyhv1ME1/XNDubmelq6abhjAv4fFfbzp3rly8oB4/ijajwVg+5jBoBljkD6d9B6y+D0aqwD3WTayoW5v+RmDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T20:36:11.519032Z"},"content_sha256":"fe2327c5b0bc9e03cf5752824c35c6054d47e818119d73d69754c2193c2011b0","schema_version":"1.0","event_id":"sha256:fe2327c5b0bc9e03cf5752824c35c6054d47e818119d73d69754c2193c2011b0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:ISGHSY4IHM33SWOCL5QXSZDPIU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Andrew Cardwell, Brian Bauman, Bruce Macintosh, Daren Dillon, David W. Palmer, Dmitry Savransky, Donald Gavel, Fredrik T. Rantakyro, Jean-Pierre Veran, Jeffrey K. Chilcote, Lisa A. Poyneer, Markus Hartung, Marshall D. Perrin, Naru Sadakuni, Pascale Hibon, Robert J. De Rosa, Sandrine Thomas, Stephen J. Goodsell","submitted_at":"2014-07-08T21:30:54Z","abstract_excerpt":"The Gemini Planet Imager instrument's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. It features several new technologies, including computationally efficient wavefront reconstruction with the Fourier transform, modal gain optimization every 8 seconds, and the spatially filtered wavefront sensor. It also uses a Linear-Quadratic-Gaussian (LQG) controller (aka Kalman filter) for both pointing and focus. We present on-sky performance results from verification and commissioning runs from December 2013 through May 2014. The efficient reconstruction and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2278","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":"2026-05-18T01:42:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aWLO7NxnIQyKgt+ieWkMkouMsrC5DzfybszHgBs1rONOuLYMU0+6vlq5LHMPuGhPMIzVoY+r0pR/gPno64/zAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T20:36:11.519616Z"},"content_sha256":"6b9d793fe3532a611b713019f0681bc88876899d3cca954d23bab957d4a084e5","schema_version":"1.0","event_id":"sha256:6b9d793fe3532a611b713019f0681bc88876899d3cca954d23bab957d4a084e5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/bundle.json","state_url":"https://pith.science/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/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":"2026-05-18T20:36:11Z","links":{"resolver":"https://pith.science/pith/ISGHSY4IHM33SWOCL5QXSZDPIU","bundle":"https://pith.science/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/bundle.json","state":"https://pith.science/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ISGHSY4IHM33SWOCL5QXSZDPIU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ISGHSY4IHM33SWOCL5QXSZDPIU","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":"85a675c52c20ee6fbaf76f51f80a9a4d4444a0e3dbda3ac7da0ccccaa4fe083e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-08T21:30:54Z","title_canon_sha256":"71409432fd951f27c101907453c16211122dc9df8cfe077b73e1b88078d9471e"},"schema_version":"1.0","source":{"id":"1407.2278","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.2278","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"arxiv_version","alias_value":"1407.2278v1","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.2278","created_at":"2026-05-18T01:42:40Z"},{"alias_kind":"pith_short_12","alias_value":"ISGHSY4IHM33","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"ISGHSY4IHM33SWOC","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"ISGHSY4I","created_at":"2026-05-18T12:28:33Z"}],"graph_snapshots":[{"event_id":"sha256:6b9d793fe3532a611b713019f0681bc88876899d3cca954d23bab957d4a084e5","target":"graph","created_at":"2026-05-18T01:42:40Z","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 Gemini Planet Imager instrument's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. It features several new technologies, including computationally efficient wavefront reconstruction with the Fourier transform, modal gain optimization every 8 seconds, and the spatially filtered wavefront sensor. It also uses a Linear-Quadratic-Gaussian (LQG) controller (aka Kalman filter) for both pointing and focus. We present on-sky performance results from verification and commissioning runs from December 2013 through May 2014. The efficient reconstruction and","authors_text":"Andrew Cardwell, Brian Bauman, Bruce Macintosh, Daren Dillon, David W. Palmer, Dmitry Savransky, Donald Gavel, Fredrik T. Rantakyro, Jean-Pierre Veran, Jeffrey K. Chilcote, Lisa A. Poyneer, Markus Hartung, Marshall D. Perrin, Naru Sadakuni, Pascale Hibon, Robert J. De Rosa, Sandrine Thomas, Stephen J. Goodsell","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-08T21:30:54Z","title":"On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.2278","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:fe2327c5b0bc9e03cf5752824c35c6054d47e818119d73d69754c2193c2011b0","target":"record","created_at":"2026-05-18T01:42:40Z","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":"85a675c52c20ee6fbaf76f51f80a9a4d4444a0e3dbda3ac7da0ccccaa4fe083e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-07-08T21:30:54Z","title_canon_sha256":"71409432fd951f27c101907453c16211122dc9df8cfe077b73e1b88078d9471e"},"schema_version":"1.0","source":{"id":"1407.2278","kind":"arxiv","version":1}},"canonical_sha256":"448c7963883b37b959c25f6179646f450176fda4c11c2edceae3515eb609b0f8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"448c7963883b37b959c25f6179646f450176fda4c11c2edceae3515eb609b0f8","first_computed_at":"2026-05-18T01:42:40.628893Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:40.628893Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AH3cDcDjXlHkz4sy4Rk58jS5F/cPNf5xNjihSviJbDYnNLqBxAedSIuIN1fjnE+RGQOZKV1jSgLrfhX+a0rqBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:40.629363Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.2278","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fe2327c5b0bc9e03cf5752824c35c6054d47e818119d73d69754c2193c2011b0","sha256:6b9d793fe3532a611b713019f0681bc88876899d3cca954d23bab957d4a084e5"],"state_sha256":"2c13593531686c58a512c96f376ded609fd93df451f826a4d1b422742f2c5a15"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MobXfCX+vH93EHug8L0EmGJl5Sz/2t1XX/UKtcJpViBSVCtaKzA5cB1LF4vDnJ7snLY6EkgevWMA5aCWNWqRAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T20:36:11.521451Z","bundle_sha256":"04d8771d585ced92bf0fd2111bdea87174dbe496970107e3865bbbfc4161d044"}}