{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:OXQX7XQ7OSOKYKDXHSNDTMU4SA","short_pith_number":"pith:OXQX7XQ7","canonical_record":{"source":{"id":"1501.00328","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-01-01T22:53:27Z","cross_cats_sorted":[],"title_canon_sha256":"f9dfac854ffbc4fbf129d5cdc6d5aa2b0954d9fc6baa223643d91ef7a69ed961","abstract_canon_sha256":"a720dc11eacaf41d82854e8bdb5b7090eaad4c6ebe03f766467d4b0464143948"},"schema_version":"1.0"},"canonical_sha256":"75e17fde1f749cac28773c9a39b29c903ae8702b84d9e6f8ecee7aa0810c8b21","source":{"kind":"arxiv","id":"1501.00328","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.00328","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"arxiv_version","alias_value":"1501.00328v1","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.00328","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"pith_short_12","alias_value":"OXQX7XQ7OSOK","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OXQX7XQ7OSOKYKDX","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OXQX7XQ7","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:OXQX7XQ7OSOKYKDXHSNDTMU4SA","target":"record","payload":{"canonical_record":{"source":{"id":"1501.00328","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-01-01T22:53:27Z","cross_cats_sorted":[],"title_canon_sha256":"f9dfac854ffbc4fbf129d5cdc6d5aa2b0954d9fc6baa223643d91ef7a69ed961","abstract_canon_sha256":"a720dc11eacaf41d82854e8bdb5b7090eaad4c6ebe03f766467d4b0464143948"},"schema_version":"1.0"},"canonical_sha256":"75e17fde1f749cac28773c9a39b29c903ae8702b84d9e6f8ecee7aa0810c8b21","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:30.502575Z","signature_b64":"lNurhWLkoI6dpG8qCURVsymC3uEvR53umYA5h7NqW99nnzr2yFraPF+Qzu35MQxp7mbbiQ2I1R4iYE2Py+rXAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75e17fde1f749cac28773c9a39b29c903ae8702b84d9e6f8ecee7aa0810c8b21","last_reissued_at":"2026-05-18T01:19:30.502095Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:30.502095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.00328","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":"2026-05-18T01:19:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7KZiRkI6bRwM3lBmAhYMvL/sRK+1veYu9uj0AlHP1p6dlPlWYrDUl0GJ4rvJMYOmcglhiDK05qWJuvCdISMTCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:17:21.187838Z"},"content_sha256":"399b0265eba5cb28ddfa6dff55558f3135b50caf471f1e155b6f7e6371cc4d6c","schema_version":"1.0","event_id":"sha256:399b0265eba5cb28ddfa6dff55558f3135b50caf471f1e155b6f7e6371cc4d6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:OXQX7XQ7OSOKYKDXHSNDTMU4SA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fiber scrambling for high-resolution spectrographs. II. A double fiber scrambler for Keck Observatory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Andrew E. Szymkowiak, Colby Jurgenson, Debra A. Fischer, Jeff Valenti, John Moriarty, Julien F.P. Spronck, Zachary Kaplan","submitted_at":"2015-01-01T22:53:27Z","abstract_excerpt":"We have designed a fiber scrambler as a prototype for the Keck HIRES spectrograph, using double scrambling to stabilize illumination of the spectrometer and a pupil slicer to increase spectral resolution to R = 70,000 with minimal slit losses. We find that the spectral line spread function (SLSF) for the double scrambler observations is 18 times more stable than the SLSF for comparable slit observations and 9 times more stable than the SLSF for a single fiber scrambler that we tested in 2010. For the double scrambler test data, we further reduced the radial velocity scatter from an average of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.00328","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":"2026-05-18T01:19:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j1WGmEUf1bpLMyf9TBk6oAmaMBI0RCKOQyyyeNa2wGcxOIIMvVn9asJh+XnGgRL9suvLFZUm6+usr5giswsADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:17:21.188513Z"},"content_sha256":"3068af508f11dda7b2b16e7f41d67bba541f203b84d4ba2904d18ae9ce6319fd","schema_version":"1.0","event_id":"sha256:3068af508f11dda7b2b16e7f41d67bba541f203b84d4ba2904d18ae9ce6319fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/bundle.json","state_url":"https://pith.science/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/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":"2026-05-28T23:17:21Z","links":{"resolver":"https://pith.science/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA","bundle":"https://pith.science/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/bundle.json","state":"https://pith.science/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OXQX7XQ7OSOKYKDXHSNDTMU4SA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:OXQX7XQ7OSOKYKDXHSNDTMU4SA","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":"a720dc11eacaf41d82854e8bdb5b7090eaad4c6ebe03f766467d4b0464143948","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-01-01T22:53:27Z","title_canon_sha256":"f9dfac854ffbc4fbf129d5cdc6d5aa2b0954d9fc6baa223643d91ef7a69ed961"},"schema_version":"1.0","source":{"id":"1501.00328","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.00328","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"arxiv_version","alias_value":"1501.00328v1","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.00328","created_at":"2026-05-18T01:19:30Z"},{"alias_kind":"pith_short_12","alias_value":"OXQX7XQ7OSOK","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OXQX7XQ7OSOKYKDX","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OXQX7XQ7","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:3068af508f11dda7b2b16e7f41d67bba541f203b84d4ba2904d18ae9ce6319fd","target":"graph","created_at":"2026-05-18T01:19:30Z","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":"We have designed a fiber scrambler as a prototype for the Keck HIRES spectrograph, using double scrambling to stabilize illumination of the spectrometer and a pupil slicer to increase spectral resolution to R = 70,000 with minimal slit losses. We find that the spectral line spread function (SLSF) for the double scrambler observations is 18 times more stable than the SLSF for comparable slit observations and 9 times more stable than the SLSF for a single fiber scrambler that we tested in 2010. For the double scrambler test data, we further reduced the radial velocity scatter from an average of ","authors_text":"Andrew E. Szymkowiak, Colby Jurgenson, Debra A. Fischer, Jeff Valenti, John Moriarty, Julien F.P. Spronck, Zachary Kaplan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-01-01T22:53:27Z","title":"Fiber scrambling for high-resolution spectrographs. II. A double fiber scrambler for Keck Observatory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.00328","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":"sha256:399b0265eba5cb28ddfa6dff55558f3135b50caf471f1e155b6f7e6371cc4d6c","target":"record","created_at":"2026-05-18T01:19:30Z","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":"a720dc11eacaf41d82854e8bdb5b7090eaad4c6ebe03f766467d4b0464143948","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-01-01T22:53:27Z","title_canon_sha256":"f9dfac854ffbc4fbf129d5cdc6d5aa2b0954d9fc6baa223643d91ef7a69ed961"},"schema_version":"1.0","source":{"id":"1501.00328","kind":"arxiv","version":1}},"canonical_sha256":"75e17fde1f749cac28773c9a39b29c903ae8702b84d9e6f8ecee7aa0810c8b21","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75e17fde1f749cac28773c9a39b29c903ae8702b84d9e6f8ecee7aa0810c8b21","first_computed_at":"2026-05-18T01:19:30.502095Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:30.502095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lNurhWLkoI6dpG8qCURVsymC3uEvR53umYA5h7NqW99nnzr2yFraPF+Qzu35MQxp7mbbiQ2I1R4iYE2Py+rXAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:30.502575Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.00328","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:399b0265eba5cb28ddfa6dff55558f3135b50caf471f1e155b6f7e6371cc4d6c","sha256:3068af508f11dda7b2b16e7f41d67bba541f203b84d4ba2904d18ae9ce6319fd"],"state_sha256":"89fcc50c1b66172082ac2a7f29f60b7fe880e76b89e34bccddab7fbb87f6708a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E4jXOJnq+maAC7Fa1hCO2TPghYZ9DBHxKfBLk6W6nMRjb+cFTVbt9Vbo2tQIJnSY9hWDgiHwKvgAL09yiHrSCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T23:17:21.191942Z","bundle_sha256":"bfe16c5ed916d3809e3520ff459f539942300f1e337b42b992dc0ac2329cf799"}}