{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:XWADQ7B4JDDYY37YLI3FMA2BNS","short_pith_number":"pith:XWADQ7B4","canonical_record":{"source":{"id":"1307.8061","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-30T17:43:40Z","cross_cats_sorted":[],"title_canon_sha256":"cc7a6b53b973076684ea23da81f2d452de8a6c64ab9389fcdc1953e8ac309785","abstract_canon_sha256":"4d7551957d2e91fd5d826477371b988ebee6e7fd2c302e95c709220229d38c6c"},"schema_version":"1.0"},"canonical_sha256":"bd80387c3c48c78c6ff85a365603416c8cf685ceb12fb8980f841c04e000ae6f","source":{"kind":"arxiv","id":"1307.8061","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.8061","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"arxiv_version","alias_value":"1307.8061v2","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.8061","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"pith_short_12","alias_value":"XWADQ7B4JDDY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"XWADQ7B4JDDYY37Y","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"XWADQ7B4","created_at":"2026-05-18T12:28:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:XWADQ7B4JDDYY37YLI3FMA2BNS","target":"record","payload":{"canonical_record":{"source":{"id":"1307.8061","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-30T17:43:40Z","cross_cats_sorted":[],"title_canon_sha256":"cc7a6b53b973076684ea23da81f2d452de8a6c64ab9389fcdc1953e8ac309785","abstract_canon_sha256":"4d7551957d2e91fd5d826477371b988ebee6e7fd2c302e95c709220229d38c6c"},"schema_version":"1.0"},"canonical_sha256":"bd80387c3c48c78c6ff85a365603416c8cf685ceb12fb8980f841c04e000ae6f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:32.736339Z","signature_b64":"1EDD5pZNNUczmV7meCRSkhquRIrvs+t8RBo4xkm2tUvIOu6S2d4I7adhf760bp9Il3ozDFO4Ioxl4/ooJFMkAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bd80387c3c48c78c6ff85a365603416c8cf685ceb12fb8980f841c04e000ae6f","last_reissued_at":"2026-05-18T01:48:32.735636Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:32.735636Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.8061","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:48:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y5A4H+BIn26Qb1AdgOE53AXO+HlMKp9mobE//uD2tPfZSl939SJJzaCq2GIFp52vC1YBWy6n+hrZmWGkgpDSBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:22:47.487430Z"},"content_sha256":"b63d0b508667cdea91cdb751840276b90a2e961921300a0d38a5a368f6cb1345","schema_version":"1.0","event_id":"sha256:b63d0b508667cdea91cdb751840276b90a2e961921300a0d38a5a368f6cb1345"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:XWADQ7B4JDDYY37YLI3FMA2BNS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimising Spectroscopic and Photometric Galaxy Surveys: Efficient Target Selection and Survey Strategy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"D. Kirk, F. B. Abdalla, H. Lin, J. A. Frieman, J. Annis, O. Lahav, R. Kron, S. Jouvel","submitted_at":"2013-07-30T17:43:40Z","abstract_excerpt":"The next generation of spectroscopic surveys will have a wealth of photometric data available for use in target selection. Selecting the best targets is likely to be one of the most important hurdles in making these spectroscopic campaigns as successful as possible. Our ability to measure dark energy depends strongly on the types of targets that we are able to select with a given photometric data set. We show in this paper that we will be able to successfully select the targets needed for the next generation of spectroscopic surveys. We also investigate the details of this selection, including"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.8061","kind":"arxiv","version":2},"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":"2026-05-18T01:48:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yip36ArqsoxyJxagjpqsHDp7HQ+3SjEAB9E82J1+OlCVoToADkjX3pfbJm2yfIirrHik47S7aSdsFAtPizYLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:22:47.487786Z"},"content_sha256":"cca44b76da176f70057dd2ac35de12a8720c71c65ba088c7d57442cede402bf6","schema_version":"1.0","event_id":"sha256:cca44b76da176f70057dd2ac35de12a8720c71c65ba088c7d57442cede402bf6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/bundle.json","state_url":"https://pith.science/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/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":"2026-06-01T22:22:47Z","links":{"resolver":"https://pith.science/pith/XWADQ7B4JDDYY37YLI3FMA2BNS","bundle":"https://pith.science/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/bundle.json","state":"https://pith.science/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XWADQ7B4JDDYY37YLI3FMA2BNS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:XWADQ7B4JDDYY37YLI3FMA2BNS","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":"4d7551957d2e91fd5d826477371b988ebee6e7fd2c302e95c709220229d38c6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-30T17:43:40Z","title_canon_sha256":"cc7a6b53b973076684ea23da81f2d452de8a6c64ab9389fcdc1953e8ac309785"},"schema_version":"1.0","source":{"id":"1307.8061","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.8061","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"arxiv_version","alias_value":"1307.8061v2","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.8061","created_at":"2026-05-18T01:48:32Z"},{"alias_kind":"pith_short_12","alias_value":"XWADQ7B4JDDY","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"XWADQ7B4JDDYY37Y","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"XWADQ7B4","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:cca44b76da176f70057dd2ac35de12a8720c71c65ba088c7d57442cede402bf6","target":"graph","created_at":"2026-05-18T01:48:32Z","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 next generation of spectroscopic surveys will have a wealth of photometric data available for use in target selection. Selecting the best targets is likely to be one of the most important hurdles in making these spectroscopic campaigns as successful as possible. Our ability to measure dark energy depends strongly on the types of targets that we are able to select with a given photometric data set. We show in this paper that we will be able to successfully select the targets needed for the next generation of spectroscopic surveys. We also investigate the details of this selection, including","authors_text":"D. Kirk, F. B. Abdalla, H. Lin, J. A. Frieman, J. Annis, O. Lahav, R. Kron, S. Jouvel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-30T17:43:40Z","title":"Optimising Spectroscopic and Photometric Galaxy Surveys: Efficient Target Selection and Survey Strategy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.8061","kind":"arxiv","version":2},"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:b63d0b508667cdea91cdb751840276b90a2e961921300a0d38a5a368f6cb1345","target":"record","created_at":"2026-05-18T01:48:32Z","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":"4d7551957d2e91fd5d826477371b988ebee6e7fd2c302e95c709220229d38c6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-30T17:43:40Z","title_canon_sha256":"cc7a6b53b973076684ea23da81f2d452de8a6c64ab9389fcdc1953e8ac309785"},"schema_version":"1.0","source":{"id":"1307.8061","kind":"arxiv","version":2}},"canonical_sha256":"bd80387c3c48c78c6ff85a365603416c8cf685ceb12fb8980f841c04e000ae6f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bd80387c3c48c78c6ff85a365603416c8cf685ceb12fb8980f841c04e000ae6f","first_computed_at":"2026-05-18T01:48:32.735636Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:32.735636Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1EDD5pZNNUczmV7meCRSkhquRIrvs+t8RBo4xkm2tUvIOu6S2d4I7adhf760bp9Il3ozDFO4Ioxl4/ooJFMkAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:32.736339Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.8061","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b63d0b508667cdea91cdb751840276b90a2e961921300a0d38a5a368f6cb1345","sha256:cca44b76da176f70057dd2ac35de12a8720c71c65ba088c7d57442cede402bf6"],"state_sha256":"3a49d17cee8dac287c9864600a45b611d8e47edb067561f060e38d846e7e2afa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+NwRnqOATH0uL0bv4dsJMxFmltqZncD4Kb8AOdWqL8SyeQu7VncjaGKOTrPniOaDoO2fFuR4kFzrNBXJuQNNAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T22:22:47.489728Z","bundle_sha256":"0b2ff75c89b9cbe9fe2ec15ea3c23e2864239770a7e35430ac0c56357ae8cc30"}}