{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:5P6KA3SME7M5JPEXKD3BCLHNPT","short_pith_number":"pith:5P6KA3SM","canonical_record":{"source":{"id":"1502.05432","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-02-18T22:24:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"6b1765124c8f9cf17aaad35ada6432e8a6af8bef955fc8847563571f33d7abdd","abstract_canon_sha256":"aa8f806ad3a94d8057e54cd1e2246e789323ed121e7108e59b1d69fa45ce8b94"},"schema_version":"1.0"},"canonical_sha256":"ebfca06e4c27d9d4bc9750f6112ced7cdea563b413388de4064f505d24e7b3e8","source":{"kind":"arxiv","id":"1502.05432","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05432","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05432v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05432","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"5P6KA3SME7M5","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"5P6KA3SME7M5JPEX","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"5P6KA3SM","created_at":"2026-05-18T12:29:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:5P6KA3SME7M5JPEXKD3BCLHNPT","target":"record","payload":{"canonical_record":{"source":{"id":"1502.05432","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-02-18T22:24:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"6b1765124c8f9cf17aaad35ada6432e8a6af8bef955fc8847563571f33d7abdd","abstract_canon_sha256":"aa8f806ad3a94d8057e54cd1e2246e789323ed121e7108e59b1d69fa45ce8b94"},"schema_version":"1.0"},"canonical_sha256":"ebfca06e4c27d9d4bc9750f6112ced7cdea563b413388de4064f505d24e7b3e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:26:46.548151Z","signature_b64":"aBtzZ+QBujhTIPndjpg2Q5yN9WBNbjqIpKbu4urFCFnKhvx0htR8xIv7EzpcG16GFu+uPgzGtM8dL7TbtJymAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ebfca06e4c27d9d4bc9750f6112ced7cdea563b413388de4064f505d24e7b3e8","last_reissued_at":"2026-05-18T02:26:46.547745Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:26:46.547745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.05432","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eSaXThqg0d6K550FRygiEAFdbLbWYgUmdCwHAyHtOheImOOxT7rAsNkGwkYi0KJkd5e3ZlvnPJLx6xGGw7fNDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:31:38.505375Z"},"content_sha256":"ecc923ac19603355075fecf1028e98f2d86c3491454da88d3467f40cd892392c","schema_version":"1.0","event_id":"sha256:ecc923ac19603355075fecf1028e98f2d86c3491454da88d3467f40cd892392c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:5P6KA3SME7M5JPEXKD3BCLHNPT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The VLT Survey Telescope ATLAS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"(2) Institute of Astronomy, A. Kupcu Yoldas (2), B. Chehade (1), Durham University, E. Gonzalez-Solares (2), E.T.W. Sutorius (3), J.R. Findlay (1), J.R. Lewis (2), M.A. Read (3), M.J. Irwin (2), N. Metcalfe (1), R.G.Mann (3), S. Voutsinas (3) ((1) Dept of Physics, T. Shanks (1), UK, UK), UK (3) Institute for Astronomy, University of Cambridge, University of Edinburgh","submitted_at":"2015-02-18T22:24:07Z","abstract_excerpt":"The VLT Survey Telescope (VST) ATLAS is an optical ugriz survey aiming to cover ~4700deg^2 of the Southern sky to similar depths as the Sloan Digital Sky Survey (SDSS). From reduced images and object catalogues provided by the Cambridge Astronomical Surveys Unit we first find that the median seeing ranges from 0.8 arcsec FWHM in i to 1.0 arcsec in u, significantly better than the 1.2-1.5 arcsec seeing for SDSS. The 5 sigma magnitude limit for stellar sources is r_AB=22.7 and in all bands these limits are at least as faint as SDSS. SDSS and ATLAS are more equivalent for galaxy photometry except"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05432","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":"2026-05-18T02:26:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9N9/4KeY+S+n62hYlhNnaLMltMS42JMdXyNlkvd0wunwtMOJso4bFVKqNtdWjipy/HkSayp2TI0OgLBkbpMwDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:31:38.506122Z"},"content_sha256":"83198da4a9518cabad57738741f7f36cf110bb97282d2d07d8aafa9f9a373dc2","schema_version":"1.0","event_id":"sha256:83198da4a9518cabad57738741f7f36cf110bb97282d2d07d8aafa9f9a373dc2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/bundle.json","state_url":"https://pith.science/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/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":"2026-05-26T16:31:38Z","links":{"resolver":"https://pith.science/pith/5P6KA3SME7M5JPEXKD3BCLHNPT","bundle":"https://pith.science/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/bundle.json","state":"https://pith.science/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5P6KA3SME7M5JPEXKD3BCLHNPT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:5P6KA3SME7M5JPEXKD3BCLHNPT","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":"aa8f806ad3a94d8057e54cd1e2246e789323ed121e7108e59b1d69fa45ce8b94","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-02-18T22:24:07Z","title_canon_sha256":"6b1765124c8f9cf17aaad35ada6432e8a6af8bef955fc8847563571f33d7abdd"},"schema_version":"1.0","source":{"id":"1502.05432","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.05432","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1502.05432v1","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.05432","created_at":"2026-05-18T02:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"5P6KA3SME7M5","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"5P6KA3SME7M5JPEX","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"5P6KA3SM","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:83198da4a9518cabad57738741f7f36cf110bb97282d2d07d8aafa9f9a373dc2","target":"graph","created_at":"2026-05-18T02:26:46Z","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 VLT Survey Telescope (VST) ATLAS is an optical ugriz survey aiming to cover ~4700deg^2 of the Southern sky to similar depths as the Sloan Digital Sky Survey (SDSS). From reduced images and object catalogues provided by the Cambridge Astronomical Surveys Unit we first find that the median seeing ranges from 0.8 arcsec FWHM in i to 1.0 arcsec in u, significantly better than the 1.2-1.5 arcsec seeing for SDSS. The 5 sigma magnitude limit for stellar sources is r_AB=22.7 and in all bands these limits are at least as faint as SDSS. SDSS and ATLAS are more equivalent for galaxy photometry except","authors_text":"(2) Institute of Astronomy, A. Kupcu Yoldas (2), B. Chehade (1), Durham University, E. Gonzalez-Solares (2), E.T.W. Sutorius (3), J.R. Findlay (1), J.R. Lewis (2), M.A. Read (3), M.J. Irwin (2), N. Metcalfe (1), R.G.Mann (3), S. Voutsinas (3) ((1) Dept of Physics, T. Shanks (1), UK, UK), UK (3) Institute for Astronomy, University of Cambridge, University of Edinburgh","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-02-18T22:24:07Z","title":"The VLT Survey Telescope ATLAS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.05432","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:ecc923ac19603355075fecf1028e98f2d86c3491454da88d3467f40cd892392c","target":"record","created_at":"2026-05-18T02:26:46Z","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":"aa8f806ad3a94d8057e54cd1e2246e789323ed121e7108e59b1d69fa45ce8b94","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-02-18T22:24:07Z","title_canon_sha256":"6b1765124c8f9cf17aaad35ada6432e8a6af8bef955fc8847563571f33d7abdd"},"schema_version":"1.0","source":{"id":"1502.05432","kind":"arxiv","version":1}},"canonical_sha256":"ebfca06e4c27d9d4bc9750f6112ced7cdea563b413388de4064f505d24e7b3e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ebfca06e4c27d9d4bc9750f6112ced7cdea563b413388de4064f505d24e7b3e8","first_computed_at":"2026-05-18T02:26:46.547745Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:26:46.547745Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aBtzZ+QBujhTIPndjpg2Q5yN9WBNbjqIpKbu4urFCFnKhvx0htR8xIv7EzpcG16GFu+uPgzGtM8dL7TbtJymAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:26:46.548151Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.05432","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ecc923ac19603355075fecf1028e98f2d86c3491454da88d3467f40cd892392c","sha256:83198da4a9518cabad57738741f7f36cf110bb97282d2d07d8aafa9f9a373dc2"],"state_sha256":"959573b27a5ef2d5ff0aaba54f5fb3891e62dbb599e70e8111b72b0164ff2f99"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ywtq3MX0wpKnQthfMOBBv7+RC5w5Clz7pu5BZn1Zde8svuWHMU5fKbWPq+hS5DGp6gA6h2Qj6KoPiTfPa7agCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:31:38.509758Z","bundle_sha256":"e24be83485a250a595b866f6370a84de90936d40f15e8a1abcbaa8edc8d8a161"}}