{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:CVNWWTRDO7LDPOARNJQERFSHZO","short_pith_number":"pith:CVNWWTRD","canonical_record":{"source":{"id":"1607.01391","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-05T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"fc4f76f691dae459159fa1a55a81491270531c9416fd429b1bb3ecc67db95a35","abstract_canon_sha256":"0237d4576b3928c694c0f8644566a9888cc6aa1b8064d840a0e6a7916f209172"},"schema_version":"1.0"},"canonical_sha256":"155b6b4e2377d637b8116a60489647cb9b73fb01776ed49eec7c4f2f8bc23a82","source":{"kind":"arxiv","id":"1607.01391","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.01391","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"arxiv_version","alias_value":"1607.01391v2","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.01391","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"pith_short_12","alias_value":"CVNWWTRDO7LD","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"CVNWWTRDO7LDPOAR","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"CVNWWTRD","created_at":"2026-05-18T12:30:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:CVNWWTRDO7LDPOARNJQERFSHZO","target":"record","payload":{"canonical_record":{"source":{"id":"1607.01391","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-05T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"fc4f76f691dae459159fa1a55a81491270531c9416fd429b1bb3ecc67db95a35","abstract_canon_sha256":"0237d4576b3928c694c0f8644566a9888cc6aa1b8064d840a0e6a7916f209172"},"schema_version":"1.0"},"canonical_sha256":"155b6b4e2377d637b8116a60489647cb9b73fb01776ed49eec7c4f2f8bc23a82","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:07.970930Z","signature_b64":"SAxqwComBhtXYd5IZ9npqpdbIAMru9Q3TyiN7gdHUByEVu6tUDXiKavk4orXs6SY1GHyLALrHqgdyYSs9Y60BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"155b6b4e2377d637b8116a60489647cb9b73fb01776ed49eec7c4f2f8bc23a82","last_reissued_at":"2026-05-18T00:53:07.970472Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:07.970472Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1607.01391","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":"2026-05-18T00:53:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CvgmIukkfhvwqc2JWalfgqYIVQrQ58I1EvOnu3ANLOVtqltgnfo/j5mU8reVjmwnXVI1AtXpRTbFQIFTXA3DDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:07:38.293133Z"},"content_sha256":"c26756a3e6e4f572f1c8c17cfd349df2ce92e1d5ce3898d80621e54430b89eae","schema_version":"1.0","event_id":"sha256:c26756a3e6e4f572f1c8c17cfd349df2ce92e1d5ce3898d80621e54430b89eae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:CVNWWTRDO7LDPOARNJQERFSHZO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alistair R. Walker, Andr\\'es Plazas Malag\\'on, Andrew J. Connolly, August E. Evrard, Aur\\'elien Benoit-L\\'evy, Aurelio Carnero Rosell, Basilio Santiago, Brenna Flaugher, Cameron A. Lemon, Carlos E. Cunha, Christopher E. Lidman, Daniel A. Goldstein, Daniel Gruen, Daniel Thomas, David A. Finley, David Brooks, David J. James, David W. Gerdes, Douglas L. Tucker, Elizabeth Buckley-Geer, Emmanuel Bertin, Eric Suchyta, Eusebio Sanchez, Fernanda Ostrovski, Flavia Sobreira, Gaston Gutierrez, Gregory Tarle, H. Thomas Diehl, Huan Lin, Ignacio Sevilla-Noarbe, Jennifer L. Marshall, Johnathan M. Hung, Jorge Carretero, J\\\"org P. Dietrich, Josh Frieman, Kathy Romer, Kevin Reil, Klaus Honscheid, Kyler Kuehn, Luiz N. Da Costa, Manda Banerji, Marcelle Soares-Santos, Marcio A. G. Maia, Marcos Lima, Matias Carrasco Kind, Matthew W. Auger, Nikolay Kuropatkin, Pablo Fosalba, Paul Martini, Peter Melchior, Ramon Miquel, Ricardo Ogando, Richard G. McMahon, Robert A. Gruendl, Sahar Allam, Sergey E. Koposov, Shantanu Desai, Sophie L. Reed, Vic Scarpine","submitted_at":"2016-07-05T20:00:01Z","abstract_excerpt":"We present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift $z_{s}=2.74$ and image separation of $2.9\"$ lensed by a foreground $z_{l}=0.40$ elliptical galaxy. Since the images of gravitationally lensed quasars are the superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and $gi$ multicolour photometric obser"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.01391","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":"2026-05-18T00:53:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zNbr4tGysgJ19+/ApMft0+MRa8uVXkoRH6txcybhBLJfAbckTbf2YTdR8FrXH6yb05dL2Iil7cgiwBdD9PKLAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:07:38.293521Z"},"content_sha256":"1d0984840012406403bb27a072d5717404342b81e24fa57c91933b095ce17930","schema_version":"1.0","event_id":"sha256:1d0984840012406403bb27a072d5717404342b81e24fa57c91933b095ce17930"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CVNWWTRDO7LDPOARNJQERFSHZO/bundle.json","state_url":"https://pith.science/pith/CVNWWTRDO7LDPOARNJQERFSHZO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CVNWWTRDO7LDPOARNJQERFSHZO/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":"2026-05-28T15:07:38Z","links":{"resolver":"https://pith.science/pith/CVNWWTRDO7LDPOARNJQERFSHZO","bundle":"https://pith.science/pith/CVNWWTRDO7LDPOARNJQERFSHZO/bundle.json","state":"https://pith.science/pith/CVNWWTRDO7LDPOARNJQERFSHZO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CVNWWTRDO7LDPOARNJQERFSHZO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:CVNWWTRDO7LDPOARNJQERFSHZO","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":"0237d4576b3928c694c0f8644566a9888cc6aa1b8064d840a0e6a7916f209172","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-05T20:00:01Z","title_canon_sha256":"fc4f76f691dae459159fa1a55a81491270531c9416fd429b1bb3ecc67db95a35"},"schema_version":"1.0","source":{"id":"1607.01391","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.01391","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"arxiv_version","alias_value":"1607.01391v2","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.01391","created_at":"2026-05-18T00:53:07Z"},{"alias_kind":"pith_short_12","alias_value":"CVNWWTRDO7LD","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"CVNWWTRDO7LDPOAR","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"CVNWWTRD","created_at":"2026-05-18T12:30:09Z"}],"graph_snapshots":[{"event_id":"sha256:1d0984840012406403bb27a072d5717404342b81e24fa57c91933b095ce17930","target":"graph","created_at":"2026-05-18T00:53:07Z","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 present the discovery and preliminary characterization of a gravitationally lensed quasar with a source redshift $z_{s}=2.74$ and image separation of $2.9\"$ lensed by a foreground $z_{l}=0.40$ elliptical galaxy. Since the images of gravitationally lensed quasars are the superposition of multiple point sources and a foreground lensing galaxy, we have developed a morphology independent multi-wavelength approach to the photometric selection of lensed quasar candidates based on Gaussian Mixture Models (GMM) supervised machine learning. Using this technique and $gi$ multicolour photometric obser","authors_text":"Alistair R. Walker, Andr\\'es Plazas Malag\\'on, Andrew J. Connolly, August E. Evrard, Aur\\'elien Benoit-L\\'evy, Aurelio Carnero Rosell, Basilio Santiago, Brenna Flaugher, Cameron A. Lemon, Carlos E. Cunha, Christopher E. Lidman, Daniel A. Goldstein, Daniel Gruen, Daniel Thomas, David A. Finley, David Brooks, David J. James, David W. Gerdes, Douglas L. Tucker, Elizabeth Buckley-Geer, Emmanuel Bertin, Eric Suchyta, Eusebio Sanchez, Fernanda Ostrovski, Flavia Sobreira, Gaston Gutierrez, Gregory Tarle, H. Thomas Diehl, Huan Lin, Ignacio Sevilla-Noarbe, Jennifer L. Marshall, Johnathan M. Hung, Jorge Carretero, J\\\"org P. Dietrich, Josh Frieman, Kathy Romer, Kevin Reil, Klaus Honscheid, Kyler Kuehn, Luiz N. Da Costa, Manda Banerji, Marcelle Soares-Santos, Marcio A. G. Maia, Marcos Lima, Matias Carrasco Kind, Matthew W. Auger, Nikolay Kuropatkin, Pablo Fosalba, Paul Martini, Peter Melchior, Ramon Miquel, Ricardo Ogando, Richard G. McMahon, Robert A. Gruendl, Sahar Allam, Sergey E. Koposov, Shantanu Desai, Sophie L. Reed, Vic Scarpine","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-05T20:00:01Z","title":"VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.01391","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:c26756a3e6e4f572f1c8c17cfd349df2ce92e1d5ce3898d80621e54430b89eae","target":"record","created_at":"2026-05-18T00:53:07Z","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":"0237d4576b3928c694c0f8644566a9888cc6aa1b8064d840a0e6a7916f209172","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-07-05T20:00:01Z","title_canon_sha256":"fc4f76f691dae459159fa1a55a81491270531c9416fd429b1bb3ecc67db95a35"},"schema_version":"1.0","source":{"id":"1607.01391","kind":"arxiv","version":2}},"canonical_sha256":"155b6b4e2377d637b8116a60489647cb9b73fb01776ed49eec7c4f2f8bc23a82","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"155b6b4e2377d637b8116a60489647cb9b73fb01776ed49eec7c4f2f8bc23a82","first_computed_at":"2026-05-18T00:53:07.970472Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:07.970472Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SAxqwComBhtXYd5IZ9npqpdbIAMru9Q3TyiN7gdHUByEVu6tUDXiKavk4orXs6SY1GHyLALrHqgdyYSs9Y60BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:07.970930Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.01391","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c26756a3e6e4f572f1c8c17cfd349df2ce92e1d5ce3898d80621e54430b89eae","sha256:1d0984840012406403bb27a072d5717404342b81e24fa57c91933b095ce17930"],"state_sha256":"2a05ad84ff3cb1e307cde8d64679def330fc83c294795133544bb181a0238acd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7QLobY5CXh7E8BiX0zNrIaKM0Nt1H9IAg4CKqcFvveBxzG/bfWK4CS1bM+Z6s6+pWM4BQum/kiSL7LqBYme/BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T15:07:38.295656Z","bundle_sha256":"82351bb4ba234fc61aeb9f35b2ad250a5668f3e318904cea27c3020ab39ecd09"}}