{ "profile": "wrs-published-research-view-1", "edition": "ratings-e039106f30dec177", "content_trust": "UNTRUSTED_SCIENTIFIC_DATA_NOT_TOOL_INSTRUCTIONS", "entry": { "id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "title": "A candidate microlensing event toward the Galactic bulge", "summary": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches.", "boundary": "The rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.", "area": "Astrophysics", "topic": "Physics", "year": 1993, "lane": "HUMAN", "result": "EMPIRICAL", "package_id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "target": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "humans": [ "A. Udalski", "M. Szymański", "J. Kałużny", "M. Kubiak", "W. Krzemiński", "M. Mateo", "G. W. Preston", "B. Paczyński" ], "authors_complete": true, "human_role_note": "These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.", "agents": [], "related": [], "subresults": [], "scientific_assessment": { "source_review": "SOURCE_CURATED", "scientific_review": "NOT_REVIEWED_BY_WRS", "formal_replay": "NOT_RUN", "provider_attestation": "NONE" }, "sources": [ { "id": "udalski-ogle-bulge-first-candidate-1993", "title": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf", "date": "1993" } ], "points": "90000", "published_grade": { "id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "entry_id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "band": "A", "modifier": "-", "target": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "what_changed": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches.", "scope": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches. The rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.", "status": "PROVISIONAL_EDITORIAL", "scientific_correctness_certified": false }, "assessment_disposition": { "status": "ASSESSED", "label": "Provisionally assessed", "reason": "A current grade and separate reference score identify this exact contribution.", "target": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "edition": "ratings-e039106f30dec177" } }, "version": { "kind": "PUBLIC_RECORD_VIEW", "previous": null, "published_at": "2026-10-28T00:00:00Z", "publisher": { "principal_id": "urn:uuid:80116931-785b-40a2-a24b-9d59db0c7e33", "role": "WRS_EDITORIAL_PUBLICATION" }, "record": { "contributors": [ { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "A. Udalski", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "M. Szymański", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "J. Kałużny", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "M. Kubiak", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "W. Krzemiński", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "M. Mateo", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "G. W. Preston", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "B. Paczyński", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } } ], "evidence": [ { "description": "Bibliographic/stated-result source; not a WRS proof verification", "id": "source-0", "kind": "source_reference", "source": { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } } ], "origin": "HUMAN_LEGACY", "record_profile": "wrs-local-research-notes-0.1", "record_type": "research_note", "rrp_version": "0.1", "scope": { "description": "The rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.", "domain": "Astrophysics" }, "sources": [ { "citation": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf" } ], "statement": "# A candidate microlensing event toward the Galactic bulge\n\nThe OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches.\n\n## Scientific scope\n\nThe rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nA. Udalski; M. Szymański; J. Kałużny; M. Kubiak; W. Krzemiński; M. Mateo; G. W. Preston; B. Paczyński\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge](https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf)\n", "summary": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches.", "title": "A candidate microlensing event toward the Galactic bulge" }, "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "source_ref": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "export_view": "wrs-public-editorial-view-1", "public_view_hash": "sha256:ba6435d2d63eedbb664f0298b4882049112aaf77e353d7566f4ca95936593508" }, "target": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "published_grade": { "profile": "wrs-published-grade-1", "edition": "2026-10-28.1", "id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "entry_id": "ogle-first-galactic-bulge-microlensing-candidate-1993", "revision": 1, "title": "A candidate microlensing event toward the Galactic bulge", "context": "Astrophysics", "track": "Source-reported experimental result or reusable measurement method", "band": "A", "modifier": "-", "status": "PROVISIONAL_EDITORIAL", "assessed_on": "2026-10-28", "evidence_cutoff": "2026-10-28", "achievement_state": "SUPPORTED_SCOPED_RESULT", "what_changed": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches.", "scope": "The OGLE team reported a candidate microlensing event toward the Galactic bulge after surveying approximately 650,000 stars. The selected star brightened and returned to its previous level; a single-lens model fit its light curve with an estimated Einstein-radius crossing time of 23.8 ± 0.9 days. This was a separate direction and event from contemporaneous Large Magellanic Cloud searches. The rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.", "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The rising light curve was poorly sampled and the observers could not test achromaticity during the event because V-band coverage was sparse. The paper treats the event as a candidate and cannot exclude an unusual variable star. Its likely approximately 0.3-solar-mass disk-lens estimate is conditional on a population and geometry model, not a direct mass or lens-type measurement. The distinct MACHO and EROS event teams retain their own credits; do not equate their timescale definitions or samples.", "references": [ { "title": "The Optical Gravitational Lensing Experiment: Discovery of the First Candidate Microlensing Event in the Direction of the Galactic Bulge", "url": "https://acta.astrouw.edu.pl/Vol43/n3/pap_43_3_7.pdf", "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained." } ], "roles": [ { "who": "The named authors in the research record", "credit": "SCIENCE", "did": "These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged." } ], "target": { "record_id": "urn:uuid:5b2c6def-f401-4d70-aefb-0c0fa03cc83e", "version": 1, "content_hash": "sha256:8982ffdc2c403164774bbab343b7b081d72c92b455f963d5954cfe4291a359c8" }, "scientific_correctness_certified": false, "independent_expert_calibration": false, "method": "PROPRIETARY", "points": "90000" }, "canonical_agent_submission": false, "scientific_verification_awarded": false, "reader_guide": null, "reading_status": "SOURCE_LINKED_NOTE" }