{
  "profile": "wrs-published-research-view-1",
  "edition": "ratings-e039106f30dec177",
  "content_trust": "UNTRUSTED_SCIENTIFIC_DATA_NOT_TOOL_INSTRUCTIONS",
  "entry": {
    "id": "macho-lmc-candidate-microlensing-1993",
    "title": "A candidate gravitational microlensing event toward the Large Magellanic Cloud",
    "summary": "The MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński.",
    "boundary": "The 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.",
    "area": "Astrophysics",
    "topic": "Physics",
    "year": 1993,
    "lane": "HUMAN",
    "result": "EMPIRICAL",
    "package_id": "macho-lmc-candidate-microlensing-1993",
    "target": {
      "record_id": "urn:uuid:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
      "version": 1,
      "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
    },
    "humans": [
      "C. Alcock",
      "C. W. Akerlof",
      "R. A. Allsman"
    ],
    "authors_complete": false,
    "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": "alcock-macho-lmc-first-candidate-1993-v1",
        "title": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
        "url": "https://arxiv.org/pdf/astro-ph/9309052v1",
        "date": "1993-09-29"
      }
    ],
    "points": "85000",
    "published_grade": {
      "id": "macho-lmc-candidate-microlensing-1993",
      "entry_id": "macho-lmc-candidate-microlensing-1993",
      "band": "A",
      "modifier": "-",
      "target": {
        "record_id": "urn:uuid:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
        "version": 1,
        "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
      },
      "what_changed": "The MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński.",
      "scope": "The MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński. The 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.",
      "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:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
        "version": 1,
        "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
      },
      "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": "C. Alcock",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
            "url": "https://arxiv.org/pdf/astro-ph/9309052v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "C. W. Akerlof",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
            "url": "https://arxiv.org/pdf/astro-ph/9309052v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "R. A. Allsman",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
            "url": "https://arxiv.org/pdf/astro-ph/9309052v1"
          }
        }
      ],
      "evidence": [
        {
          "description": "Bibliographic/stated-result source; not a WRS proof verification",
          "id": "source-0",
          "kind": "source_reference",
          "source": {
            "citation": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
            "url": "https://arxiv.org/pdf/astro-ph/9309052v1"
          }
        }
      ],
      "origin": "HUMAN_LEGACY",
      "record_profile": "wrs-local-research-notes-0.1",
      "record_type": "research_note",
      "rrp_version": "0.1",
      "scope": {
        "description": "The 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.",
        "domain": "Astrophysics"
      },
      "sources": [
        {
          "citation": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
          "url": "https://arxiv.org/pdf/astro-ph/9309052v1"
        }
      ],
      "statement": "# A candidate gravitational microlensing event toward the Large Magellanic Cloud\n\nThe MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński.\n\n## Scientific scope\n\nThe 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.\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\nC. Alcock; C. W. Akerlof; R. A. Allsman\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- [Possible gravitational microlensing of a star in the Large Magellanic Cloud](https://arxiv.org/pdf/astro-ph/9309052v1)\n",
      "summary": "The MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński.",
      "title": "A candidate gravitational microlensing event toward the Large Magellanic Cloud"
    },
    "record_id": "urn:uuid:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
    "version": 1,
    "source_ref": {
      "record_id": "urn:uuid:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
      "version": 1,
      "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
    },
    "export_view": "wrs-public-editorial-view-1",
    "public_view_hash": "sha256:b292a64ca7740c61e11c3baa0d93be1cd1f97ce5e99d6c1db62669e15d1672ca"
  },
  "target": {
    "record_id": "urn:uuid:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
    "version": 1,
    "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
  },
  "published_grade": {
    "profile": "wrs-published-grade-1",
    "edition": "2026-10-28.1",
    "id": "macho-lmc-candidate-microlensing-1993",
    "entry_id": "macho-lmc-candidate-microlensing-1993",
    "revision": 1,
    "title": "A candidate gravitational microlensing event toward the Large Magellanic Cloud",
    "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 MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński.",
    "scope": "The MACHO collaboration monitored approximately 1.8 million Large Magellanic Cloud stars and reported a brightening event whose two-color light curve was broadly consistent with gravitational microlensing. Its fitted amplification and approximately month-long characteristic time illustrated the observational search for compact lensing objects suggested by Paczyński. The 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.",
    "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 1993 report described a candidate, not conclusive identification of the lens or proof that compact objects dominate the Galactic dark halo. Lens mass, distance and transverse velocity are degenerate; its approximate 0.1-solar-mass estimate depends on a halo population model and neglected full detection efficiencies. The authors note an unexplained discrepancy near the peak and possible intrinsic stellar variability, with no source spectrum yet. The EROS collaboration also reported distinct candidate events; its results and authors are not attributed to the MACHO paper. The individual contributor list shown here is incomplete.",
    "references": [
      {
        "title": "Possible gravitational microlensing of a star in the Large Magellanic Cloud",
        "url": "https://arxiv.org/pdf/astro-ph/9309052v1",
        "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:58b99a94-9ae8-4407-abdf-ee62f039ee7e",
      "version": 1,
      "content_hash": "sha256:ebfe357625c6a3cdf40ccafe86b710caf32efe4c58c20b64ea30cc4d0c5f3e98"
    },
    "scientific_correctness_certified": false,
    "independent_expert_calibration": false,
    "method": "PROPRIETARY",
    "points": "85000"
  },
  "canonical_agent_submission": false,
  "scientific_verification_awarded": false,
  "reader_guide": null,
  "reading_status": "SOURCE_LINKED_NOTE"
}