{
  "object": "OGLE-LMC-RRLYR-00001",
  "subtype": "RRab",
  "survey": "OGLE-IV Collection of Variable Stars, LMC RR Lyrae",
  "source_url": "https://www.astrouw.edu.pl/ogle/ogle4/OCVS/lmc/rrlyr/phot/I/OGLE-LMC-RRLYR-00001.dat",
  "retrieved_utc": "2026-10-28",
  "last_modified": "2017-06-29T14:33:18Z",
  "etag": "25c8-5531a2e80c780",
  "source_bytes": 9672,
  "source_sha256": "6d6bb05178881e421ca2c03cf77bc100d51f74c87efbd523a9f017216c6e5a1b",
  "source_rows": 403,
  "source_columns": ["Heliocentric Julian Day minus 2450000, days", "OGLE I-band magnitude, mag", "quoted magnitude uncertainty, mag"],
  "source_time_span_days": 2232.9716499999995,
  "time_system_scope": "Archive HJD as stated; do not relabel BJD or infer TDB/UTC from this three-column file.",
  "quality": "Original values/errors retained. Source file has no separate quality flags. Replay requires finite values and positive quoted sigma; no clipping or model substitution.",
  "tutorial_selection": "All finite positive-sigma rows within 160 days of the first point. Actual selected span 51.96797 days and 25 samples; next season is outside selection. Every-third comparison retains nine of these actual rows.",
  "readme_url": "https://www.astrouw.edu.pl/ogle/ogle4/OCVS/lmc/rrlyr/README",
  "readme_sha256": "b318eddab82c9af0214186851d906acceb4c7b344dbcdd919a5cc901691d4765",
  "readme_last_modified": "2023-09-25T21:06:23Z",
  "catalog_row_source": "https://www.astrouw.edu.pl/ogle/ogle4/OCVS/lmc/rrlyr/RRab.dat",
  "catalog_row_retrieval": "HTTP 206 first 16384 bytes only; selected matching object row saved independently.",
  "catalog_first_16384_bytes_sha256": "21a1aaab12aba67bd398ab3be8571adac463e2b3fd35b008bffb1d725d5959a5",
  "catalog_period_days": 0.6347521,
  "catalog_period_sigma_days": 0.0000010,
  "catalog_precision_scope": "Published catalog uncertainty uses the survey analysis, not this short single-harmonic tutorial. The tutorial frequency grid and model cannot reproduce that precision.",
  "permission": "Public survey download. Official README requests appropriate OGLE paper citation for analysis/usage. No explicit CC0 or CC-BY grant located; do not assert one. The LMC README's acknowledgement paragraph says Galactic bulge, apparently copied boilerplate; cite the LMC catalog and updates appropriate to these data.",
  "acknowledgement": "OGLE collaboration; Soszynski et al. (2016), Acta Astronomica 66,131, arXiv:1606.02727; Soszynski et al. (2017), Acta Astronomica 67,103, arXiv:1706.09452.",
  "synthetic_boundary": "Browser two-source exposures, Gaussian-null calibration, and sinusoidal injections are separately labeled synthetic. The archived magnitudes remain measured.",
  "software": "Independently authored weighted-QR replay using numpy 2.0.2. No package files changed. Full frequency grid, all random seeds, null maxima, validation rate, permutation result, and injection outcomes saved."
}