{
    "event_id": "S251021u",
    "alert_type": "UPDATE",
    "event_time": "2025-10-21 03:22:15",
    "before_fromdate": "2025-09-21 03:22:15",
    "before_todate": "2025-10-21 03:22:15",
    "after_fromdate": "2025-10-21 03:22:15",
    "after_todate": "2025-11-04 03:22:15",
    "last_processed_datetime": "2025-11-04 03:31:36",
    "public": "1",
    "zip_file": "S251021u_20251021_032215.zip",
    "current_json": "S251021u_20251021_032215.json",
    "json_object_list_before": "S251021u_20251021_032215_BEFORE.json",
    "json_object_list_after": "S251021u_20251021_032215_AFTER.json",
    "tsv_object_list_before": "S251021u_20251021_032215_BEFORE.tsv",
    "tsv_object_list_after": "S251021u_20251021_032215_AFTER.tsv",
    "png_object_list_before": "S251021u_20251021_032215_BEFORE.png",
    "png_object_list_after": "S251021u_20251021_032215_AFTER.png",
    "event_page": "https://gracedb.ligo.org/superevents/S251021u/view/",
    "instruments": "H1, L1",
    "far": "2.217282089570696e-09",
    "group": "CBC",
    "skymap_fits": "S251021u_20251021_032215.fits",
    "prob_bns": "0.0",
    "prob_nsbh": "0.0",
    "prob_bbh": "0.9999181305392698",
    "prob_mass_gap": "0.0",
    "prob_terrestrial": "8.186946073018841e-05",
    "prob_has_ns": "0.0",
    "prob_has_remnant": "0.0",
    "prob_has_ssm": "",
    "distmean": "5884.293522557986",
    "diststd": "2088.9314305917046",
    "significance": "high"
}