GCN Alert: Messaggio GCN inviato alle 2025-12-18 22:03:50:MS251218u Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-12-18T21:03:42Z",
    "superevent_id": "MS251218u",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS251218u/view/"
    },
    "event": {
        "significant": true,
        "time": "2025-12-18T20:58:20.859Z",
        "far": 9.110699364861297e-14,
        "instruments": [
            "H1",
            "L1"
        ],
        "group": "CBC",
        "pipeline": "gstlal",
        "search": "MDC",
        "properties": {
            "HasNS": 1,
            "HasRemnant": 1,
            "HasMassGap": 0
        },
        "classification": {
            "BNS": 0.9999922920485548,
            "NSBH": 0,
            "BBH": 0,
            "Terrestrial": 7.707951445262751e-6
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": null
}