GCN Alert: Messaggio GCN inviato alle 2025-12-21 13:03:50:MS251221l Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-12-21T12:03:43Z",
    "superevent_id": "MS251221l",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS251221l/view/"
    },
    "event": {
        "significant": true,
        "time": "2025-12-21T11:58:29.635Z",
        "far": 9.110699364861297e-14,
        "instruments": [
            "H1",
            "L1"
        ],
        "group": "CBC",
        "pipeline": "gstlal",
        "search": "MDC",
        "properties": {
            "HasNS": 1,
            "HasRemnant": 1,
            "HasMassGap": 0
        },
        "classification": {
            "BNS": 0.9999975024662306,
            "NSBH": 0,
            "BBH": 0,
            "Terrestrial": 2.497533769387084e-6
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": null
}