GCN Alert: Messaggio GCN inviato alle 2025-12-17 16:03:56:MS251217p Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-12-17T15:03:49Z",
    "superevent_id": "MS251217p",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS251217p/view/"
    },
    "event": {
        "significant": true,
        "time": "2025-12-17T14:54:14.625Z",
        "far": 5.176954877338635e-16,
        "instruments": [
            "H1",
            "L1",
            "V1"
        ],
        "group": "CBC",
        "pipeline": "gstlal",
        "search": "MDC",
        "properties": {
            "HasNS": 1,
            "HasRemnant": 1,
            "HasMassGap": 0
        },
        "classification": {
            "BNS": 0.9999999520816664,
            "NSBH": 0,
            "BBH": 0,
            "Terrestrial": 4.7918333650571195e-8
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": {
        "gcn_notice_id": 1450018475,
        "ivorn": "ivo://lvk.internal/fsc#MDC-test_event_2025-12-17T14:54:17.704Z",
        "observatory": "SVOM",
        "search": "MDC",
        "time_difference": 3.08,
        "time_coincidence_far": 3.201123164260001e-20,
        "time_sky_position_coincidence_far": 4.318812769788183e-18
    }
}