GCN Alert: Messaggio GCN inviato alle 2025-12-17 10:03:52:MS251217j Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-12-17T09:03:46Z",
    "superevent_id": "MS251217j",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS251217j/view/"
    },
    "event": {
        "significant": true,
        "time": "2025-12-17T08:51:10.196Z",
        "far": 1.376395772103063e-13,
        "instruments": [
            "L1",
            "V1"
        ],
        "group": "CBC",
        "pipeline": "gstlal",
        "search": "MDC",
        "properties": {
            "HasNS": 1,
            "HasRemnant": 1,
            "HasMassGap": 0
        },
        "classification": {
            "BNS": 0.9999869580748139,
            "NSBH": 0,
            "BBH": 0,
            "Terrestrial": 1.3041925186075222e-5
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": {
        "gcn_notice_id": 1449996690,
        "ivorn": "ivo://lvk.internal/fsc#MDC-test_event_2025-12-17T08:51:12.279Z",
        "observatory": "SVOM",
        "search": "MDC",
        "time_difference": 2.08,
        "time_coincidence_far": 8.51081860604063e-18,
        "time_sky_position_coincidence_far": 3.218623355374981e-17
    }
}