GCN Alert: Messaggio GCN inviato alle 2026-03-22 10:57:31:MS260322j Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2026-03-22T09:57:23Z",
    "superevent_id": "MS260322j",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS260322j/view/"
    },
    "event": {
        "significant": true,
        "time": "2026-03-22T09:41:14.328Z",
        "far": 5.176954877338635e-16,
        "instruments": [
            "H1",
            "L1",
            "V1"
        ],
        "group": "CBC",
        "pipeline": "gstlal",
        "search": "MDC",
        "properties": {
            "HasNS": 1,
            "HasRemnant": 1,
            "HasMassGap": 0
        },
        "classification": {
            "BNS": 0.9999992144385029,
            "NSBH": 0,
            "BBH": 0,
            "Terrestrial": 7.855614969719482e-7
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": {
        "gcn_notice_id": 1458207691,
        "ivorn": "ivo://lvk.internal/Fermi#MDC-test_event_2026-03-22T09:41:13.603Z",
        "observatory": "Fermi",
        "search": "MDC",
        "time_difference": -0.72,
        "time_coincidence_far": 3.201123164260001e-20,
        "time_sky_position_coincidence_far": 1.0649046444140185e-18
    }
}