GCN Alert: Messaggio GCN inviato alle 2025-06-23 02:34:31: S250623d Most probable sky…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-06-23T00:34:30Z",
    "superevent_id": "S250623d",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/S250623d/view/"
    },
    "event": {
        "significant": false,
        "time": "2025-06-23T00:27:19.094Z",
        "far": 1.73132e-5,
        "instruments": [
            "H1",
            "L1"
        ],
        "group": "CBC",
        "pipeline": "CWB",
        "search": "BBH",
        "properties": {
            "HasNS": 0,
            "HasRemnant": 0,
            "HasMassGap": 0.005275362318840579
        },
        "classification": {
            "Terrestrial": 0.998727374936457,
            "BNS": 0,
            "BBH": 0.0012726250635429759,
            "NSBH": 0
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": null
}