GCN Alert: Messaggio GCN inviato alle 2025-08-20 09:40:37:S250820am Most probable sky location…

{
    "alert_type": "PRELIMINARY",
    "time_created": "2025-08-20T07:40:35Z",
    "superevent_id": "S250820am",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/S250820am/view/"
    },
    "event": {
        "significant": false,
        "time": "2025-08-20T07:34:27.285Z",
        "far": 7.30138e-6,
        "instruments": [
            "H1",
            "L1"
        ],
        "group": "CBC",
        "pipeline": "CWB",
        "search": "BBH",
        "properties": {
            "HasNS": 0,
            "HasRemnant": 0,
            "HasMassGap": 0.005275362318840579
        },
        "classification": {
            "Terrestrial": 0.9952207936301758,
            "BNS": 0,
            "BBH": 0.004779206369824207,
            "NSBH": 0
        },
        "duration": null,
        "central_frequency": null
    },
    "external_coinc": null
}