GCN Alert: Messaggio GCN inviato alle 2025-12-21 13:13:37:

{
    "alert_type": "RETRACTION",
    "time_created": "2025-12-21T12:13:37Z",
    "superevent_id": "MS251221l",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS251221l/view/"
    },
    "event": null,
    "external_coinc": null
}