GCN Alert: Messaggio GCN inviato alle 2026-07-21 00:13:34:

{
    "alert_type": "RETRACTION",
    "time_created": "2026-07-20T22:13:34Z",
    "superevent_id": "MS260720v",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS260720v/view/"
    },
    "event": null,
    "external_coinc": null
}