GCN Alert: Messaggio GCN inviato alle 2026-04-28 06:09:36:

{
    "alert_type": "RETRACTION",
    "time_created": "2026-04-28T04:09:35Z",
    "superevent_id": "MS260428d",
    "urls": {
        "gracedb": "https://gracedb.ligo.org/superevents/MS260428d/view/"
    },
    "event": null,
    "external_coinc": null
}