Superevent Vo Event

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{
    "voevent_type": "UP",
    "file_version": 0,
    "ivorn": "ivo://gwnet/LVC#S190828j-4-Update",
    "created": "2019-09-29 06:36:18 UTC",
    "issuer": "emfollow",
    "filename": "S190828j-4-Update.xml",
    "N": 4,
    "links": {
        "file": "https://gracedb.ligo.org/api/superevents/S190828j/files/S190828j-4-Update.xml,0",
        "self": "https://gracedb.ligo.org/api/superevents/S190828j/voevents/4/"
    }
}