Superevent Vo Event

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{
    "start": 0,
    "numRows": 4,
    "voevents": [
        {
            "voevent_type": "PR",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S190828j-1-Preliminary",
            "created": "2019-08-28 06:50:11 UTC",
            "issuer": "emfollow",
            "filename": "S190828j-1-Preliminary.xml",
            "N": 1,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S190828j/voevents/1/",
                "file": "https://gracedb.ligo.org/api/superevents/S190828j/files/S190828j-1-Preliminary.xml,0"
            }
        },
        {
            "voevent_type": "IN",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S190828j-2-Initial",
            "created": "2019-08-28 06:59:47 UTC",
            "issuer": "emfollow",
            "filename": "S190828j-2-Initial.xml",
            "N": 2,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S190828j/voevents/2/",
                "file": "https://gracedb.ligo.org/api/superevents/S190828j/files/S190828j-2-Initial.xml,0"
            }
        },
        {
            "voevent_type": "UP",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S190828j-3-Update",
            "created": "2019-08-28 08:07:47 UTC",
            "issuer": "emfollow",
            "filename": "S190828j-3-Update.xml",
            "N": 3,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S190828j/voevents/3/",
                "file": "https://gracedb.ligo.org/api/superevents/S190828j/files/S190828j-3-Update.xml,0"
            }
        },
        {
            "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": {
                "self": "https://gracedb.ligo.org/api/superevents/S190828j/voevents/4/",
                "file": "https://gracedb.ligo.org/api/superevents/S190828j/files/S190828j-4-Update.xml,0"
            }
        }
    ],
    "links": {
        "self": "http://gracedb.ligo.org/apiweb/superevents/S190828j/voevents/",
        "first": "http://gracedb.ligo.org/apiweb/superevents/S190828j/voevents/",
        "last": "http://gracedb.ligo.org/apiweb/superevents/S190828j/voevents/"
    }
}