Superevent Vo Event

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{
    "start": 0,
    "numRows": 4,
    "voevents": [
        {
            "voevent_type": "PR",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191216ap-1-Preliminary",
            "created": "2019-12-16 21:50:10 UTC",
            "issuer": "emfollow",
            "filename": "S191216ap-1-Preliminary.xml",
            "N": 1,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191216ap/voevents/1/",
                "file": "https://gracedb.ligo.org/api/superevents/S191216ap/files/S191216ap-1-Preliminary.xml,0"
            }
        },
        {
            "voevent_type": "IN",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191216ap-2-Initial",
            "created": "2019-12-16 21:57:53 UTC",
            "issuer": "emfollow",
            "filename": "S191216ap-2-Initial.xml",
            "N": 2,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191216ap/voevents/2/",
                "file": "https://gracedb.ligo.org/api/superevents/S191216ap/files/S191216ap-2-Initial.xml,0"
            }
        },
        {
            "voevent_type": "UP",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191216ap-3-Update",
            "created": "2019-12-19 17:55:16 UTC",
            "issuer": "emfollow",
            "filename": "S191216ap-3-Update.xml",
            "N": 3,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191216ap/voevents/3/",
                "file": "https://gracedb.ligo.org/api/superevents/S191216ap/files/S191216ap-3-Update.xml,0"
            }
        },
        {
            "voevent_type": "UP",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191216ap-4-Update",
            "created": "2019-12-23 18:01:58 UTC",
            "issuer": "emfollow",
            "filename": "S191216ap-4-Update.xml",
            "N": 4,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191216ap/voevents/4/",
                "file": "https://gracedb.ligo.org/api/superevents/S191216ap/files/S191216ap-4-Update.xml,0"
            }
        }
    ],
    "links": {
        "self": "http://gracedb.ligo.org/apiweb/superevents/S191216ap/voevents/",
        "first": "http://gracedb.ligo.org/apiweb/superevents/S191216ap/voevents/",
        "last": "http://gracedb.ligo.org/apiweb/superevents/S191216ap/voevents/"
    }
}