Superevent Vo Event

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            "file_version": 0,
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            "created": "2019-12-15 22:38:24 UTC",
            "issuer": "emfollow",
            "filename": "S191215w-1-Preliminary.xml",
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        {
            "voevent_type": "PR",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191215w-2-Preliminary",
            "created": "2019-12-15 22:46:00 UTC",
            "issuer": "emfollow",
            "filename": "S191215w-2-Preliminary.xml",
            "N": 2,
            "links": {
                "file": "https://gracedb.ligo.org/api/superevents/S191215w/files/S191215w-2-Preliminary.xml,0",
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        {
            "voevent_type": "IN",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191215w-3-Initial",
            "created": "2019-12-15 22:49:49 UTC",
            "issuer": "emfollow",
            "filename": "S191215w-3-Initial.xml",
            "N": 3,
            "links": {
                "file": "https://gracedb.ligo.org/api/superevents/S191215w/files/S191215w-3-Initial.xml,0",
                "self": "https://gracedb.ligo.org/api/superevents/S191215w/voevents/3/"
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        },
        {
            "voevent_type": "UP",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191215w-4-Update",
            "created": "2019-12-20 15:52:45 UTC",
            "issuer": "emfollow",
            "filename": "S191215w-4-Update.xml",
            "N": 4,
            "links": {
                "file": "https://gracedb.ligo.org/api/superevents/S191215w/files/S191215w-4-Update.xml,0",
                "self": "https://gracedb.ligo.org/api/superevents/S191215w/voevents/4/"
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    ],
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        "last": "http://gracedb.ligo.org/apiweb/superevents/S191215w/voevents/"
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}