Superevent Vo Event

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            "created": "2019-12-04 17:58:26 UTC",
            "issuer": "emfollow",
            "filename": "S191204r-1-Preliminary.xml",
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            "voevent_type": "PR",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191204r-2-Preliminary",
            "created": "2019-12-04 18:10:26 UTC",
            "issuer": "emfollow",
            "filename": "S191204r-2-Preliminary.xml",
            "N": 2,
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            "voevent_type": "PR",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191204r-3-Preliminary",
            "created": "2019-12-04 18:16:43 UTC",
            "issuer": "emfollow",
            "filename": "S191204r-3-Preliminary.xml",
            "N": 3,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191204r/voevents/3/",
                "file": "https://gracedb.ligo.org/api/superevents/S191204r/files/S191204r-3-Preliminary.xml,0"
            }
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        {
            "voevent_type": "IN",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S191204r-4-Initial",
            "created": "2019-12-04 18:19:28 UTC",
            "issuer": "emfollow",
            "filename": "S191204r-4-Initial.xml",
            "N": 4,
            "links": {
                "self": "https://gracedb.ligo.org/api/superevents/S191204r/voevents/4/",
                "file": "https://gracedb.ligo.org/api/superevents/S191204r/files/S191204r-4-Initial.xml,0"
            }
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}