Superevent Vo Event

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            "file_version": 0,
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            "created": "2020-01-16 11:58:55 UTC",
            "issuer": "emfollow",
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            "created": "2020-01-16 12:04:59 UTC",
            "issuer": "emfollow",
            "filename": "S200116ah-2-Preliminary.xml",
            "N": 2,
            "links": {
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            "voevent_type": "RE",
            "file_version": 0,
            "ivorn": "ivo://gwnet/LVC#S200116ah-3-Retraction",
            "created": "2020-01-16 12:17:15 UTC",
            "issuer": "emfollow",
            "filename": "S200116ah-3-Retraction.xml",
            "N": 3,
            "links": {
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        "last": "http://gracedb.ligo.org/apiweb/superevents/S200116ah/voevents/"
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}