Superevent Vo Event

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            "created": "2019-12-13 16:02:06 UTC",
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            "created": "2019-12-13 16:07:58 UTC",
            "issuer": "emfollow",
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            "ivorn": "ivo://gwnet/LVC#S191213ai-3-Retraction",
            "created": "2019-12-13 16:35:39 UTC",
            "issuer": "emfollow",
            "filename": "S191213ai-3-Retraction.xml",
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        "last": "http://gracedb.ligo.org/apiweb/superevents/S191213ai/voevents/"
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