00418nas a2200157   4500000000100000000000100001008004100002100001500043700001800058700001600076700001900092700001400111245012000125300000700245490000800252       2017                            d1 aF. Roelofs1 aM. D. Johnson1 aH. Shiokawa1 aS. S. Doeleman1 aH. Falcke00aQuantifying Intrinsic Variability of Sagittarius A* Using Closure Phase Measurements of the Event Horizon Telescope  a190 v847