(Sub)-millimetre Observations of MAXI J1820+070 (ASASSN-18ey) Suggest Jet Quenching on July 6

Following the report of a hard to soft accretion state transition (ATel #11820) in the currently outbursting candidate black hole X-ray binary, MAXI J1820+070 (ATel #11399, #11400, #11404, #11406, #11418, #11420, #11440), we performed target-of-opportunity observations with the Atacama Large Millimeter/Submillimeter Array (ALMA) and the Submillimeter Array (SMA).