Seoul National University Radio Astronomy Observatory (SRAO), a 6-meter single-dish telescope recently applied new 100GHz and 230GHz dual-band receiver. The SRAO had been inactive for several years, but resumed operation by adapting the Combined Array for Research in Millimeter-wave Astronomy (CARMA) receiver. We succeeded in the single-dish observations in 2019 March. We upgraded the SRAO to the mm-VLBI station and participated in the test observation of East Asia VLBI Network (EAVN) with several telescopes worldwide. The simultaneous single dish and VLBI observation is possible. We are going to design the new receiver and import a wideband 230GHz mixer and have a VLBI observation with Korean VLBI Network (KVN). Also, we are planning to test the phase reference technique between 100Ghz and 230GHz.
The Greenland Telescope completed its construction, so the commissioning phase has been started since December 2017. Single-dish commissioning has started from the optical pointing which produced the first pointing model, followed by the radio pointing and focusing using the Moon for both the 86 GHz and the 230 GHz receivers. After Venus started to rise from the horizon, the focus positions has been improved for both receivers. Once we started the line pointing using the SiO(2-1) maser line and the CO(2-1) line for the 86 GHz and the 230 GHz receivers, respectively, the pointing accuracy also improved, and the final pointing accuracy turned to be around 3" - 5" for both receivers. In parallel, VLBI commissioning has been performed, with checking the frequency accuracy and the phase stability for all the components that would be used for the VLBI observations. After all the checks, we successfully joined the dress rehearsals and actual observations of the 86 GHz and 230 GHz VLBI observations, The first dress rehearsal data between GLT and ALMA were correlated, and successfully detected the first fringe, which confirmed that the GLT commissioning was successfully performed.
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