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In May 2007 the compact radio source Sgr A* was observed in a globalmulti-frequency monitoring campaign, from radio to X-ray bands. Here we presentand discuss first and preliminary results from polarization sensitive VLBAobservations, which took place during May 14-25, 2007. Here, Sgr A* wasobserved in dual polarization on 10 consecutive days at 22, 43, and 86 GHz. Wedescribe the VLBI experiments, our data analysis, monitoring program and showpreliminary images obtained at the various frequencies. We discuss the datawith special regard also to the short term variability.

High-frequency VLBI observations of SgrA* during a multi-frequency campaign in May 2007