We discuss the latest results of the AURIGA gravitational wave detector at the INFN National Laboratories of Legnaro, Italy. AURIGA is an ultracryogenic resonant bar detector, whose design is similar to the other INFN ultracryogenic detector NAUTILUS. The first cryogenic run of AURIGA is currently in progress. During these first months of operation we tested the performances of the cryogenics, of the mechanical suspensions and of the data acquisition system. The transducer output has been monitored through a room temperature port either to calibrate the detector or to measure the antenna noise. Here we present preliminary results on calibration and diagnostic of the antenna at liquid helium temperatures. In particular, the antenna noise performance has been thermal over a long time span at about 6K.
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