  We report new simultaneous near-infrared/sub-millimeter/X-ray observations of
the SgrA* counterpart associated with the massive 3-4x10**6 solar mass black
hole at the Galactic Center. The main aim is to investigate the physical
processes responsible for the variable emission from SgrA*. The observations
have been carried out using the NACO adaptive optics (AO) instrument at the
European Southern Observatory's Very Large Telescope and the ACIS-I instrument
aboard the Chandra X-ray Observatory as well as the Submillimeter Array SMA on
Mauna Kea, Hawaii, and the Very Large Array in New Mexico. We detected one
moderately bright flare event in the X-ray domain and 5 events at infrared
wavelengths.
