  At the center of the Milky Way, with a distance of ~8 kpc, the compact source
Sagittarius A* (SgrA*) can be associated with a super massive black hole of
~4x10^6 solar masses. SgrA* shows strong variability from the radio to the
X-ray wavelength domains. Here we report on simultaneous
NIR/sub-millimeter/X-ray observations from May 2007 that involved the NACO
adaptive optics (AO) instrument at the European Southern Observatory's Very
Large Telescope, the Australian Telescope Compact Array (ATCA), the US mm-array
CARMA, the IRAM 30m mm-telescope, and other telescopes. We concentrate on the
time series of mm/sub-mm data from CARMA, ATCA, and the MAMBO bolometer at the
IRAM 30m telescope.
