The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations
  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. 
A. Eckart, F. K. Baganoff, R. Schoedel, M. Morris, R. Genzel, G.C.   Bower, D. Marrone, J.M. Moran, T. Viehmann, M.W. Bautz,...