GROND - a 7-channel imager
  We describe the construction of GROND, a 7-channel imager, primarily designed for rapid observations of gamma-ray burst afterglows. It allows simultaneous imaging in the Sloan g'r'i'z' and near-infrared $JHK$ bands. GROND was commissioned at the MPI/ESO 2.2m telescope at La Silla (Chile) in April 2007, and first results of its performance and calibration are presented. 
J. Greiner, W. Bornemann, C. Clemens, M. Deuter, G. Hasinger, M.   Honsberg, H. Huber, S. Huber, M. Krauss, T. Kr\"uhler, A....