APEX sub-mm monitoring of gamma-ray blazars
  So far, no systematic long-term blazar monitoring programs and detailed variability studies exist at sub-mm wavelengths. Here, we present a new sub-mm blazar monitoring program using the APEX 12-m telescope. A sample of about 40 gamma-ray blazars has been monitored since 2007/2008 with the LABOCA bolometer camera at 345 GHz. First light curves, preliminary variability results and a first comparison with the longer cm/mm bands (F-GAMMA program) are presented, demonstrating the extreme variability characteristics of blazars at such short wavelengths. 
S. Larsson, L. Fuhrmann, A. Weiss, E. Angelakis, T. P. Krichbaum, I.   Nestoras, J. A. Zensus, M. Axelsson, D. Nilsson, F. R...
astro-ph.HE