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So far, no systematic long-term blazar monitoring programs and detailedvariability studies exist at sub-mm wavelengths. Here, we present a new sub-mmblazar monitoring program using the APEX 12-m telescope. A sample of about 40gamma-ray blazars has been monitored since 2007/2008 with the LABOCA bolometercamera at 345 GHz. First light curves, preliminary variability results and afirst comparison with the longer cm/mm bands (F-GAMMA program) are presented,demonstrating the extreme variability characteristics of blazars at such shortwavelengths.

APEX sub-mm monitoring of gamma-ray blazars