Seven-Year Multi-Color Optical Monitoring of BL Lacertae Object S5
  0716+714
  We have monitored the BL Lac object S5 0716+714 in five intermediate optical
wavebands from 2004 September to 2011 April. Here we present the data that
include 8661 measurements which represents one of the largest databases
obtained for an object at optical domain. A simple analysis of the data
indicates that the object was active in most time, and intraday variability was
frequently observed. In total, the object varied by 2.614 magnitudes in the $i$
band. Strong bluer-when-brighter chromatism was observed on long, intermediate,
and short timescales.
