  We carried out photometric observations for HBC 722 in SDSS r, i and z bands
from 2011 April to 2013 May with a Camera for Quasars in Early uNiverse
attached to the 2.1m Otto Struve telescope at McDonald Observatory. The
post-outburst phenomena were classified into five phases according to not only
brightness but also color variations, which might be caused by physical changes
in the emitting regions of optical and near-infrared bands. A series of
spectral energy distribution (SED) is presented to support color variations and
track the time evolution of SED in optical/near-infrared bands after the
outburst. Given two years of data, possible periodicities of r, i and z bands
were checked. We found out three families of signals around ~6, ~10 and ~1 days
in three bands, which is broadly consistent with Green et al. (2013). We also
examined short term variability (intra-day and day scales) to search for
evidences of flickering by using the micro-variability method. We found clear
signs of day scale variability and weak indications of intra-day scale
fluctuations, which implies that the flickering event occurs in HBC 722 after
outburst.
