Discrete correlation function computed between the VHE gamma-ray fluxes above 0.2 TeV, as measured by MAGIC and VERITAS, and the HE gamma-ray fluxes measured by Fermi-LAT. The DCF is computed using a time bin of 3-days for a range of time lags between -40 to +40 days. The 1 σ, 2 σ, and 3 σ confidence levels obtained by simulations are shown by the yellow, red, and green lines, respectively. (a) > 0.2 TeV versus 3-300 GeV; (b) > 0.2 TeV versus 3-300 GeV without the flare in February 2010; (c) > 0.2 TeV versus 0.3-3 GeV; (d) > 0.2 TeV versus 0.3-3 GeV without the flare in February 2010.