  We present upper limits in the hard X-ray and gamma-ray bands at the time of
the LIGO gravitational-wave event GW 151226 derived from the CALorimetric
Electron Telescope (CALET) observation. The main instrument of CALET,
CALorimeter (CAL), observes gamma-rays from ~1 GeV up to 10 TeV with a field of
view of ~2 sr. The CALET gamma-ray burst monitor (CGBM) views ~3 sr and ~2pi sr
of the sky in the 7 keV - 1 MeV and the 40 keV - 20 MeV bands, respectively, by
using two different scintillator-based instruments. The CGBM covered 32.5% and
49.1% of the GW 151226 sky localization probability in the 7 keV - 1 MeV and 40
keV - 20 MeV bands respectively. We place a 90% upper limit of 2 x 10^{-7} erg
cm-2 s-1 in the 1 - 100 GeV band where CAL reaches 15% of the integrated LIGO
probability (~1.1 sr). The CGBM 7 sigma upper limits are 1.0 x 10^{-6} erg cm-2
s-1 (7-500 keV) and 1.8 x 10^{-6} erg cm-2 s-1 (50-1000 keV) for one second
exposure. Those upper limits correspond to the luminosity of 3-5 x 10^{49} erg
s-1 which is significantly lower than typical short GRBs.
