  An improved measurement of the mass of the Higgs boson is derived from a
combined fit to the invariant mass spectra of the decay channels $H\rightarrow
\gamma\gamma$ and $H \rightarrow ZZ^{*} \rightarrow 4\ell$. The analysis uses
the $pp$ collision data sample recorded by the ATLAS experiment at the CERN
Large Hadron Collider at center-of-mass energies of 7 TeV and 8 TeV,
corresponding to an integrated luminosity of 25 fb$^{-1}$. The measured value
of the Higgs boson mass is $m_H$ = 125.36 $\pm$ 0.37 (stat) $\pm$ 0.18 (syst)
GeV. This result is based on improved energy-scale calibrations for photons,
electrons, and muons as well as other analysis improvements, and supersedes the
previous result from ATLAS. Upper limits on the total width of the Higgs boson
are derived from fits to the invariant mass spectra of the $H\rightarrow
\gamma\gamma$ and $H \rightarrow ZZ^{*} \rightarrow 4\ell$ decay channels.
