  A measurement of W-gamma and Z-gamma production in proton-proton collisions
at sqrt(s) = 7 TeV is presented. Results are based on a data sample recorded by
the CMS experiment at the LHC, corresponding to an integrated luminosity of 36
inverse picobarns. The electron and muon decay channels of the W and Z are
used. The total cross sections are measured for photon transverse energy >10
GeV and spatial separation from charged leptons in the plane of pseudorapidity
and azimuthal angle >0.7, and with an additional dilepton invariant mass
requirement of > 50 GeV for the Z-gamma process. The following cross section
times branching fraction values are found: sigma(pp to W-gamma+X) B(W to lepton
neutrino) = 56.3 +/- 5.0 (stat.) +/- 5.0 (syst.) +/- 2.3 (lumi.) pb and
sigma(pp to Z-gamma+X) B}(Z to lepton lepton) = 9.4 +/- 1.0 (stat.) +/- 0.6
(syst.) +/- 0.4 (lumi.) pb. These measurements are in agreement with standard
model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z
gamma gamma trilinear gauge couplings at sqrt(s) = 7 TeV are set.
