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We use weak gravitational lensing to measure the masses of five galaxyclusters selected from the South Pole Telescope (SPT) survey, with the primarygoal of comparing these with the SPT Sunyaev--Zel'dovich (SZ) and X-ray basedmass estimates. The clusters span redshifts 0.28 < z < 0.43 and have massesM_500 > 2 x 10^14 h^-1 M_sun, and three of the five clusters were discovered bythe SPT survey. We observed the clusters in the g'r'i' passbands with theMegacam imager on the Magellan Clay 6.5m telescope. We measure a mean ratio ofweak lensing (WL) aperture masses to inferred aperture masses from the SZ data,both within an aperture of R_500,SZ derived from the SZ mass, of 1.04 +/- 0.18.We measure a mean ratio of spherical WL masses evaluated at R_500,SZ tospherical SZ masses of 1.07 +/- 0.18, and a mean ratio of spherical WL massesevaluated at R_500,WL to spherical SZ masses of 1.10 +/- 0.24. We explorepotential sources of systematic error in the mass comparisons and conclude thatall are subdominant to the statistical uncertainty, with dominant terms beingcluster concentration uncertainty and N-body simulation calibration bias.Expanding the sample of SPT clusters with WL observations has the potential tosignificantly improve the SPT cluster mass calibration and the resultingcosmological constraints from the SPT cluster survey. These are the first WLdetections using Megacam on the Magellan Clay telescope.

Weak-Lensing Mass Measurements of Five Galaxy Clusters in the South Pole Telescope Survey Using Magellan/Megacam