  The ultrahigh-energy cosmic-ray anisotropies discovered by the Pierre Auger
Observatory give the potential to finally address both the particles' origins
and properties of the nearby extragalactic magnetic field (EGMF). We examine
the implications of the excess of ~ 10^20 eV events around the nearby radio
galaxy Centaurus A. We find that, if Cen A is the source of these cosmic rays,
the angular distribution of events constrains the EGMF strength within several
Mpc of the Milky Way to > 20 nG for an assumed primary proton composition. Our
conclusions suggest that either the observed excess is a statistical anomaly or
the local EGMF is stronger then conventionally thought. We discuss the
implications of this field, including UHECR scattering from more distant
sources, time delays from transient sources, and the possibility of using
magnetic lensing signatures to attain tighter constraints.
