Observation and Confirmation of Six Strong Lensing Systems in The Dark
  Energy Survey Science Verification Data
  We report the observation and confirmation of the first group- and
cluster-scale strong gravitational lensing systems found in Dark Energy Survey
(DES) data. Through visual inspection of data from the Science Verification
(SV) season, we identified 53 candidate systems. We then obtained spectroscopic
follow-up of 21 candidates using the Gemini Multi-Object Spectrograph (GMOS) at
the Gemini South telescope and the Inamori-Magellan Areal Camera and
Spectrograph (IMACS) at the Magellan/Baade telescope. With this follow-up, we
confirmed six candidates as gravitational lenses: Three of the systems are
newly discovered, and the remaining three were previously known. Of the 21
observed candidates, the remaining 15 were either not detected in spectroscopic
observations, were observed and did not exhibit continuum emission (or spectral
features), or were ruled out as lensing systems. The confirmed sample consists
of one group-scale and five galaxy cluster-scale lenses. The lensed sources
range in redshift z ~ 0.80-3.2, and in i-band surface brightness i_{SB} ~ 23-25
mag/sq.-arcsec. (2" aperture). For each of the six systems, we estimate the
Einstein radius and the enclosed mass, which have ranges ~ 5.0 - 8.6" and ~ 7.5
x 10^{12} - 6.4 x 10^{13} solar masses, respectively.
