A Large--Scale Spectroscopic Survey of Methanol and OH Line Emission
  from the Galactic Center: Observations and Data
  Class I methanol masers are collisionally pumped and are generally correlated
with outflows in star forming sites in the Galaxy. Using the VLA in its A-array
configuration, we present a spectral line survey to identify methanol
$J=4_{-1}\rightarrow3_0E$ emission at 36.169~GHz. Over 900 pointings were used
to cover a region 66'x13'along the inner Galactic plane. A shallow survey of OH
at 1612, 1665, 1667 and 1720 MHz was also carried out over the area covered by
our methanol survey. We provide a catalog of 2240 methanol masers with narrow
line-widths of $\sim1$ km s$^{-1}$, spatial resolution of ~0.14"x0.05" and RMS
noise $\sim20$ mJy beam$^{-1}$ per channel. Lower limits on the brightness
temperature range from 27,000 K to 10,000,000 K showing the emission is of
non-thermal origin. We also provide a list of 23 OH (1612), 14 OH (1665), 5 OH
(1667) and 5 OH(1720 MHz) masers. The origin of such a large number of methanol
masers is not clear. Many methanol masers appear to be associated with infrared
dark clouds, though it appears unlikely that the entire population of masers
trace early phase of star formation in the Galactic center.
