The 2011A OT was released on December 2, 2010. The most significant changes from the previous version (2010B) are summarized below:

• Check that the band-3 minimum time is not zero
• Add support for new NICI components
• Add phase 2 check when the GMOS OIWFS guide star is not reachable
• Improve the visualization of GMOS OIWFS offsets
  • FoV reachable by all offset positions marked in green
  • Unreachable offsets marked in red
• Fix NIFS minimum exposure time error
• Update GNIRS image readout overheads
• Fix several OT orbital element bugs
• Fix observing wavelength in nested iterators
• Remove Hipparcos coordinate system.
• Add support for GNIRS ND filter
• Fix GMOS N&S binning bug
• Include GNIRS Read Mode in iterator
• Make GNIRS Camera an engineering component
• Fix non-sidereal target 'Now' button
• Fix GNIRS FOV visualization for all XD combinations
• Make GMOS-N amp count an engineering-only property
• GSAOI updates
  • Configurable GSAOI orientation
  • Component updates
  • Update default values for ADC, dichroic and astrometric mode
  • ODGW guide options