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You are here: Home Telescopes Magellan Instruments IMACS Making and Submitting IMACS SlitMasks How to Submit IMACS Mask Files

How to Submit IMACS Mask Files

Users must submit their mask files using the LCO on-line Slit Mask Manager. For regular IMACS masks, it is only necessary to submit the .SMF files created by the task "maskgen". Please do not use any form of compression on the uploaded files. For GISMO masks, please prepare the final .nc file and upload at the GISMO Slit Mask Manager.

You can monitor the status of your masks using the mask DATABASE. For GISMO masks please use the GISMO DATABASE.

Instructions for designing masks and downloading software to do this are found here.  Click here to read about an important change in N&S mask design.


  • All slit mask files must be submitted at least 6 weeks in advance of an observing run.
  • David Osip must give permission for files to be submitted between 3-6 weeks before a run. We cannot guarantee that masks will be cut in this interval.
  • NO masks will be cut less than 3 weeks before the deadline.


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