A suite of flatfield and arc-lamp (CuHeAr Hollow Cathode) calibrations should be obtained every afternoon with the help of the Support Scientist [2]. Night-time, per-field arc-lamp exposures can be obtained through the instrument control software with an overhead of approximately 2 minutes. Telluric calibration stars (A0V or G2V) can be chosen from IRTF webpage [3].
Details on day-time calibrations are in the observing guide [4].
Links
[1] http://www.ctio.noirlab.edu/soar/user/login?destination=node/379%23comment-form
[2] mailto:spoints@ctio.noao.edu
[3] http://irtfweb.ifa.hawaii.edu/cgi-bin/spex/find_a0v.cgi
[4] http://www.ctio.noirlab.edu/soar/content/observing-guide#DaytimeCalib