Calibration Images

CFHT has provided images for photometric calibration of your science images. Exposures on Landolt fields are taken as part of nightly procedure (runID: Q97). Additionally, if your program requires photometry and the images were not taken on a photometric night, short exposures for each OB having an exposure time longer than 2 minutes have been taken on a photometric night to calibrate long exposure science images (runID: Q98). These short exposures for calibration are taken using a special QSO program, and the time is not charged to your program. These images are included in a table identical to the science exposure log table for easy browsing.