HAWK-I Calibrations

"The High Acuity Wide field K-band Imager (HAWK-I) instrument is a cryogenic wide field imager operating in the wavelength range 0.9 to 2.5 microns. It has been in operations since 2007 on the UT4 at the Very Large Telescope Observatory in seeing-limited mode. In 2017-2018, GRound Layer Adaptive optics Assisted by Lasers module (GRAAL) will be in operation and the system GRAAL+HAWK-I will be commissioned. With GRAAL, already installed, HAWK-I will operate more than 80% of the time with an equivalent K-band seeing of 0.55\" (instead of 0.7\" without GRAAL). I will present here an overview of the calibration plan for HAWK-I and GRAAL+HAWK-I and particularly the challenging aspects for optimal science products and instrument health monitoring."