Correction of Field Rotator-Induced Flat-Field Systematics - A Case Study Using Archived VLT-FORS Data

S. Moehler, W. Freudling, P. Moller +3

ESO's two FOcal Reducer and low dispersion Spectrographs (FORS) are the primary optical imaging instruments for the VLT. They are not direct-imaging instruments, as there are sever…