SWS in-flight calibration

The calibration of the Short Wavelength Spectrometer on ISO developed significantly throughout ISO's mission and well into the Post Operations phase. The guiding principles, however, were laid down in the In-Orbit Calibration Document (IOCD) before the launch of ISO. This document specified the essential calibration procedures for SWS and aided greatly the success of the SWS instrument. Within the framework of the IOCD, the SWS calibration and processing were allowed to remain flexible and could adjust to AOT logic changes, model updates and changes in the calibration methods used in the Post Mission phase. The result is that the final accuracies surpass pre-launch requirements. During the mission a number of expected and unexpected issues arose. The majority of these have been addressed either as changes to observation strategies or as changes in data reduction. Some issues, like memory effects, were purely instrumental and dealt with entirely in the Post Operations Phase. There are other problems, however, which have been identified but have, as yet, no correction in the SWS calibration and processing. These issues form the caveats to the SWS data products.