The current calibration pipeline does not apply any walk correction in the dispersion direction even though walk-induced errors can be more than a resolution element in some cases. The current geometric correction, which was derived without considering walk effects, is also known to have inaccuracies. As part of our efforts to improve the wavelength calibration of COS, we have revisited the existing walk and geometric correction using both prelaunch and on-orbit data.
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David J. Sahnow, Steven Penton, Thomas Ake, Gisella DeRosa, Justin Ely, Sean Lockwood, Cristina Oliveira, Rachel Plesha, Charles Proffitt, Julia Roman-Duval, Paule Sonnentrucker, Joanna Taylor, James White, "Correcting for errors due to walk and geometric distortion in the COS FUV detector," Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99052T (18 July 2016);