Evolution of the Response Function

The Response Function (RF) is computed during (photometric) technical or calibration nights. For this purpose spectrophotometric standars are observed with Grism 11 and a slit of 5". Because EFOSC2 uses an UV-flooded CCD, it is important to monitor the response in the blue region of the spectrum.

The figure below shows RFs computed in different dates.


Response, Grism 11