Issues with SPHERE ZIMPOL reference calibration frames since September 2015
Published: 21 Jan 2016
Since Sept 2015, SPHERE ZIMPOL calibrations (flats, modulation calibrations, and pinhole images) suffer from the following issue: the first plane(s) of the raw frame data cube can show no or less counts from the lamp than the remaining planes of the cube.
The ZIMPOL data reduction pipeline recipes for flats and modulation calibrations are not tuned to ignore the first low counts planes and might result in bad calibration products.
A new archive news will be published once the problem will have been rectified.