This recipe combines images from a POINTING observation, removes sky emission and corrects for extinction before calculating the offsets in Azimuth and Elevation from the nominal (0,0) position. The recipe also determines the beam size and the flux conversion factor (FCF) and writes them to log files.

The image is processed with a matched filter before estimating the pointing offsets, but this output is not retained on disk. The reduced product remains the coadd.

For additional record keeping, the source position is fitted and offsets in Azimuth and Elevation from the nominal (0,0) position are derived and logged. Note, however, that these may not be identical to those derived by the telescope POINTING_FOCUS task.

• The pointing offsets, beam size and FCF are written to the log files log.pointing, log.beam and log.fcf.

• This recipe deals with both the 2-D DA-processed images and the time series data. Primitives which are meant for 2-D images are no-ops for time-series data.

• The pointing offsets are calculated from the centroid position and a fit to the source.

The coadd is displayed in Gaia window 2; its variance is displayed in window 3.