Process POINTING observations in the summit pipeline REDUCE_POINTING_SUMMIT
For DREAM/STARE, the images from the individual subarrays are combined, sky emission removed (assuming a simple DC offset) and corrected for extinction.
SCAN-mode data are passed to the iterative map-maker. Fast-ramp flatfield files are processed and stored so the iterative map-maker can use them.
The image is cropped to 150 arcsec on a side, and if the source is a known calibrator, the pipeline calculates FCFs. The map is then calibrated and tagged as a reduced product.
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.
This recipe is largely the same as REDUCE_POINTING with minor modifications specific to handle data as they are taken.
The pointing offsets, beam size and FCF are written to the log files log.pointing, log.beam and log.fcf.
Fast-ramp flatfield data are processed and results written to the log file log.flatfield.
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. They are written into the output file as a JCMT::Pointing extension.