RFC-356: LSST reference catalog fluxes (currently only used by single frame and jointcal photometric calibration) will be provided in maggies. If the original catalog flux is not provided in maggies, LoadReferenceObjectsTask will convert and return the catalog appropriately, with metadata describing the conversion factor to the original catalog flux, e.g. 1maggie=3631Jy for refcats with Jansky fluxes.
As a stop-gap to our high level provenance system managing the absolute photometric calibration and final conversion to Jansky, we can save the above metadata in PhotoCalib and provide a few methods to use it.
This Epic encompasses updates to the developer and pipeline docs, LoadReferenceObjectsTask, PhotoCalib, and singleFrame and jointcal photometric calibration to support this new refcat format internally in the stack. It does not encompass the design of the high level absolute flux conversion system (i.e. phi function; eq. 5 in the SRD) that will provide users Janksy in accordance with the DPDD.