XMM-Newton Science Analysis System


ommag (ommag-3.13.1) [22.0.0-9173c7d25-20250127]

Algorithm

subroutine ommag

   Read in task parameters

   Open OM OSW Source List file

   Read in the detection-limit count rate.

   Read in the source list table extension keywords from the primary header

   Extract the background limiting counts from the SRLLIST binary-table
   extension.
   Convert this to a limiting magnitude.
   Extract coordinates, photometry radii, count rate, count-error rate and
   background counts, for each source, from the SRCLIST binary-table extension

   Open OM ODF Priority Window Data Auxiliary file

   Get the frame time from the OM ODF Priority Window Data Auxiliary file

   Get the ccd mode



   Loop over source list

      
      For the ultraviolet filters, extraplolate the source count-rate to a
      35-pixel aperture radius. Correct the count-rates for the CCD dead-time.
      Calculate the source  magnitude using  the  corrected count-rate.

   end loop

   Write count rates and magnitudes to SRCLIST extension of OM OSW Source List file
   Add the limiting magnitude and write it to the source-list file.
end subroutine ommag