XMM-Newton Science Analysis System


gtialign (gtialign-2.12) [22.0.0-9173c7d25-20250127]

Algorithm

   subroutine gtialign

      open gti_in
      open events_in
      open gti_out
	
      read gti_starts
      read gti_stops

      foreach ccd

         create gti_out extension

         read frame_times

         foreach frame_time
            frame_start = get_start(frame_time, time_del, time_offset)
            foreach gti_start
               if( gti_start < frame_start )
                  gti_new_start = frame_start
                  break gti_start loop
               endif
            next

            frame_end = get_end(frame_time, time_del, time_offset)
            foreach gti_stop
               if( gti_stop < frame_end )
                  gti_new_stop = get_end(frame_time-1, time_del, time_offset)
                  break gti_stop loop
               endif
            next	
         next

         write gti_out extension, gti_new_start, gti_new_stop

      next

      close files

   end subroutine  gtialign