XMM-Newton Science Analysis System


rgsangles (rgsangles-4.9.2) [xmmsas_20230412_1735-21.0.0]

Algorithm

  Set state CAL/OAL

  get columns from EVENTS table
  setup new columns in EVENTS table

  Get source position from RGS SRCLIST table

  Get reference attitude from RGS SRCLIST table

  loop over EXPOSU0n tables
     call processFramesTable to fill ASPCDSP and ASPCXDSP columns of
                             EXPOSU0n table
                 using gratingAspectAngles(time, referenceAttitude)
  end loop

  loop over all times to find elements with available attitude

  call processEvents to correct BETA, XDSP with attitude drift
                 using phi0=offAxisAngles(referenceAttitude, sourcePos)

       processEvents{
             Calculate corrected beta
             beta_corr = betaraw + (Qfactor * ASPCDSP / sin(betaraw)) 

             if (cross dispersion) xdsp_corr =  xdspRaw + ASPCXDSP
       }

  store factor ASPFACT1 in header EVENTS table
         Qfactor = FoverL * sin(alpha0 + phi0dsp*FoverL) 

  bin BETA_CORR into BETA_CHANNEL
  bin XDSP_CORR into XDSP_CHANNEL