Subject: JEMX Monday Meeting 2005-04-04

Present: NL, CAO, SB, JC, CBJ, NJW

JEMX status: Nominal. SB presented plots that showed the detector
      temperature during Crab calibration. The increase for JMX1 was indeed
      ~4 deg C. JMX2 gain as previous Crab calibration and energy resolution
      a little bit better.
      
      The gain correction failure after 030000310010 has to do with the
      lacking TM science packets earlier in the revolution.
      
      It is really a pity that the ISDC analysis system does not allow
      the inclusion of selected HK data to be present in the Gain History
      Table. Many of the difficulties of the gain correction stem from
      the situation that an entire revolution must be fitted but HK values
      are only available for the actual science window. (A glitch can
      last an hour and can therefore make a fit in a single ScW completely
      useless).
      
Crab calibration. CBJ: For the narrow dither the RMS of the flux values
      (large energy range) is about 1% (counting statistics predict 0.5%).
      For the normal 5x5 dither with 2 deg step the RMS value is 5%.
      Crab position error (RMS) is 0.0015 deg.
      
OSA5 preparations:
      j_ima_iros: Differences between Linux and Solaris
                runs at ISDC, e.g. different number of sources found.
      
      j_ima_mosaic: Problems with vignetting matrices. JC showed a test
                image. [After the meeting: A data format discrepancy was
                spotted and after that was corrected the problem disappeared].
      Alignment Matrices have been delivered, no response from Roland Walter
                 yet. We should make a more thorough test how the new
                 matrices affect the positions of the sources not used
                 in the matrix generation.
                 
other business: One person ought to go to the ESLAB symposium 19-21/4 2005
        SB and NJW will check possibilities.
        
/NJW
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Niels J. Westergaard
Danish National Space Center
Juliane Maries Vej 30, DK 2100 Copenhagen O
Phone: +45 35325705; FAX:  +45 35362475