Subject: JEMX Monday Meeting 2004-11-08

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

JEMX status:
     The disconnection from IREM alerts was initiated 2004-11-05. Later
     that night IREM crashed and JEMX experienced a DPE crash about 40
     minutes later (~ 2004-11-06T02:30Z). It was up and running
     around 2004-11-06T06:00Z. JEMX returned to old configuration i.e.
     dependence on IREM was re-established. We'll see what happens
     next time IREM crashes.
     
     [Later info: There is no proven connection between the dis-connection
      from IREM and following DPE crash. The radiation activity is
      unusually high this period. The analysis of this event is still
      onging.]
      
Coordination meeting, Rome 2004-11-04. SB: There was an AI on JEMX team
     if diagnostic data is requested during slews. This is not (yet)
     required and the AI is closed.
     The data recovery from ground stations to MOC will not be performed
     on a standard basis. The data loss is estimated to 0.3% and the
     procedure is time-consuming.
     Dithering: The centerpoint will change a bit from cycle to cycle
     and the direction of the 5x5 dither will be 11.3 deg from instrument
     axes. The normal dither steps will be 2 deg (as usual) but during
     surveys they will be 2.17 deg. Hex dither is unchanged. The galactic
     latitude scan will also be in 2.17 deg steps.
     A Moon and Earth occultation request to shadow diffuse radiation
     is analyzed by MOC. There is a problem with missing star-tracker data.
     ISGRI tries to extend the energy range below 20 keV to perhaps 17 keV.
     
     The MOC database will be reloaded ultimo November. The JMX1 voltage
     will be set to two steps lower than what is currently in the database
     i.e. one step lower than what we use right now.
     
     ISOC will be able to foresee problems with unusually strong sources
     such as Sco X-1 on an observation basis - not on a pointing by
     pointing basis.
     
Science data production at ISDC: Peter Kretschmar has reported hot spot
     problems in the lowest energy band defined for the rerun. We
     recommend discarding the lowest energy band (suggested down to 1.8 keV)
     and change the next one to begin at 3 keV - the nominal lower limit.
     
Shadowgram uniformity: NL: The footprints of the amplifiers are clearly
     visible in the shadowgrams also when corrected with 'pixelfold'.
     The calibration data taken in Ferrara may no longer be valid but the
     production of new position corrections is not straightforward but
     work is ongoing.
     
/NJW
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Niels J. Westergaard
Danish Space Research Institute
Juliane Maries Vej 30, DK 2100 Copenhagen O
Phone: +45 35 32 57 05; FAX:  +45 35 36 24 75