Subject: JEMX Monday Meeting 2006-03-06

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

JEMX status (SB): No hotspot activity. Perhaps due to lower voltage?

Discussion of the event status flag: defined in the correction step.
     - the 'used area' detector map not yet implemented but would be
       a logical step for keeping track of useful detector area.
     - j_ima_shadowgram ought to update such a map since j_ima_iros
       does not look for empty regions in the detector map (but it
       checks for hot splots and excludes them and keeps a record
       in order to apply the correct detector area.)
The hotspot detection works by detecting areas with number of counts
well above the average over a science window and all energies. The
hotspot activity is, however, mostly confined to lower energies and
can in principle be of quite short duration.

Actions: Check user manual to make sure that the shadowgram event
rejection as well as radius limitation is well explained. These
should be as open as possible because j_ima_iros makes its own
selections. A test following the analysis of a science checking
the various selections must be done.

HK counter wrap around (SB): In revolution 411 there were events with
bad time allocations. The standard ISDC pipeline rejects the period of
the science window after the first event with a problem even though there
are useful data after the bad period. This is for revision 1 data.
In revolution 248 a similar thing happened. In revision 2 data in the archive
only the bad period is thrown away. Since it is a tiny fraction of the data
that is lost this way so we will not insist that these events are recovered
considering the work load at ISDC.

ISDC experiences (CAO): We really need to be there every month since there
seems to be JEM-X specific questions are not addressed in detail.
We would like to get copies of the questions addressed to the help desk
about JEM-X so that we at least learn where the difficulties are.
The question of old software used in the pipeline for NRT processing
is in the process of being solved.
We must specify what images to present (IMATYPE==INTENSITY, IMADESCR=RES+SRC)
to NM, SS, and others.
Check NRT data 041000530010.000 for GTI values that are missing.
Look at gain correction for the Earth observation since there is too high
count rate right in the beginning of the observation in the 3-5 keV range.
New soft ware delivery procedure that is to be used.

Can we make an earlier switch-on after radiation belt exit that used
in the current procedure? We could use IREM to signal permissible time.
Right now it looks as if we could switch-on an hour earlier so that gain
will be stable over a longer period.

Bulge monitoring results (JC): Burst sources monitored.

Crab calibration planning (NL): We might get 9+9 packects of TM (TBD).
The date has not yet been settled. ISDC has asked for a NOMEX
investigation observation so there is less time available and we
have been asked if we could accept a somewhat lower total time.

AOB: CBJ has submitted an abstract to SPIE. Perhaps we could present Earth
observation results. A technical approach supplemented with some results.

/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