Subject: JEM-X Monday Meeting 2006-02-06

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

JEMX status: Third Earth observation has just been performed. Hot stripe in JMX2 
as
seen in the previous EO is absent.
Three new dead anodes in JMX1: 2 on the 2006-01-27 and 1 on 2006-01-29,
addresses 114,115, 160, 200-201. Number 114 was weak beforehand.
HV is rather high (a change request for lowering it has been submitted
and is in the planning revolution 407). Now 27 dead anodes on JMX1 and 28 on 
JMX2.

The upper PHA cut-off level is more important at high gains because photons
above 35 keV might be rejected due to this. Also the rebinning of the
linear PHA into transmitted PHA has a very broad upper bin. It is proposed
to change this binning in order to give a better representation for high
signals. There are many implications, however, that need to be investigated
in all details before the change is implemented.

Next HV reduction should not wait as long as in this round (which is
delayed as a consequence of the Earth Observations).

Earth Observation (SB): From INTEGRAL's point of view it has proceeded
according to plan.
In EO 2 there was a lot of other radiation - the dip when the Earth
is on-axis is not as pronounced as in EO1. EO3 seems to be the observation
in best (i.e. calm) conditions. Optical observations of Northern Light
shows that EO1 was in time of weak activity. On the other hand for the EO2
period there is much more optical emission. Second, the increased count
rate has a triangular shape that could be a reflection of the JEMX
vignetting function.

NL: Tries to make false pointing directions that will trick the mosaicking to 
overlay
the images so that the Earth does not move in the FOV.

CBJ & NJW: The spectral analysis of JMX1 for EO1 gives a photon index around 1.8
which is softer than the reference HEAO DXB spectrum. The JEMX collecting power 
is
about 0.5 cm2 sterad.

Moscow meeting (NL): Presentations. Abstracts due March 1, 2006.

/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