Subject: JEMX Monday Meeting 2004-09-06

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

Status of JEMX:
     Temperature development: JMX1 detector has dropped by 4.0 deg, the
            detector box by 4.6 deg. JMX2 DFEE box has dropped 22 deg
            (from about 15 degC to -7degC)
            Gain drop of about 4%
            Energy resolution continues its usual degradation; no jump
            observed when temperature was lowered.

OSA4 is installed on swarm1 Linux PC - NL will use it for making a list
     of all midisky_b9 sources for all survey data

Crab calibration: We may get some extra TM packets from SPI and OMC. OMC
     does not need to be operative all the time.
     
Latest countrate data: Unusual light curve of detector counts in the latest
     revolution - GRS1915 activity ? - to be investigated further.
     
Pixel sizes and collimator footprint: No clear correlation between background
     counts and pixel size as derived from pixel-lower-left-corner-position
     table. CBJ: This could be due to the very nature of the background
     counts - would be better to check with real photon events, but how?
     
Midisky/JEMXIROS. Now auxiliary arrays will be generated if not already
     present. This reduces the number of programs in the package.
     
GX3+1 long X-ray burst: ATEL#327 has been sent out. Seems to fall between
     superbursts and long bursts. We need to do some time resolved spectral
     fitting.

SGR1806-20: TOO in rev. 225. About 10 bursts, most of them show agreement
     between JEMX and IBAS results wrt. localization. We are missing some
     IPF data for that revolution, but JC will organize a replay in ISDC
     to get them.
     
     The instrument is not suited for such observations with very short
     spikes of very high count rates. Due to the 5-buffer we miss the
     detailed light curve because JEMX goes into saturation. It was discussed
     if it would be possible by some re-programming of onboard software
     to come around that. No solution was found but thinking continues.

SN1006: A poster showing positive JEMX detections will be presented
     at the AAS HEAD meeting
     
/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