Gain Notes for Revolution 797
	
JEM-X1: A quite normal revolution with fine gain fitting. All the data from 
this revolution should be useable. The Xe analysis confirms that the energy
determination for this revolution is good, within about 1-2% of the ideal. 
However, as for all revolutions, the first few science windows should be
avoided in any analysis requiring very good gain determination. Results shown
here use OSA8.0 software and so include temperature variation in the
smoothed gain model. 

The generally low level of the Xe line is due to the high gain pushing the line
towards the high energy cutoff, and is not indicative of problem with gain
correction, only with determination of the centre of the line, consequently
the gain correction is actually considerably better than the Xe line position
would seem to indicate.

Calibration source number 4 (purple/orange) is no longer
used for calibration purposes since an anode strip directly under the source
has broken and no useable signal comes from this area of the detector any
longer.

CAO 27/5/2009


JEM-X2: In this revolution, something strange seems to have happened with the
energy correction of this instrument. As the Xe line evolution during the
revolution shows, the line appears about 8% too high and steadily drops
to the ideal level during the first half of the orbit. It is therefore strongly
suggested that users avoid using Science Windows in the first half of this
revolution for any application requiring good energy determination.
The first part of this revolution has been declared a BTI so that OSA software
will ignore this data unless specifically told to include it in the processed
data of an observation. The BTI period is IJD = 3400.3 - 3401.2

CAO 29/5/2009