Gain Calibration Notes for Rev. 363
	
JEM-X1:
Relatively little noise and no large glitches. This revolution has a longish
break towards the end of the revolution. For some sources this break is long
enough to provoke a gain increase when the High Voltage is turned on again,
for others a gain decay occurs as in the case of short breaks. For still others,
the two competing effects ( ion settling and charge settling) seem to cancel
out.

The smoothing is however correct, so there should be no problem using data
from this entire revolution.

The Xenon line analysis shows that the Xe line is well within the 29-30keV
range for most of the revolution. The only time period where the Xe line was outside
the 29-30 keV range was at the very beginning of the revolution just after
switch on. Users should be cautious when using these first science windows in a
revolution for critical spectral analyses. Otherwise, the gain correction has
worked very well.


The cause of the medium-sized break:
From INTEGRAL Mission Report #159:
"On 2005-10-05, due to a ground station outage, JEM-X1 was commanded 
to  Safe mode at 06:51:55Z and was returned to Data Taking mode at 
15:38:38Z."


JEM-X2:
Unit switched off. No data or housekeeping for this revolution.

CAO 7/2/2007