Gain Notes for Revolution 262
	
JEM-X1: A quite ordinary revolution with fine gain smoothing. All data from 
this revolution should be useable. The short break in mid-revolution has no
effect on either the gain smoothing or gain correction of the data.
The first two points of each data set are the partial switch-on with the High 
Voltage 3 steps below its nominal value.

A gas contamination test using variable setting of the VC voltage was performed
during this revolution (see break in gain history), and this time period has
officially been designated a BTI due to engineering tests. The ISDC software
will automatically disregard science data from this time period. The BTI is at:
IJD= 1801.45 to 1801.57.

In a couple of cases the hook that appears at the beginning of the revolution
where fast and slow relaxation effects compete, the down swing of the hook is
not well fitted, so users are well advised to be cautious using spectral
data from this settling period. This caveat however, applies to all JEM-X data,
even where gain smoothing functions perfectly, because it cannot be estimated
to what extent the four calibration sources reflect the settling occurring all
over the microstrip plate.


CAO 10/11/2006