Gain Notes for Revolution 1571

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination and
IC Gain History table is needed.
 

To get optimal results with this revolution it is necessary to use the IC gain history.
See notes in revolutions prior to revolution 1433 to find out how to do this
if you don't already know.

All offline gain/energy corrections (including the IC tables) are based on the
two Fe calibration sources in JEM-X1, for both units.

Latest OSA software (version 10 and higher) automatically cuts out the first
Science windows of data from each revolution to ensure that people do not use data
from the instrument-settling period. This process can be overruled, but only by
experienced users.
	
JEM-X1: 

The Xe line analysis performed using the IC table shows very excellent gain
correction with all science windows  having a Xe level 
within about 1% of the ideal, except for the very first point. This is
absolutely astonishing that the instruments can deliver this degree of
consistency after 13 years in space. 
As usual, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0), even
though the Xe line appears good for all but one - not all the settling effects show
up in the Xe line position.


JEM-X2: 

The Xe line analysis performed using the IC table shows very excellent gain
correction with all science windows having a Xe level 
within 1-2% of the ideal, except for the first couple of them. This gain 
determination is very good indeed throughout the revolution, just as with
unit 1.
As usual however, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).

The JEM-X2 corrections are based on the JEM-X1 Fe calibration sources, since
all the Cd sources are now to weak to use.

CAO 14/8/2015