Gain Notes for Revolution 2232

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.

N.B.: This is the first revolution after the attitude problems that 
occured in May 2020. Therefore there is BTI for the first 3/4 of revolution during
which time the gain is extremely low. The BTI is between 7449.5 to 7451.5 IJD.
 

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: After the end of the BTI the gain determination is excellent as usual
	with Xe line positions with about 2% of the ideal position.

JEM-X2: After the BTI gain determination is very excellent - within 1-2% of
	ideal.

The JEM-X2 corrections are based on the JEM-X1 Fe calibration sources, since
all the Cd sources are now to0 weak to use.

CAO 08/06/2020