Gain Notes for Revolution 2000

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 rating: Excellent (Xe line positions within 2% of ideal)

JEM-X2 rating: Also excellent.

The JEM-X2 corrections are based on the JEM-X2 Corrected gain history table
from revolution 1998 because all the Cd sources are now too weak to use.
Usually, the JEM-X2 calibration corrections are done using the JEM-X1 GH
data which tracks temperature changes very well for both instruments. However,
for this revolution which is a Crab calibration revolution it was decided to
try to see how well the JEM-X2 unit could be calibrated using its own previous
calibration data, as though JEM-X1 were not functioning. The results show that
this method of calibration for the JEM-x2 unit is possible if JEM-X1 is no longer
viable.

CAO 25/09/2018