Gain Notes for Revolution 1508

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.

Offline calibration for this revolution based on the JEM-X1 Fe calibration sources
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 good gain
correction with all science windows (taken 2 at a time) having a Xe level 
within about 2% of the ideal, except for initial settling period points. 
As usual, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).

JEM-X2: 

The Xe line analysis performed using the IC table shows very good gain
correction with all science windows (taken 2 at a time) having a Xe level 
within 2% of the ideal, except for the initial settling period. However, this
period of unstable gain calibration lasts somewhat longer than usual, and users
with data within the first 12 SCWs of the revolution should look out for energy
values that may be 5% higher than they should be, even after OSA has discarded
the first SCWs for spectral analysis and other energy-dependent applications.
It is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).


CAO 11/03/2015