Gain Notes for Revolution 1847

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 a revolution with a break in data taking due to the limited 
connection to the Kiruna ground station. Despite this break, the energy determination
for both units has been adjusted offline so that it is as reliable as
revolutions without such a break. This was the revolutionfor which joint
observations with other satellites were performed so as to do a cross-calibration
of multiple instruments. 
 

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, except for first settling period (Xe position within 2% of ideal)


JEM-X2 rating: Excellent, except for both settling periods

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 09/08/2017