Gain Notes for Revolution 1706

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.

NB: The last half of this revolution (after IJD 6052.35) contains a SCO X-1 observation
that causes gain variations as well as increased calibration noise due to
automatic grey filtering.
 

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 exemplary gain
correction with all science windows (taken 1 SCW at a time)for the first
half of the reolution,  having a Xe level 
within about 1% of the ideal, except for the usual settling points. During the
SCO X-1 observation Xe levels are within 4% of ideal, for the start of the
observation and within 3% thereafter, which is good gain correction.
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: 

Identical comments as for JEM-X1 above, but first half for JEM-X2 has an
excellent rating (Xe line points within 2% of ideal). Second half of revolution
is degraded but still good. Misfitted points off the figure are disregarded.

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 01/08/2016