Gain Notes for Revolution 1019

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination a
IC Gain History table is needed. It is also a Crab  calibration revolution 
during which the instrument team performed some electronic efficiency experiments
by raising and lowering the HV value. There is a BTI during these engineering
exercises, and SCWs between IJD 4066.3 and 4066.5 should never be used for
scientific purposes. However, a longer BTI has also been declared from
IJD 4066.5 to the end of the revolution (IJD 4067.5) due to bad response
and non-standard configurations.
 

	
JEM-X1: 

The Xe line analysis performed using the IC table shows good gain
correction with all except the very first science windows having a Xe level 
within 3% of the ideal. The actual gain correction is probably better than
this, but with the revolution split up into so many (106) SCWs, the noise 
on the data is very large compared to revolutions with only 62 SCWs. 
As usual however, it is recommended that users
avoid the first few science windows for energy-sensitive applications.


Calibration source number 4 (purple/orange) is no longer
used for calibration purposes since an anode strip directly under the source
has broken and no useable signal comes from this area of the detector any
longer.

	

JEM-X2: 

The Xe line analysis performed using the IC table shows okay gain
correction with all except the very first science windows,and the
many misfitted outliers, having a Xe level 
within 3% of the ideal. As usual however, it is recommended that users
avoid the first few science windows for energy-sensitive applications.

CAO 22/02/2011