Gain Notes for Revolution 2872

Due to noise and a strong source in the field of view, there is
	a Bad Time Interval (BTI) between IJD = 9152.2 to 9153.0. since no instrument
	lines can be seen to confirm the energy determination. This is probably due
	to a strong source in the field of view that has depressed the gain on the
	microstrip plates and swamped the instrument lines. 

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination an
IC Gain History table is needed. These gain history tables are found
automatically by OSA, or can be downloaded from the DTU FTP site.
 
All offline gain/energy corrections (including the IC tables) are based on the
two Fe calibration sources in JEM-X1, for both units, then corrected iteratively
using the instrument background lines (Xe, backed up by Cu and Mo).

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:  Very excellent (within 1-2% of ideal, except for 
	the BTI and a weak misfitted point at the end of the revolution.) 

JEM-X2: Also very excellent, except for the BTI. 

CAO 31/01/2025

	Gain Notes for Revolution 2872
	

JEM-X2 rating:     (within  % of ideal, except for settling zone)

The JEM-X2 corrections are based on the JEM-X1 Fe calibration sources, since
all the Cd sources are now too weak to use.

CAO 31/01/2025