Gain Notes for Revolution 2684

During this revolution there was another TOO during which there
	was strong grey-filtering causing the Xe calibration line
	to be swamped by the filtering and the strong source. It is
	therefore not possible to determined the goodness (or badness)
	and then this period must be declared a BTI.
Due to solar activity the gain throughout the entire revolution
	is well below 20 chans/keV so that all the low-energy photons
	are lost in the low-level discriminator. Therefore the entire
	revolution must be declared a BTI for poor gain determination
	between 8652.0 to 8654.6 IJD. 
There is no JEM-X2 data for this revolution due to re-allocation of TM
	packets due to the TOO observations of Swift J1727.8-1613. 

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: Excellent outside the TOO, but too low to make quality spectra or
		light curves (within  2\%\ of ideal, except for settling zone, and all the 
		points in the TOO period; BTI therefore covers 8652.2 to 8654.4 IJD.)

JEM-X2: No science data from JEM-X2 for this revolution. 

CAO 14/09/2023

	Gain Notes for Revolution 2684

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:     (Xe line positions within  % of ideal, except for settling zone). 

JEM-X2: Results coming soon.

CAO 14/09/2023