Gain Notes for Revolution 717
	
JEM-X1: A quite normal revolution with fine gain fitting. All the data from 
this revolution should be useable. The Xe analysis confirms that the energy
determination for this revolution is okay, within about 3% of the ideal. 
However, the general level of the Xe line appears to be quite low. This may
have to do with the fact that the gain of the instrument is currently very
high and this puts the Xe peak on a sharp falloff at high energy that surpresses
the peak on its high side and hence pushes the position of the peak to lower
energies. If this is the case, no correction for this low Xe line needs to
be performed since all the lower energy photons will still have been corrected
to their proper value.


CAO 31/10/2008

JEM-X2: Initially the gain calibration for this revolution was very bad, with
an average Xe line position at 27.90KeV. To remedy this problem, due to gain
aging of the instrument, an new spatial gain table, part of the IMOD group,
has been produced and an IC table of the corrected detector gain has been
delivered to ISDC. Users should ensure that their data is processed using one
of these tables. Therefore, be sure that you have the latest IC and IMOD tables
from ISDC. Otherwise, the IC gain history table can be downloaded from this
site (last column of the table that contains these notes) and used simply by
setting the gainHist parameter to point to this table when invoking j_cor_gain
in the OSA pipeline:

gainHist="<my IC subdirectory>/JMX2_gainHistoryIC_rev0717_003.fits[JMX2-GAIN-OCL,1]

If you have the complete set of IC tables as provided by ISDC, the OSA software
will locate the IC file for this revolution automatically and use it in place
of the automatically generated gain history table from ISDC without any
intervention by the user.

Once the correct tables are used this is a quite normal revolution with 
excellent gain fitting. All the data from 
this revolution should be useable. The Xe line analysis confirms the very
good calibration for this revolution with all except the very first Science
Windows having an Xe line position within 1% of the ideal value. it is always
advisable to avoid the first few Science Window of each revolution for
applications requiring very good energy determination.



CAO 22/1/2009