Gain Notes for Revolution 956
	
JEM-X1: No scientific data or gain history for this unit.


JEM-X2: Due to the high gain of the detector during this revolution, the
gain correction level has been surpressed by a non-linear effect caused
by aging of the instrument. This causes a systematic 2% lowering of the
gain correction for this revolution, which though not terrible is not the
best gain correction we can achieve. Do not use these science data for
energy-sensitive applications until the revolution has been processed
with an offline gain IC table delivered to ISDC by DNSI.


To get optimal results with this revolution it is necessary to use the IC gain history
table that has been created offline at DNSC, instead of the gain history table
created automatically by OSA. If you have the newest package of IC files from ISDC
and these are correctly installed, OSA will find the IC gain history table automatically
and you don't need to do anything. The updated ISDC Instrument Characteristics
can be downloaded from
http://www.isdc.unige.ch/integral/download/osa_sw


However, if you don't have the IC gain table
package from ISDC you can download the table from the gain history archive by
anonymous ftp through the link provided. Download the table to some suitable
subdirectory for your analysis, then set the hidden OSA parameter gainHist:
gainHist="<my subdirectory>/<IC filename>". These files are used instead of the
automatically generated gain history tables wherever there has been an unusual or
non-linear behaviour of the detector gain.


The Xe line analysis performed using the IC table shows excellent gain
correction with all science windows having a Xe level 
within 1% of the ideal. 

CAO 2/09/2010