Gain Notes for Revolution 1191

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination and
IC Gain History table is needed.

NB:  The beginning of this revolution was heavily affected by a solar flare, the effects of
which ended by IJD 4579.65. This period is included in a BAD_RESPONSE BTI that started
in revolution 1190.
 

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 else. 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.

	
JEM-X1: 

The Xe line analysis performed using the IC table shows acceptable gain
correction for the later part of the revolution after the flare.
Here there are some wildly misfitted science windows, but otherwise the Xe level is
within 3% of the ideal. The jagged results in the early part of the revolution are due to
varying gain suppresion on the plate due to the solar flare and as usual, it is recommended that users
avoid the first few science windows for energy-sensitive applications as well as the entire
first 1/4 of the revolution up to about IJD 4579.6


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: Results coming soon.

CAO 18/07/2012

	Gain Notes for Revolution 1191
	

JEM-X2: 

The Xe line analysis performed using the IC table shows excellent gain
correction after the solar flare with all science windows  in this period having a Xe level 
within 1-2% of the ideal. For the beginnning of the revolution the SCWs are within 3-4% of
ideal, but these are covered by a BTI and should only be used by users who really 
understand the behaviour of thei nstruments. 
CAO 18/07/2012