Gain Notes for Revolution 1059 Gain Notes for Revolution 1059 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. 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="/". 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 with large scatter of the Xe position, though with the exception of a couple of misfitted outliers all Science Windows fall within 2-3% of the ideal. As usual however, it is recommended that users avoid the first few science windows for energy-sensitive applications. 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. CAO 20/07/2011 JEM-X2: The Xe line analysis performed using the IC table shows largely very good gain correction. However, as well as two misfit points (representing 2 SCWs each, having very large widths), there are about 8 science windows that show unusually low Xe line positions, but also very small widths,so these too may be simply misfits.All the other science windows show a steady level within 2-3% of the ideal. As usualr, it is recommended that users avoid the first few science windows for energy-sensitive applications. CAO 06/07/2011