Gain Notes for Revolution 365


JEM-X2: 
This unit was turned on only for the Crab calibration exercises. This
data should not be used since it involves several changes in the HV setting
performed to study the instrument's electronic efficiency. This data is not
suitable for scientific purposes and all JEM-X2 data from this revolution is
covered by a Bad Time Interval, IJD=2110.00 to 2111.00.
For Instrument Team users: there is a bug/loophole in j_cor_gain 7.3 (OSA 6.0
version) which means that it cannot correctly smooth the automatically produced
ISDC Gain History table for JEM-X2 because data is missing for the first row of
the first source. This was not a problem for j_cor_gain 6.4 (OSA 5.1) which would not
take in incomplete rows, but could not handle whole anode segments being 
switched off. This means that an IC gain history delivered to ISDC must be used
instead of the standard gain history table. If you have the newest IC tables
installed and OSA 6.0 this is not a problem - the software will find the IC
table for you. Otherwise, download the corrected table from the Gain History
Archive (the page that linked you to these notes) and use the table by setting
the hidden parameter in the OSA GUI:
gainHist = <path to myDir/<myDir>/JMX2_gainHistoryIC_rev0365_001.fits[JMX2-GAIN-OCL,1]


CAO 7/06/2007