Gain Notes for Revolution 605
	
JEM-X1: A quite normal revolution with fine gain fitting. All the data from 
this revolution should be useable. Final confirmation of the goodness of the
gain calibration must be confirmed by a Xe analysis of the entire revolution.
The fact that this was the Crab calibration revolution in no way seems to have
affected this unit.

JEM-X2: This is was the Crab calibration revolution, in which JEM-X2 was
activated for the very first time in 6 months. Unfortunately, it was reactivated
with the incorrect energy channel linearization table and it took several 
hours before this was noticed and corrected. This means that data from the
first part of the revolution cannot be processed with the usual OSA and its
IMOD tables since one of the tables is incorrect for these hours. Also, since
the calibration spectra have also been clearly affected (see uncorrected figures)
by this problem, none of the data in this revolution can be processed using
the automatically generated gain history table. An IC gain history table
delivered to ISDC by us must be used for this revolution, even for data taken
after the correct linearization table was uploaded to the satellite. 
Data figures labelled `Uncorrected' show what happens when the gain correction
defaults to linear interpolation instead of smoothing when the non-IC table is
used. The other results show the data obtained when using the IC table.

The entire early period where the wrong onboard PHA binning table was used is
now declared an ISDC BTI and should not be used 
(BTI IJD= 2825.86650000 to 2826.53187180719). It was anyway during this
period that the usually inactive unit was warming up and stabilizing for use,
and even without the problem with the onboard table, this data would be of very
poor quality.

Apart from a 10 kSec staring observation of the Crab, this unit had nearly no
telemetry so that both the science data and calibration data are of very poor
quality due to very strong grey filtering (3% open). It is strong suggested 
that users do not use data outside of the dedicated JEM-X Crab observation.

The Xe line analysis results shown here were calculated using the IC Gain history
table version 1 delivered to ISDC October 2007. You can download this from the
last column of the table, under the link "ICgainHistoryTable", or as part of the
ISDC IC package. When running the OSA software with the latest IC package, the
OSA scripts will automatically find the latest IC gain history table if one exists for
the revolution you are processing.

If you have problems processing data from this revolution, please do not hesitate to
contact me at oxborrow@space.dtu.dk

CAO 1/10/2007