Gain Notes for Revolution 541
	
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 short break in data taking is well fitted and should have no effect on the
science data.

JEM-X2: This was the revolution where JEM-X2 was turned on to warm up before
the next Crab calibration. Unfortunately, a telemetry problem just where the
HV supply was switched off for a short period (just before IJD=2636.00) means
that the last gain history points before the switch off contain useless values
that have confused the gain smoothing program. Gain correcction prior to
IJD=2636.00 in this revolution are very poor for the JEM-X2 unit and should
not be used. A corrected gain table will be produced offline and delivered
to ISDC as an Instruments Characteristics file. In future the ISDC software will
automatically use this table for gain corrections.

CAO 30/04/2007