HRI Temporal Calibration Status

The gain (mean PHA channel) and quantum efficiency (count rate) of the ROSAT HRI are monitored frequently using N132D and the UV calibration lamp. The links below are to postscript files describing these quantities over the lifetime of the mission.

Note: The HV was mistakenly set back to 12 starting March 3, 1997 and was reset back to 13 on May 6, 1997, at 12:40 UT.


UV calibration Lamp
Last Updated: August 24, 1999