During the last week Chandra's observing schedule was interrupted by an anomaly connected with the High Resolution Camera (HRC) 15V power supply that occurred at 8:17am EDT on Feb 9, when Chandra was out of ground contact. The anomaly was identified at the next ground contact and led the flight team to turn off the HRC and suspend the science loads at 12:51pm EDT on Feb 9. Related actions included the manual commanding of a support heater and disabling SCS-29 on Feb 9 and changing the on-board ObsID on Feb 10.

The cause of the HRC anomaly is under investigation. All science observations are temporarily suspended because the HRC anticoincidence shield provides real-time data for safing of the science instruments in the event of elevated space radiation levels. The team is currently working to define and implement operational changes to allow resumption of ACIS science observations without the HRC anticoincidence shield.

The unavailability of the HRC instrument prevented nominal operations following the HRC anomaly.