GHRS Instrument Science Report 074: Introduction

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Cycle 6 is the last with the GHRS operating onboard HST before its removal during the 1997 Servicing Mission. The GHRS has been operating nominally in most respects since the first Servicing Mission. Therefore the philosophy of the Cycle 6 calibration plan is to continue with the ongoing monitor programs during Cycle 6. They will be scheduled such that a smooth transition between Cycle 5 and 6 occurs, and that science observations are bracketed by calibrations at the end of the cycle.

There will be one special GHRS calibration program in addition to the routine monitors during Cycle 6. A close-out sensitivity measurement will be performed when the COSTAR mirrors have been removed from the GHRS light path. This test is also described in this ISR.

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