Space Telescope Science Institute   3.8 Director's Discretionary (DD) Time Proposals Chapter 4:  Observation Types and Special Requirements

3.9 Guaranteed Time Observer Programs


NASA has generally awarded a portion of the observing time in the years following the installation of a new instrument to those scientists involved in the development of this instrument. The interests of these Guaranteed Time Observers (GTOs) are protected through duplication policies, as described in Section 5.2.1.


 3.8 Director's Discretionary (DD) Time Proposals Chapter 4:  Observation Types and Special Requirements
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