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: http://www.stsci.edu/itm/1998-06/ITM_1998_06A.html
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ITM-1998-06: Policies for the Telescope Time Review Board
(TTRB): Repeating HST Observations, Changes to Accepted HST Programs,
Resolution of Duplications, and Other Program Alterations
This document presents STScI policy for granting formal changes, additions, andalterations to accepted HST programs, as well as for repetitions of failed observations. Four types of request may be made by a GO, GTO, CS, or PC. All are made using a web tool. The first type is a HOPR (HST Operations Problem Report), which describes an operational problem that occurred in obtaining data and which requests a repetition of the lost observation. The second type is a PCR (Program Change Request), which asks for specific alterations to upcoming observations that are significant enough to warrant official approval (such as a target change). The third type is a Dupli-cation or Data Conflict Resolution (DDCR), which is a request from a Contact Scientist to adjudi-cate an apparent duplication in use of HST or conflict of data rights.