Final JWST Duplication Checks Can Be Made After April 6
If your planned JWST Cycle 1 proposals involve targets that are potential duplications of observations included in the Guaranteed Time Observer (GTO) or Early Release Science (ERS) program, you should make a final duplication check after April 6, 2020.
Why? GTO and ERS teams have been directed to submit a final revision of their programs by March 31 using APT 2020.2 (the final version to be used by all JWST Cycle 1 proposals). After this submission, it will take several days to populate the Program Information Tool with the final information. This process is estimated to be complete by April 6.
While the changes to the currently planned programs may be small, it is possible for the GTO/ERS teams to make minor revisions to their programs, such as exposure times, filters, and dispersers. As part of this revision, it is not possible to add new targets to existing GTO programs, but it is possible to drop targets previously planned.