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All observations with observing constraints other than those listed in Chapter 7 are considered ``time-critical'' and the Constraints Form must be filled out. Note that your proposal must be rated with the priorities A and B (cf., § 8.2.1 , § 8.3 ) in order to be scheduled; it thus faces additional competition in the proposal selection process and further, the total time available for such constrained observations will not be greater than 5 percent of the total observing time (cf., Chapter 8 ). A Constraints Form has to be filled out for every target to which additional constraints apply.
Four different types of constraints are considered:
Note that only one type of observing constraint can be selected.