2.8 STIS Snapshot Policies

Both imaging and spectroscopic STIS/MAMA snapshots are allowed, but the combined total of STIS/MAMA snapshot targets accepted in Cycle 13 will not exceed 300, with imaging targets limited to a total of 100, due to the target and field bright-object checking requirements. Moving targets are not permitted for STIS/MAMA snapshot visits. Variable STIS/MAMA snapshot targets must have well defined maximum UV fluxes, which will be used for the bright-object checking. There are no restrictions on the numbers or variability of proposed STIS/CCD snapshot targets, as they do not require bright-object checking and have a significantly higher expected completion rate. Thus, use of the STIS/CCD G230LB or G230MB gratings is encouraged as an alternative to the NUV-MAMA.

In addition, STIS/MAMA snapshot proposals should be limited to one or a few straightforward configurations. Specifically, use of the F25NDQ filters will not be allowed in MAMA snapshot proposals. Use of the 0.2X0.2 echelle aperture is recommended for first-order programs without a scientific need for a long-slit in order to expedite the field bright object screening process; these configurations will be supported as of Cycle 13. Because of the limited resources available for bright-object checking combined with the relatively low expected completion rate, excessively complex STIS/MAMA snapshot targets, fields, or instrumental configurations may not be implemented in Phase 2. If you are in doubt on this issue, you may consult with a member of the Spectrographs Group via the Help Desk.