16906

This program obtains observations of two spectrophotometric white dwarf standard stars (WD0308-565 and GD71) at all COS2025-compliant cenwaves and FP-POS at LP6 for G160M modes. The data will be used to determine the 2D cross-dispersion spectral profiles and traces required to perform two-zone extraction comma as well as the sensitivities and flat-fields for accurate flux calibration. Additionally comma the data will be used to determine the spatial resolution of the detectors. WD0308-565 is the primary target for this program due to its status as a flux standard and TDS target. GD71 is used to more efficiently calibrate Segment A. The main requirement for this program is to achieve S-N of about 50 per resel comma which is driven by the requirement for obtaining profiles that are sufficiently accurate that the contours can be located such that the enclosed flux errors are less than 1%. This program ties in with the FUV spectroscopic sensitivity monitoring program (PID 16830) during which near-contemporaneous observations at the new LP will be obtained to monitor any rapid evolution in the gain.