|Space Telescope Science Institute|
|WFC3 Instrument Handbook|
We have made the standard updates to this Handbook, including the addition of references (throughout the Handbook) to the WFC3 Instrument Science Reports that were published in the past year and a summary of the WFC3 calibration plan for the upcoming cycle (Appendix E:Reduction and Calibration of WFC3 Data). Additional updates include:
• A new section on persistence as an instrumental effect on the WFC3/IR detector (Section 5.7.9) and updated guidance to observers in predicting and minimizing persistence in WFC3/IR exposures (Section 7.9.4, Appendix D:Bright-Object Constraints and Image Persistence)
• A revised discussion of sky background in WFC3 exposures, including the measurement of zodiacal light as a function of a target’s ecliptic latitude and angular distance from the sun using WFC3/IR exposures (Section 9.7) and investigation of an airglow line that can significantly increase the background level in some of the WFC3/IR filters and grisms (Section 7.9.5)
• Illustration of a diagram that can be generated in APT (Figure 8.9) to visualize the start and end of a spatial scan, an observing technique discussed in Sections 6.11.3, 7.10.4, and 8.6.