1. Gain Corrections: Impact on SWIRE Jason Surace (SWIRE Team)

2. SWIRE Gain Corrections Part of SWIRE processing is a BCD-wise correction to background. During this process, background (almost entirely zodiacal light) is zeroed in the BCDs. Result is multiplied by the gain correction (derived by Joe) Background is then added back into images, and processing continues. Images that are mosaiced already have gain corrections applied to point sources or other high spatial frequency structure.

3. 5x5’ mosaics of gain corrections. SWIRE uses a half- array offset mapping pattern.

4. Offsets Between Pre- and Post-Correction Chan 11 meanminmax 10.50.0-3.31.3 20.60.0-4.31.5 31.4-0.9-8.82.6 40.9-0.3-6.02.6 All are percent differences.

5. ch1ch2 ch3ch4 Offsets Between Pre- and Post-Correction