IMPORTANT NOTE about the v1 GLIMPSE image release - zody subtraction problem
20051122

Version 1 of the GLIMPSE images for l=350 through 295 (-10 through -65) deg
have been delivered to the SSC. There was a problem with the way we were subtracting
the zodiacal light from these images.  Our pipeline calculated a zodiacal
light background and we were subtracting that value from each frame.
But part of the Spitzer Space Telescope's processing is to subtract a DARK from the BCD 
image. Included in that DARK is a zodi component. Starting with S10.0 processing,
the zodi component of the dark is put in the fits header (SKYDRKZB). SSC also calculates 
their own zodiacal light value (ZODY_EST). What we should have done is subtract
(ZODY_EST - SKYDRKZB) from the image.  The result is we are oversubtracting the zodi.  
This doesn't affect the photometry and has a lesser affect on the images because 
of our high backgrounds.  We will fix this as we process the l=10 through 65 deg
images. We plan to re-process the entire GLIMPSE survey data next year, with new
SSC processing and improvements to our pipeline. The final data delivery at the end of
2006 will have fixed this problem but until then for the southern hemisphere images
available now, the zody subtraction will be incorrect.