IRAC High Precision Photometry

Dataset:

wasp 43 ch2 2s subarray

r42615040  

2011-07-29T23:08:34.966

 

Symptoms

• All 64 frames in one bcd, ~2.7 hours into the observation, have elevated flux across the whole frame (multiplied by ~1E5).  It looks like a normal image when displaying with ds9, only the photometry indicates something is wrong.  The flux levels in the bcd stack before and after are fine.
• The imask implies the whole image is non-linear
• The uncertainties (_bunc.fits) image is all nan's.

 

Explanation

The source of this problem is a corrupted header.  The barrel shift and some other header keywords were corrupted in transmission, causing the pipeline to not be able to correctly process the image.