Comparison of WISE frames covering the J0109+6134 field taken in 2010 February (top) and August (bottom), both in the 4.6 μm filter. The brightness of the blazar counterpart has obviously changed in the time between the frames. The large arc is part of the J0109+6134 Fermi LAT error circle. The small circle and cross represent the Swift and Chandra X-ray positions, respectively. North is up and East is left.
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