Fig. 1
Digitized Sky Survey image of the field of PKS 1502+106 and Mkn 841 in red filter. The image vertical size corresponds to 7 arcmin. The two optical sources are indicated. Over-plotted are the error circles of the IBIS detections of January 2006 (larger circle, with a radius of 5 arcmin) and August 2008 (smaller circle, radius of 2.4 arcmin).
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