inside each 2-dimensional [[*WGS*]{}]{} projection (see Paper III for more details).

It is interesting to note that 17 out of 284 $\gamma$-ray sources in the 2FGL have a “better", on the basis of our method, $\gamma$-ray blazar candidate within the SR. These associations need to be verified with followup observations, as for example in the X-rays, and a deeper analysis to check their reliability relative to the 2FGL association method will be performed in a forthcoming paper[@massaro12b].

Results {#sec:ugs}
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The application of our association procedure to the 313 UGSs selected from the 2FGL (see Section \[sec:sample\] for more details), led to the associations of 156 UGSs with a low-energy candidate $\gamma$-ray blazar counterpart within their SRs. According to our criteria (see Section \[sec:association\]), these 156 new associations consist of 44 sources of class A, 74 of class B and 38 of class C. Thus our procedure finds associations with likely $\gamma$-ray blazar candidates for 49.8% of the UGSs analyzed. We also list of all the $\gamma$-ray blazar candidates with lower class for each UGSs, if more than one is present within the SRs. Among these 156 new associations, for 86 sources, 12 of class A, 43 of class B 