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BL Lacertae objects (BL Lacs) represent a large fraction (22\%) of gamma-raysources in the Third Fermi Large Area Telescope catalog (3FGL). Nearly half ofthe BL Lac population remains without a redshift because of their featurelessoptical spectra. We aim to increase the number of BL Lacs with a redshiftmeasurement by using the photometric technique. For this work, we have used 6Swift-UVOT filters and SDSS g,r,i,z optical filters mounted on the 0.65 mSARA-CTIO located in Chile and the 1.0 m SARA-ORM in Canary Islands. A sampleof 45 sources was selected from the 3FGL catalog for which photometry wasperformed in 10 optical and UV filters to obtain redshift measurements. Wefound 3 sources with z>1.3 while reliable upper limits have been derived for 17sources. The results presented here bring the total number of high-z (z>1.3) BLLacs to 29.

Hunting distant BL Lacs with the photometric technique using Swift and SARA