...NED

The NASA/IPAC extragalactic database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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...either

Now B and R magnitude are available from USNO-A1.0 (1996, CD-ROM version, U.S. Naval Observatory).

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...Table 1

One exception is 1RXS J085930.1+745510, its final counterpart is proved not to be the proposed one. We have listed information for the real counterpart too.

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...objects

We have not taken BL Lac object candidates into accout, otherwise the selection efficiency would be higher.

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