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Westerbork Synthesis Radio Telescope (WSRT, Westerbork Radio Telescope) is an array of 14 dishes, 10 in fixed locations and 4 on tracks, near the town of Westerbork in the Netherlands, completed in 1970 and run by ASTRON.
One of the receiver types, APERTIF (or Apertif), consists of a focal plane array of radio receivers, designed to increase the field of view, especially useful for surveys. Twelve of the telescopes have APERTIF FPAs installed, which are generally performing surveys.
Note: the survey-based designator WSTB is used to designate WSRT radio sources, e.g., "WSTB 64W55", a first number indicating a particular list of sources and the second, a number for a particular source within that list. There are more than sixty such numbered lists of WSRT observations. These sources are sometimes cited in the form "64 W 55" (i.e., not including the prefix "WSTB").
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