Optical observations of Ultra Steep Spectrum radio sources
  In this paper we present follow-up optical observations of Ultra Steep
Spectrum sources that were found by matching 150 MHz GMRT sources with either
the 74 MHz VLSS or the 1400 MHz NVSS. These sources are possibly high-redshift
radio galaxies but optical identification is required for clarification. The
follow-up observations were conducted with the Liverpool Telescope; in all
cases no sources are detected down to an R magnitude of ~23. By applying models
and using the K-z relation we are able to suggest that these sources are
possibly at high redshift. We discuss how 2m class telescopes can help with the
identification of HzRGs from large-scale, low-frequency surveys.
