  In this paper we present the results of an optical and near infrared
identification of 514 radio sources from the FIRST survey (Faint Images of the
Radio Sky Survey at Twenty centimeters) with a flux-density limit of 1 mJy in
the NOAO Deep-Wide Field Survey (NDWFS) Bootes field. Using optical (Bw, R, I)
and K band data with approximate limits of Bw ~ 25.5mag, R ~ 25.8 mag, I ~25.5
mag and K~19.4 mag, optical counterparts have been identified for 378 of 514
FIRST radio sources. This corresponds to an identification rate of 34% in four
bands (BwRIK), 60% in optical bands (BwRI) and 74% in I band. Photometric
redshifts for these sources have been computed using the hyperz code. The
inclusion of quasar template spectra in hyperz is investigated. We note that
the photometric data are, in many cases, best matched to templates with very
short star-formation timescales and the inferred ages of identified galaxies
depend strongly on the assumptions about the star-formation timescale. The
redshifts obtained are fairly consistent with those expected from the K-z
relation for brighter radio sources but there is more scatter in the K-z
diagram at z<1.
