  Blazars are highly variable, radio-loud active galactic nuclei with jets
oriented at a small angle to the line of sight. The observed emission of these
sources covers the whole electromagnetic spectrum from radio frequencies up to
the high or even very high energy gamma-ray range. To understand the complex
physics of these objects, multi-wavelength observations and studies on the
variability and correlations between different wavelengths are therefore
essential. The long-term multi-frequency observations of PKS 0048-097 are
analysed here to investigate its spectral and temporal features. The studies
includes nine years of observations of the blazar, which is well studied in the
optical and radio domain, but not in the other frequencies. Multi-wavelength
data collected with OVRO, KAIT, Catalina, Swift/UVOT, Swift/XRT and Fermi/LAT
were studied. The performed analysis revealed strong variability in all
wavelengths that is most clearly manifested in the X-ray range. The correlation
studies do not exhibit any relation between different wavelengths, except for
the very strong positive correlation between the optical emission in V and R
bands.

High Energy Astrophysical Phenomena