Low frequency observations of radio relics and halos
  Diffuse radio emission from galaxy clusters in the form of radio halos and
relics are tracers of the shocks and turbulence in the intra-cluster medium.
The imprints of the physical processes that govern their origin and evolution
can be found in their radio morphologies and spectra. The role of mildly
relativistic population of electrons may be crucial for the acceleration
mechanisms to work efficiently. Low frequency observations with telescopes that
allow imaging of extended sources over a broad range of low frequencies ($< 2$
GHz) offer the best tools to study these sources. I will review the Giant
Metrewave Radio Telescope (GMRT) observations in the past few years that have
led to: i) statistical studies of large samples of galaxy clusters, ii) opening
of the discovery space in low mass clusters and iii) tracing the spectra of
seed relativistic electrons using the Upgraded GMRT.
