  We have searched for prompt radio emission from nine Gamma Ray Bursts (GRBs)
with a 12 m telescope at 1.4 GHz, with a time resolution of 64 us to 1 s. We
detected single dispersed radio pulses with significances >6 sigma in the few
minutes following two GRBs. The dispersion measures of both pulses are well in
excess of the expected Galactic values, and the implied rate is incompatible
with known sources of single dispersed pulses. The arrival times of both pulses
also coincide with breaks in the GRB X-ray light curves. A null trial and
statistical arguments rule out random fluctuations as the origin of these
pulses with >95% and 97% confidence, respectively, although a simple population
argument supports a GRB origin with confidence of only 2%. We caution that we
cannot rule out RFI as the origin of these pulses. If the single pulses are not
related to the GRBs we set an upper limit on the flux density of radio pulses
emitted between 200 to 1800 s after a GRB of 1.27 w^{-1/2} Jy, where 64 us < w
< 32 ms is the pulse width. We set a limit of less than 760 Jy for long
timescale (>1 s) variations. These limits are some of the most constraining at
high time resolution and GHz frequencies in the early stages of the GRB
phenomenon.
