A Deep Search for Prompt Radio Emission from the Short GRB 150424A With
  The Murchison Widefield Array
  We present a search for prompt radio emission associated with the
short-duration gamma-ray burst (GRB) 150424A using the Murchison Widefield
Array (MWA) at frequencies from 80-133 MHz. Our observations span delays of 23
s-30 min after the GRB, corresponding to dispersion measures of 100-7700
pc/cm^3. We see no excess flux in images with timescales of 4 s, 2 min, or 30
min, and set a 3 sigma flux density limit of 3.0 Jy at 132 MHz on the shortest
timescales: some of the most stringent limits to date on prompt radio emission
from any type of GRB. We use these limits to constrain a number of proposed
models for coherent emission from short-duration GRBs, although we show that
our limits are not particularly constraining for fast radio bursts because of
reduced sensitivity for this pointing. Finally, we discuss the prospects for
using the MWA to search for prompt radio emission from gravitational wave
transients and find that while the flux density and luminosity limits are
likely to be very constraining, the latency of the gravitational wave alert may
limit the robustness of any conclusions.
