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We present the results of the most sensitive and comprehensive survey yetundertaken for radio pulsars and fast transients in the Andromeda galaxy (M31)and its satellites, using the Westerbork Synthesis Radio Telescope (WSRT) at acentral frequency of 328 MHz. We used the WSRT in a special configurationcalled 8gr8 (eight-grate) mode, which provides a large instantaneousfield-of-view, about 5 square degrees per pointing, with good sensitivity, longdwell times (up to 8 hours per pointing), and good spatial resolution (a fewarc minutes) for locating sources. We have searched for both periodicities andsingle pulses in our data, aiming to detect bright, persistent radio pulsarsand rotating radio transients (RRATs) of either Galactic or extragalacticorigin. Our searches did not reveal any confirmed periodic signals or brightsingle bursts from (potentially) cosmological distances. However, we do reportthe detection of several single pulse events, some repeating at the samedispersion measure, which could potentially originate from neutron stars inM31. One in particular was seen multiple times, including a burst of six pulsesin 2000 seconds, at a dispersion measure of 54.7 pc cm^-3, which potentiallyplaces the origin of this source outside of our Galaxy. Our results arecompared to a range of hypothetical populations of pulsars and RRATs in M31 andallow us to constrain the luminosity function of pulsars in M31. They also showthat, unless the pulsar population in M31 is much dimmer than in our Galaxy,there is no need to invoke any violation of the inverse square law of thedistance for pulsar fluxes.

A search for radio pulsars and fast transients in M31 using the WSRT