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The relatively unexplored fast radio transient parameter space is known to behome to a variety of interesting sources, including pulsars, pulsar giantpulses and non-thermal emission from planetary magnetospheres. In addition, avariety of hypothesized but as-yet-unobserved phenomena, such as primordialblack hole evaporation and prompt emission associated with coalescing massiveobjects have been suggested. The 2007 announcement by Lorimer et al. of thedetection of a bright (30 Jy) radio pulse that was inferred to be ofextragalactic origin and the subsequent consternation have demonstrated boththe potential utility of bright radio pulses as probes of the interstellarmedium and intergalactic medium, as well as the need for wide-field surveyscharacterizing the fast-transient parameter space. Here we present results fromthe 450 hour, 150 deg^2 Fly's Eye survey for bright dispersed radio pulses atthe Allen Telescope Array (ATA). The Fly's Eye spectrometer produces 128channel power spectra over a 209 MHz bandwidth, centered at 1430 MHz, on 44independent signals paths originating with 30 independent ATA antennas. Datawere dedispersed between 0 and 2000 pc cm^-3 and searched for pulses withdispersion measures greater than 50 pc cm^-3 between 625 us and 5 s induration. No pulses were detected in the survey, implying a limiting rate ofless than 2 sky^-1 hour^-1 for 10 millisecond duration pulses having apparentenergy densities greater than 440 kJy us, or mean flux densities greater than44 Jy. Here we present details of the instrument, experiment and observations,including a discussion of our results in light of other single pulse searches.

The Allen Telescope Array Fly's Eye Survey for Fast Radio Transients