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We present the first blind interferometric detection and imaging of amillisecond radio transient with an observation of transient pulsar J0628+0909.We developed a special observing mode of the Karl G. Jansky Very Large Array(VLA) to produce correlated data products (i.e., visibilities and images) on atime scale of 10 ms. Correlated data effectively produce thousands of beams onthe sky that can localize sources anywhere over a wide field of view. We usedthis new observing mode to find and image pulses from the rotating radiotransient (RRAT) J0628+0909, improving its localization by two orders ofmagnitude. Since the location of the RRAT was only approximately known whenfirst observed, we searched for transients using a wide-field detectionalgorithm based on the bispectrum, an interferometric closure quantity. Over 16minutes of observing, this algorithm detected one transient offset roughly 1'from its nominal location; this allowed us to image the RRAT to localize itwith an accuracy of 1.6". With a priori knowledge of the RRAT location, atraditional beamforming search of the same data found two, lower significancepulses. The refined RRAT position excludes all potential multiwavelengthcounterparts, limiting its optical luminosity to L_i'<1.1x10^31 erg/s andexcluding its association with a young, luminous neutron star.

The RRAT Trap: Interferometric Localization of Radio Pulses from J0628+0909