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The eclipses of certain types of binary millisecond pulsars (i.e. `blackwidows' and `redbacks') are often studied using high-time-resolution,`beamformed' radio observations. However, they may also be detected in imagesgenerated from interferometric data. As part of a larger imaging project tocharacterize the variable and transient sky at radio frequencies <200 MHz, wehave blindly detected the redback system PSR J2215+5135 as a variable source ofinterest with the Low-Frequency Array (LOFAR). Using observations with cadencesof 2 weeks - 6 months, we find preliminary evidence that the eclipse durationis frequency dependent ($\propto \nu^{-0.4}$), such that the pulsar is eclipsedfor longer at lower frequencies, in broad agreement with beamformed studies ofother similar sources. Furthermore, the detection of the eclipses in imagingdata suggests an eclipsing medium that absorbs the pulsed emission, rather thanscattering it. Our study is also a demonstration of the prospects of findingpulsars in wide-field imaging surveys with the current generation oflow-frequency radio telescopes.

Low-radio-frequency eclipses of the redback pulsar J2215+5135 observed in the image plane with LOFAR