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PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomenaover timescales of seconds to (at least) hours, including nulling, subpulsedrifting, and mode-changing. Studying pulsars like PSR B0823+26 providesfurther insight into the relationship between these various emission phenomenaand what they might teach us about pulsar magnetospheres. Here we report on theLOFAR discovery that PSR B0823+26 has a weak and sporadically emitting 'quiet'(Q) emission mode that is over 100 times weaker (on average) and has a nullingfraction forty-times greater than that of the more regularly-emitting 'bright'(B) mode. Previously, the pulsar has been undetected in the Q-mode, and wasassumed to be nulling continuously. PSR B0823+26 shows a further decrease inaverage flux just before the transition into the B-mode, and perhaps trulyturns off completely at these times. Furthermore, simultaneous observationstaken with the LOFAR, Westerbork, Lovell, and Effelsberg telescopes between 110MHz and 2.7 GHz demonstrate that the transition between the Q-mode and B-modeoccurs within one single rotation of the neutron star, and that it isconcurrent across the range of frequencies observed.

LOFAR discovery of a quiet emission mode in PSR B0823+26