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FRB 20180916B is a well-studied repeating fast radio burst source. Itsproximity (~150 Mpc), along with detailed studies of the bursts, have revealedmany clues about its nature -- including a 16.3-day periodicity in itsactivity. Here we report on the detection of 18 bursts using LOFAR at 110-188MHz, by far the lowest-frequency detections of any FRB to date. Some bursts areseen down to the lowest-observed frequency of 110 MHz, suggesting that theirspectra extend even lower. These observations provide an order-of-magnitudestronger constraint on the optical depth due to free-free absorption in thesource's local environment. The absence of circular polarization and nearlyflat polarization angle curves are consistent with burst properties seen at300-1700 MHz. Compared with higher frequencies, the larger burst widths(~40-160 ms at 150 MHz) and lower linear polarization fractions are likely dueto scattering. We find ~2-3 rad/m^2 variations in the Faraday rotation measurethat may be correlated with the activity cycle of the source. We compare theLOFAR burst arrival times to those of 38 previously published and 22 newlydetected bursts from the uGMRT (200-450 MHz) and CHIME/FRB (400-800 MHz).Simultaneous observations show 5 CHIME/FRB bursts when no emission is detectedby LOFAR. We find that the burst activity is systematically delayed towardslower frequencies by ~3 days from 600 MHz to 150 MHz. We discuss these resultsin the context of a model in which FRB 20180916B is an interacting binarysystem featuring a neutron star and high-mass stellar companion.

LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B