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We report on the detection of seven bursts from the periodically active,repeating fast radio burst (FRB) source FRB 180916.J0158+65 in the 300-400-MHzfrequency range with the Green Bank Telescope (GBT). Emission in multiplebursts is visible down to the bottom of the GBT band, suggesting that thecutoff frequency (if it exists) for FRB emission is lower than 300 MHz.Observations were conducted during predicted periods of activity of the source,and had simultaneous coverage with the Low Frequency Array (LOFAR) and the FRBbackend on the Canadian Hydrogen Intensity Mapping Experiment (CHIME)telescope. We find that one of the GBT-detected bursts has potentiallyassociated emission in the CHIME band (400-800 MHz) but we detect no bursts inthe LOFAR band (110-190 MHz), placing a limit of $\alpha > -1.0$ on thespectral index of broadband emission from the source. We also find thatemission from the source is severely band-limited with burst bandwidths as lowas $\sim$40 MHz. In addition, we place the strictest constraint on observablescattering of the source, $<$ 1.7 ms, at 350 MHz, suggesting that thecircumburst environment does not have strong scattering properties.Additionally, knowing that the circumburst environment is optically thin tofree-free absorption at 300 MHz, we find evidence against the association of ahyper-compact HII region or a young supernova remnant (age $<$ 50 yr) with thesource.

Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz