Apertif data accompanying Chromatic periodic activity down to 120 megahertz in a fast radio burst by Inés Pastor-Marazuela and team are available here. These data can be analysed with the tools shared at https://zenodo.org/record/4559593.
The LOFAR data are available through the LOFAR Long Term Archive, by searching for “Observations” at J2000 coordinates RA=01:57:43.2000, DEC=+65:42:01.020.