Data associated with publication of 'Fabrication of high-quality joints between Gd-Ba-Cu-O bulk superconductors.' Each of the files in this dataset is associated with measurement of the magnetic trapped field profile for samples pre and post-jointing. The trapped magnetic field profiles have been measured using a rotating Hall probe array which has 19 Hall probes attached. These have been measured after field cooling to 77 K in a 1.4 T magnetic field. The samples are maintained at 77 K throughout measurement and measurements are taken at zero external magnetic field. Sample labelling: 1=A1, 3=D1, 4=E1, 5=B1, 6=C1, 7=B2, 11=B3, 12=D2 and 13=B4. Sample reference numbers were changed to make the manuscript easier for the reader to follow.