Flow of sample selection showing the data sources in orange, number of SNe at each stage of the process in blue, and filtering criteria in green. The number of each SN type at each stage of the process is shown. The search on WISeREP produced 8 GRB-SNe, 44 type Ic-BL SNe, and 130 type Ic SNe. Since the classifications reported on WISeREP may be unreliable, we performed a literature search for these SNe to confirm their types. For those SNe that could not be found in the literature, we classified them using SNID (Blondin & Tonry 2007). This step produced 52 confirmed type Ic-BL SNe and 8 GRB-SNe. Whilst searching the literature to confirm SN types, we identified an additional 1 GRB-SN and 61 type Ic-BL SNe. A total of 29 GRB-SNe were gathered from the GRBSN webtool, some of which had already been found in the literature and WISeREP searches. Combining data for events found in multiple data sources and imposing a minimum of three spectra from GRBSN or WISeREP resulted in a final sample of 61 type Ic-BL SNe and 13 GRB-SNe. We also obtained spectra for GRB180427A-SN2018fip from the ESO archive, bringing the number of spectra above the threshold of three and allowing for its inclusion in the final dataset.