Distribution of the peak B-band absolute magnitude at the lens redshift versus the lens redshift for the transients that passed the base cuts described in Sect. 4.1 (blue contours), the candidates passing the two selection methods described in Sects. 4.2 and 4.3 (green and orange crosses, respectively), and for the already discovered glSNe Ia SN Zwicky and iPTF16geu (black and grey stars, respectively). The upper limit of the x axis has been adjusted for clarity, omitting one higher redshift object from S1 (ZTF20acirhoc).