Optical light curves of PTF09gpn, PTF12gcx, and PTF12kso. The circles show detections obtained with the P48 telescope and the squares indicate observations with the P60 telescope in Bgriz. Diamonds and stars mark the LCOGT and MLO photometry (obtained on the Johnson-Cousins BVRI photometric system; see Table A.2) for PTF12kso. Triangles indicate prediscovery 3σ limiting magnitudes from P48 observations. The corresponding light curves of SN 2006au (from Taddia et al. 2012) and SN 1987A (solid lines) are overplotted and shifted in magnitude to match those of our objects. The vertical dashed lines mark the spectroscopic epochs.