The Hydrogen-Poor Superluminous Supernovae from the Zwicky Transient Facility Phase-I Survey: I. Light Curves and Measurements

During the Zwicky Transient Facility (ZTF) Phase-I operation, 78 hydrogen-poor superluminous supernovae (SLSNe-I) were discovered in less than three years, making up the largest sample from a single survey. This paper (Paper I) presents the data, including the optical/ultraviolet light curves and classification spectra, while Paper II in this series will focus on the detailed analysis of the light curves and modeling. Our photometry is primarily taken by the ZTF in the \(g,r,i\) bands, and with additional data from other ground-based facilities and Swift. The events of our sample cover a redshift range of \(z = 0.06 - 0.67\), with a median and \(1\sigma\) error (16\% and 84\% percentiles) \(z_{\rm med} = 0.265^{+0.143}_{-0.135}\). The peak luminosity covers \(-22.8\,{\rm mag} \leq M_{g,\rm peak} \leq -19.8\)\,mag, with a median value of \(-21.48^{+1.13}_{-0.61}\)\,mag. Their light curves evolve slowly with the mean rest-frame rise time of \(t_{\rm rise} = 41.9\pm17.8\)\,days. The luminosity and time scale distributions suggest that low luminosity SLSNe-I with peak luminosity \(\sim -20\)\,mag or extremely fast rising events (\(