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Measuring the size distribution of small (km-scale) KBOs can help constrainmodels of Solar System formation and planetary migration. Such small, distantbodies are hard to detect with current or planned telescopes, but can beidentified as sub-second occultations of background stars. We present theanalysis of data from the Weizmann Fast Astronomical Survey Telescope (W-FAST),consisting of fast photometry of ~10^6 star hours at a frame rate of 10-25 Hz.Our pipeline utilizes a matched-filter approach with a large template bank,including red-noise treatment, and injection of simulated events for estimatingthe detection efficiency. The KBO radius at which our survey is 10% (50%)efficient is 1.1 (2.0) km. The data from 2020-2021 observing seasons wereanalyzed and no occultations were identified. We discuss a sample of sub-secondfalse-positive events, both occultation-like and flare-like, which are stillnot fully understood but could be instructive for future surveys looking forshort-duration events. We use our null-detection result to set limits on thekm-scale KBO number density. Our individual radius bin limits are consistentwith most previous works, with N(r>1km) <=10^6 deg^-2 (95% confidence limit).Our integrated (all size) limits, assuming a power law normalized to large (~45km) KBOs gives a power law index q<3.93 (95% confidence limit). Finally, ourresults are in tension with a recently reported KBO detection from the ground,at the p=4x10^-4 level.

A search for Kuiper Belt occultations using the Weizmann Fast Astronomical Survey Telescope