Event rate vs. fluence for different surveys, corrected for a pulse length of 8 ms. The limits from the results of Pilot B are presented by the line in the upper-right corner. The symbols represent rate (pentagram and squares) and upper limits for other instruments observing below 1 GHz, where green symbols observe around 800 MHz, red symbols around 350 MHz, and blue symbols below 200 MHz. Survey or telescope name, mid-frequency, DM range, and references are given in Table 3. The dashed red line assumes log(event rate)/log(fluence) = −1 and the cyan dash-dotted line assumes log(event rate)/log(fluence) = −3/2, with an adjustment of the fluence assuming a spectral index of −1.1 to a reference frequency of 140 MHz.