To determine the Pan-STARRS (PS1) survey efficiency for detecting impacting asteroids as a function of time and size we divided our sample of 130,000 synthetic impactors into six independent sets that were assigned different absolute magnitudes (H) as shown in Table 2. We can assign any H to the impactors because the Bottke NEO model assumed that the size distribution of the NEOs was independent of the orbital elements. The six selected sizes span almost two orders of magnitude in diameter. The number of objects of each size was selected to provide a good number of derived objects (after processing through MOPS) and yet not so many objects as to be prohibitively expensive in processing time. Each of these six independent sets of impactors were then run through a simulation of the PS1+MOPS system.