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In 1989, the Whipple 10m telescope achieved the first indisputable detectionof a TeV gamma-ray source, the Crab Nebula. Until its decommissioning in 2011,the Whipple telescope took regular measurements of the nebula. With the recentdiscovery of GeV gamma-ray flaring activity in the Crab Nebula, it is anopportune time to return to the Whipple telescope data set and search itsextensive archive for evidence of TeV flares. A data set on the Crab Nebulaspanning ten years, 2000 - 2010, is compiled and searched for day-scale flaringactivity using a Bayesian-block binning algorithm. No evidence for significantflaring activity is found. Monte Carlo simulations show that low levels of fluxincrease on short timescales are difficult to detect. Assuming a flare durationof seven days, 99% confidence level upper limits are calculated for thepossible frequency of five-fold, two-fold and 1.5-fold flares in the data set.An upper limit of 0.02 flares per year is found for the five-fold flare, and alimit of 0.27 flares per year is placed on the two-fold flare. The detection ofthe 1.5-fold flare is consistent with the false-positive rate of the method,and so cannot be excluded.

The search for short-term flares in extended VHE Crab Nebula observations with the Whipple 10m telescope