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Following Ford et al. (2011, 2012) and Steffen et al. (2012) we derived thetransit timing of 1960 Kepler KOIs using the pre-search data conditioning (PDC)light curves of the first twelve quarters of the Kepler data. For 721 KOIs withlarge enough SNRs, we obtained also the duration and depth of each transit. Theresults are presented as a catalog for the community to use. We derived a fewstatistics of our results that could be used to indicate significantvariations. Including systems found by previous works, we have found 130 KOIsthat showed highly significant TTVs, and 13 that had short-period TTVmodulations with small amplitudes. We consider two effects that could causeapparent periodic TTV - the finite sampling of the observations and theinterference with the stellar activity, stellar spots in particular. We brieflydiscuss some statistical aspects of our detected TTVs. We show that the TTVperiod is correlated with the orbital period of the planet and with the TTVamplitude.

Transit Timing Observations from Kepler. VIII Catalog of Transit Timing Measurements of the First Twelve Quarters