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In an intensive observational campaign in the 9 month duration of ChandraX-ray Visionary Project that was conducted in the year 2012, 39 large X-rayflares of Sgr A* were recorded. An analysis of the times of the observed flaresreveals that the 39 flares are separated in time by intervals that are groupedaround integer numbers times 0.10333 days. This time interval is thus theperiod of a uniform grid of equally spaced points on the time axis. Thegrouping of the flares around tic marks of this grid is derived from the datawith at least a 3.2 {\sigma} level of statistical significance. No signal ofany period can be found among 22 flares recorded by Chandra in the years2013-2014. If the 0.10333 d period is that of a nearly circular Keplerian orbitaround the blackhole at the center of the Galaxy, its radius is at 7.6Schwarzschild radii. Large flares were more likely to be triggered when theagent responsible for their outbursts was near the peri-center phase of itsslightly eccentric orbit.

A Pacemaker with P=2.48 hour Modulated the Generator of Flares in the X-ray Light Curve of Sgr A* in the year 2012