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
  In an intensive observational campaign in the 9 month duration of Chandra
X-ray Visionary Project that was conducted in the year 2012, 39 large X-ray
flares of Sgr A* were recorded. An analysis of the times of the observed flares
reveals that the 39 flares are separated in time by intervals that are grouped
around integer numbers times 0.10333 days. This time interval is thus the
period of a uniform grid of equally spaced points on the time axis. The
grouping of the flares around tic marks of this grid is derived from the data
with at least a 3.2 {\sigma} level of statistical significance. No signal of
any period can be found among 22 flares recorded by Chandra in the years
2013-2014. If the 0.10333 d period is that of a nearly circular Keplerian orbit
around the blackhole at the center of the Galaxy, its radius is at 7.6
Schwarzschild radii. Large flares were more likely to be triggered when the
agent responsible for their outbursts was near the peri-center phase of its
slightly eccentric orbit.
