The Breakthrough Listen Search For Intelligent Life Near the Galactic
  Center I
  A line-of-sight towards the Galactic Center (GC) offers the largest number of
potentially habitable systems of any direction in the sky. The Breakthrough
Listen program is undertaking the most sensitive and deepest targeted SETI
surveys towards the GC. Here, we outline our observing strategies with Robert
C. Byrd Green Bank Telescope (GBT) and Parkes telescope to conduct 600 hours of
deep observations across 0.7--93 GHz. We report preliminary results from our
survey for ETI beacons across 1--8 GHz with 7.0 and 11.2 hours of observations
with Parkes and GBT, respectively. With our narrowband drifting signal search,
we were able to place meaningful constraints on ETI transmitters across 1--4
GHz and 3.9--8 GHz with EIRP limits of $\geq$4$\times$10$^{18}$ W among 60
million stars and $\geq$5$\times$10$^{17}$ W among half a million stars,
respectively. For the first time, we were able to constrain the existence of
artificially dispersed transient signals across 3.9--8 GHz with EIRP
$\geq$1$\times$10$^{14}$ W/Hz with a repetition period $\leq$4.3 hours. We also
searched our 11.2 hours of deep observations of the GC and its surrounding
region for Fast Radio Burst-like magnetars with the DM up to 5000 pc cm$^{-3}$
with maximum pulse widths up to 90 ms at 6 GHz. We detected several hundred
transient bursts from SGR J1745$-$2900, but did not detect any new transient
burst with the peak luminosity limit across our observed band of
$\geq$10$^{31}$ erg s$^{-1}$ and burst-rate of $\geq$0.23 burst-hr$^{-1}$.
These limits are comparable to bright transient emission seen from other
Galactic radio-loud magnetars, constraining their presence at the GC.
