We report the discovery of a transient radio source 2.7 arcsec ( 0.1 pc projected distance ) South of the Galactic Center massive black hole , Sagittarius A* .
The source flared with a peak of at least 80 mJy in March 2004 .
The source was resolved by the Very Large Array into two components with a separation of \sim 0.7 arcsec and characteristic sizes of \sim 0.2 arcsec .
The two components of the source faded with a power-law index of 1.1 \pm 0.1 .
We detect an upper limit to the proper motion of the Eastern component of \sim 3 \times 10 ^ { 3 } { km s ^ { -1 } } relative to Sgr A* .
We detect a proper motion of \sim 10 ^ { 4 } { km s ^ { -1 } } for the Western component relative to Sgr A* .
The transient was also detected at X-ray wavelengths with the Chandra X-ray Observatory and the XMM-Newton telescope and given the designation CXOGC J174540.0-290031 .
The X-ray source falls in between the two radio components .
The maximum luminosity of the X-ray source is \sim 10 ^ { 36 } { erg s ^ { -1 } } , significantly sub-Eddington .
The radio jet flux density predicted by the X-ray/radio correlation for X-ray binaries is orders of magnitude less than the measured flux density .
We conclude that the radio transient is the result of a bipolar jet originating in a single impulsive event from the X-ray source and interacting with the dense interstellar medium of the Galactic Center .