We report on radio and X-ray observations of the only known repeating Fast Radio Burst ( FRB ) source , FRB 121102 .
We have detected six additional radio bursts from this source : five with the Green Bank Telescope at 2 GHz , and one at 1.4 GHz with the Arecibo Observatory for a total of 17 bursts from this source .
All have dispersion measures consistent with a single value ( \sim 559 pc cm ^ { -3 } ) that is three times the predicted maximum Galactic contribution .
The 2-GHz bursts have highly variable spectra like those at 1.4 GHz , indicating that the frequency structure seen across the individual 1.4 and 2-GHz bandpasses is part of a wideband process .
X-ray observations of the FRB 121102 field with the Swift and Chandra observatories show at least one possible counterpart ; however , the probability of chance superposition is high .
A radio imaging observation of the field with the Jansky Very Large Array at 1.6 GHz yields a 5 \sigma upper limit of 0.3 mJy on any point-source continuum emission .
This upper limit , combined with archival WISE 22- \upmu m and IPHAS H \alpha surveys , rules out the presence of an intervening Galactic H ii region .
We update our estimate of the FRB detection rate in the PALFA survey to be 1.1 ^ { +3.7 } _ { -1.0 } \times 10 ^ { 4 } FRBs sky ^ { -1 } day ^ { -1 } ( 95 % confidence ) for peak flux density at 1.4 GHz above 300 mJy .
We find that the intrinsic widths of the 12 FRB 121102 bursts from Arecibo are , on average , significantly longer than the intrinsic widths of the 13 single-component FRBs detected with the Parkes telescope .