The Galactic Position Dependence of Fast Radio Bursts and the Discovery
  of FRB 011025
  We report the detection of a dispersed Fast Radio Burst (FRB) in archival
intermediate-latitude Parkes Radio Telescope data. The burst appears to be of
the same physical origin as the four purported extragalactic FRBs reported by
Thornton et al. (2013). This burst's arrival time precedes the Thornton et
al.~bursts by ten years. We consider that this survey, and many other archival
low-latitude (|gb|<30deg) pulsar surveys, have been searched for FRBs but
produced fewer detections than the comparatively brief Thornton et al.~search.
Such a rate dependence on Galactic position could provide critical supporting
evidence for an extragalactic origin for FRBs. To test this, we form an
analytic expression to account for Galactic position and survey setup in FRB
rate predictions. Employing a sky temperature, scattering, and dispersion model
of the Milky Way, we compute the expected number of FRBs if they are
isotropically distributed on the sky w.r.t. Galactic position (i.e. local), and
if they are of extragalactic origin. We demonstrate that the relative detection
rates reject a local origin with a confidence of 99.96% (~3.6 sigma). The
extragalactic predictions provide a better agreement, however are still strong
discrepancies with the low-latitude detection rate at a confidence of 99.69%
(~2.9 sigma). However, for the extragalactic population, the differences in
predicted vs.~detected population may be accounted for by a number of factors,
which we discuss.
