  The possible gamma ray burst occurred in location and temporal consistence
with gravitational wave event GW150914, as reported by Fermi Gamma-ray Burst
Monitor (GBM), offers a new way of constraining models with extra dimensions.
Using the time delay in arrival of the gamma ray transient observed by Fermi
GBM relative to the gravitational waves event triggered by the LIGO detectors
we investigate the size of the spherical brane-universe expanding in
multi-dimensional space-time. It is shown that a joint observation of
gravitational waves in association with gamma ray burst can provide a very
stringent bound on the spatial curvature of the brain.
