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We integrate the publicly available O1 LIGO time-domain data to obtainmaximum-likelihood constraints on the Gravitational Wave Background (GWB)arising from stochastic, persistent signals. Our method produces sky-maps ofthe strain intensity $I$ as a function of direction on the sky at a referencefrequency $f_0$. The data is integrated assuming a set of fixed power-lawspectra for the signal. The maps provide upper limits on the amplitude of theGWB density $\Omega_{\rm GW}(f_0)$ and any anisotropy around the background. Wefind 95\% confidence upper limits of $\Omega_{\rm GW} < 4.8\times 10^{-7}$ at$f_0=50$ Hz with similar constraints on a dipole modulation for theinspiral-dominated stochastic background case.

Gravitational Wave Background Sky Maps from Advanced LIGO O1 Data