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The GMRT Epoch of Reionization (EoR) experiment is an ongoing effort tomeasure the power spectrum from neutral hydrogen at high redshift. We havepreviously reported an upper limit of (70 mK)^2 at wavenumbers of k=0.65 h/Mpcusing a basic piecewise-linear foreground subtraction. In this paper we explorethe use of a singular value decomposition to remove foregrounds with fewerassumptions about the foreground structure. Using this method we also quantify,for the first time, the signal loss due to the foreground filter and presentnew power spectra adjusted for this loss, providing a revised measurement of a2-sigma upper limit at (248 mK)^2 for k=0.50 h/Mpc. While this revised limit islarger than previously reported, we believe it to be more robust and stillrepresents the best current constraints on reionization at z=8.6.

A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment