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The locations of Ly-$\alpha$ emitting galaxies (LAEs) at the end of the Epochof Reionisation (EoR) are expected to correlate with regions of ionisedhydrogen, traced by the redshifted 21~cm hyperfine line. Mapping the neutralhydrogen around regions with detected and localised LAEs offers an avenue toconstrain the brightness temperature of the Universe within the EoR byproviding an expectation for the spatial distribution of the gas, therebyproviding prior information unavailable to power spectrum measurements. We usea test set of 12 hours of observations from the Murchison Widefield Array (MWA)in extended array configuration, to constrain the neutral hydrogen signature of58 LAEs, detected with the Subaru Hypersuprime Cam in the \textit{Silverrush}survey, centred on $z$=6.58. We assume that detectable emitters reside in thecentre of ionised HII bubbles during the end of reionization, and predict theredshifted neutral hydrogen signal corresponding to the remaining neutralregions using a set of different ionised bubble radii. A prewhitening matchedfilter detector is introduced to assess detectability. We demonstrate theability to detect, or place limits upon, the amplitude of brightnesstemperature fluctuations, and the characteristic HII bubble size. With ourlimited data, we constrain the brightness temperature of neutral hydrogen to$\Delta{\rm T}_B<$30 mK ($<$200 mK) at 95% (99%) confidence forlognormally-distributed bubbles of radii, $R_B =$ 15$\pm$2$h^{-1}$cMpc.

Constraining the 21cm brightness temperature of the IGM at $z$=6.6 around LAEs with the Murchison Widefield Array