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We present the first robust detection of HI 21 cm emission in the bluecompact galaxy Haro 11 using the 100m Robert C. Byrd Green Bank Telescope(GBT). Haro 11 is a luminous blue compact galaxy with emission in both LymanAlpha and the Lyman continuum. We detect (5.1 $\pm$ 0.7 $\times$10$^8$)M$_{\odot}$ of HI gas at an assumed distance of 88 Mpc, making this galaxy HIdeficient compared to other local galaxies with similar optical properties.Given this small HI mass, Haro 11 has an elevated M$_{H2}$/M$_{HI}$ ratio and avery low gas fraction compared to most local galaxies, and contains twice asmuch mass in ionized hydrogen as in neutral hydrogen. The HI emission has alinewidth of 71 kms$^{-1}$ and is offset 60 kms$^{-1}$ redward of the opticalline center. It is undergoing a starburst after a recent merger which haselevated the star formation rate, and will deplete the gas supply in $<$ 0.2Gyr. Although this starburst has elevated the SFR compared to galaxies withsimilar HI masses and linewidths, Haro 11 matches a trend of lower gasfractions toward higher star formation rates and is below the general trend ofincreasing HI mass with increasing luminosity. Taken together, our resultspaint Haro 11 as a standard low-mass galaxy that is undergoing an unusuallyefficient star formation episode.

Detection of HI in Emission in the Lyman Alpha Emitting Galaxy Haro 11