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We present Giant Metrewave Radio Telescope (GMRT) observations of redshifted21-cm absorption from the $z=0.437$ metal line absorption system towards PKS1243-072. HI absorption is clearly detected; the absorption profile has avelocity spread of $\sim 20$ km/s. Detection of 21-cm absorption indicates thatthe absorber has an HI column density large enough to be classified as a dampedLyman-$\alpha$ system. Follow up ground based optical imaging and spectroscopyallow us to identify the absorber with an $L \sim L^\star$ galaxy at an impactparameter of $\sim 9.8$ kpc from the line of sight to the QSO. The absorbinggalaxy is unusual in that it has bright emission lines. On the basis of theoptical spectrum we are unable to uniquely classify the galaxy since itsemission line ratios lie in the transition region between starburst and SeyfertII type spectra.Comment: 5 pages, 3 figures. Accepted for publication in Astronomy &  Astrophysic

A new 21-cm absorber identified with an $L \sim L^\star$ galaxy