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The rotational spectrum of erythrose has been recorded in the frequency region 6 -- 12~GHz using a chirped-pulse Fourier transform microwave spectrometer (CP-FTMW) \textbf{2008}, \textit{79}, 053103.} combined with a laser ablation (LA) source.a, C.~Cabezas, J.~C.~Lopez, J.~L.~Alonso, \textit{J. Mol. Spectrosc.} \textbf{2012}, \textit{280}, 91.} The investigation of rotational spectra of erythrose is of astrophysical and biological relevance. However, no gas-phase data were available on erythrose. It is syrup at room temperature and vaporization using conventional methods leads to decomposition. A non convetional laser ablation method has been successfully used to vaporize erythrose and two cyclic forms have been observed using rotational spectroscopy. $\alpha$-erythrose has been found to have rotational constants are $A=2586.8998$~(21)~MHz, $B=2353.0837$~(41)~MHz and $C=1773.2378$~(18)~MHz and $\beta$-erythrose is characterized with rotational constants $A=3109.2005$~(46)~MHz, $B=1856.1298$~(15)~MHz, $C=1616.5557$~(18)~MHz.