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    PR # 32108                                                                   
     We propose to investigate the X-ray spectral properties of the five         
     X-ray bursters which have shown hard X-ray emission ($\geq$ 150 keV)        
     in SIGMA observations, namely KS1731-260, X1734-308 in Terzan 2, SLX1       
     732-304  in Terzan 1, A1742-294, and finally GX354-0. These sources         
              are all low-luminosity systems ($L_x \leq 10^{37}$ ergs s$^{       
     -1}$), and have been poorly studied in X-rays. With ASCA, we will ans       
     wer the    following questions {\it 1)} Do these sources define a new       
      class of  neutron star systems? {\it 2)} How do their properties com       
     pare with those of the better-studied bursters with power-law tails i       
     n X-rays? and {\it 3)} Can we constrain the origin of hard X-ray emis       
     sion as required for   on-going theoretical investigations? ASCA, tha       
    nks to its improved sensitivit                                               
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