SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati ZEH2003] RX J1706.5+2358 1

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [?]          HRC (Hamburg-RASS Catalogue) . . . . . =E= [ZEH2003] {RX} JHHMM.m+DDMM NN
 [?]          [ZEH2003] (Zickgraf+Engels+Hagen+ 2003) =E= [ZEH2003] {RX} JHHMM.m+DDMM NN
=E= indicates catalogues available in electronic form at CDS