SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati GB6 J2157+3126

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [Radio]      GB (Green Bank obs.) . . . . . . . . . =E= GB6 BHHMM+DDMMa
                                                      or GB6 JHHMM+DDMMa
 [Radio]      GB6 (Green Bank obs. 6cm survey) . . . =E= GB6 BHHMM+DDMMa
                                                      or GB6 JHHMM+DDMMa
=E= indicates catalogues available in electronic form at CDS