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Catalog of the 161 Uhuru Sources Observed by the Hard X-ray Experiment


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)


This catalog is a listing of observations made by the Hard X-Ray Experiment (HXX) on the ANS spacecraft (H. Gursky et al., Astrophys. J., v. 201, p. L.27, 1975) of the 161 X-ray sources listed in the 3rd Uhuru Catalog (R. Giacconi et al., Astrophys. J. Suppl., v. 27, p. 37, 1974). The order of the catalog table is by increasing right ascension. For each source, the data are divided into "low background" vs "high background." The data base from this experiment is still held by the original investigators (see NSSDC data set 74-070A-03A). The catalog can be used as an initial reference for parties interested in these data. It contains source identifications and information on the type and amount of data collected on each source.

Alternate Names

  • HXX Observing Catalog


  • Astronomy: X-Ray


  • 74-070A-03B

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Prof. Jonathan E. GrindlayData ProviderHarvard College Observatory
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