VizieR Online Data Catalog: Fourth UHURU Catalogue (4U) (Forman+ 1978)

Positions and intensities are presented for 339 X-ray sources observed by the Uhuru (SAS-1) X-ray satellite observatory. Correspondances with the sources in the 3U and 2A catalogs are given. Optical and radio counterparts are suggested based on positional coincidence

This online catalog was created by the HEASARC in March 2003 based on a table obtained originally from the ADC website (ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/uhuru4/4u.dat), which was modified by the HEASARC to include some parameters that were in the published catalog (Table 1 in the reference) but were not in the ADC table. The HEASARC made a small number of other changes and corrections to the table which are listed in the HEASARC_Implementation section of this help. Notice that the ADC table itself differs in a number of respects from the published Table 1, e.g., the comments are sometimes abbreviated and/or different, some of the names are slightly different (usually by one digit in the RA minutes part), and three of the entries have differing names and positions.

(1 data file).