IX/4                Fourth UHURU Catalogue  (4U)             (Forman+ 1978)
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drwxr-xr-x 58 cats archive 4096 Jan 25 2021 [Up] drwxr-xr-x 2 cats archive 296 May 26 16:19 [TAR file] -rw-r--r-- 1 cats archive 448 Jul 31 2012 .message -r--r--r-- 1 cats archive 8023 Jul 31 2012 ReadMe -r--r--r-- 1 cats archive 52545 Jul 10 2012 4u.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 19718 Apr 18 1991 4u_ori.txt -rw-r--r-- 1 cats archive 573 Jul 31 2012 +footg5.gif -rw-r--r-- 1 cats archive 5907 Jul 31 2012 +footg8.gif
Beginning of ReadMe : IX/4 Fourth UHURU Catalogue (4U) (Forman+ 1978) ================================================================================ Fourth UHURU Catalogue Forman W., Jones C., Cominsky L., Julien P., Murray S., Peters G., Tananbaum H., Giacconni R. <Astrophys. J. Suppl. Ser. 38, 357 (1978)> =1978ApJS...38..357F ================================================================================ ADC_Keywords: X-ray sources Mission_Name: SAS-1 Keywords: X-rays: sources Abstract: The Fourth Uhuru (4U) Catalog lists 339 X-ray sources that were observed with the Uhuru (SAS A) X-ray observatory. It contains positional information in the form of 90% confidence level error boxes, 2-6keV intensities, possible optical and radio counterparts, and alternative names for sources observed in earlier compilations. The major classes of identified objects include binary stellar systems, supernova remnants, Seyfert galaxies, clusters of galaxies, and possibly the new class of superclusters of galaxies. The Uhuru satellite was a scanning X-ray instrument with a narrow (1 by 10 degree FWFM) and a wide (10 by 10 degree FWFM) collimator (cf. Giacconi et al. 1971ApJ...165L..27G). Typically, the scan rate was 0.5degree/second, with the spin axis in one position for roughly one day. During the interval for which the spin axis was fixed, repeated scans were made of the same 10 by 360 degrees band of the sky. For this catalog, the individual scans were superposed using aspect data from an orthogonally mounted triad of magnetometers and a Sun sensor onboard the spacecraft, supplemented by observations of well-located X-ray sources. The observations employed in producing this catalog were obtained over a total of 429 days between 1970 December 12 and 1973 March 18, apart from a gap between 1972 July and December when the spacecraft's transmitter was operating improperly. Description: 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.

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