ROSAT All-Sky Survey: Bright Sources

The ROSAT All-Sky Survey Bright Source Catalog (RASS-BSC, revision 1RXS) was released online at <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/">http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/</a> (cf. IAU Circular No. 6420, June 19, 1996). It has been superseded by the <a href="/W3Browse/rosat/rass2rxs.html">Second ROSAT All-Sky Survey Point Source Catalog (2RXS)</a>. This catalog was derived from the all-sky survey performed during the first half year of the ROSAT mission in 1990-1991; 18,811 sources are catalogued, with a limiting ROSAT PSPC countrate of 0.05 cts/s in the energy band 0.1- 2.4 keV. The sources have a detection likelihood of at least 15 and contain at least 15 source photons. At a brightness limit of 0.1 cts/s (8547 sources), the catalog represents a sky coverage of 92 percent. The ROSAT name, the position in equatorial coordinates, the positional error, the source countrate and error, the background countrate, exposure time, hardness-ratios HR1 and HR2 and errors, extent and likelihood of extent, and likelihood of detection are provided for each source. For 94 percent of the sources, visual inspection confirmed the results of the standard processing with respect to existence and position; the remaining 6 percent were reanalyzed and appropriately flagged. Broadband images are available for a subset of the flagged sources. This table was originally ingested by the HEASARC in June 1996, based upon the data files from <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/">http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/</a>. An updated version can be found in the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/IX/10A">CDS Catalog IX/10A</a>. This is a service provided by NASA HEASARC .

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  "Astrophysics"
]