This catalogue contains observations which have been performed until the end of May 1993 and which are in the public archive. A visual inspection of all soft and hard images, and an automated screening process on the original so called master source lists (MASOL), have been used to remove confused sources and 124 observations with too crowded regions and regions of high surface brightness diffuse emission. The resulting 50,408 sources have a likelihood of at least 10, corresponding to a rate of accidental detections of about 1 percent. This data base contains 80% of all PSPC observations. Since the acceptance criteria were rather conservative a total number of about 70,000 X-ray sources detected during the pointed PSPC observation phase can be expected.
NAME ROSAT source name. ALTERNATE_NAME Alternate source name if given. RA Source right ascension DEC Source declination LII Source galactic longitude BII Source galactic lattitude SEQUENCE ROSAT observation sequence number ML_INDEX MASOL main running number ERROR_ML Positional accuracy: error radius of Maximum Likelihood algorithm (arcsec) ERROR_BOR Positional accuracy: boresight error ERROR_SYS Positional accuracy: systematic error ERROR_RADIUS Positional accuracy: total error OFFAXIS Off-axis radius in arcmin COUNTRATE Source counts per second (vignetting corrected) ECOUNTS Error on countrate BACKGROUND Background counts/sec/square arcmin EXPOSURE Exposure time in seconds (vignetting corrected) HARDNESS1 Hardness ratio 1. Defined as (B-A)/(B+A). EHARDNESS1 Error on hardness1. HARDNESS2 Hardness ratio 2. Defined as (D-C)/(D+C). EHARDNESS2 Error on hardness2. EXTENT Extent size in arcsec. EXTENTLIK Extent likelihood. ML_LIKE Likelihood from maximum-likelihood method MD_LIKE Likelihood of M-Detect algorithm. RIBDIST Distance to next rib or edge in arcsec SRCDIST Distance to next source in arcsec before screening SRCCDIST Distance to next source in arcsec after screening PRIORITY Source detection string. Each character describes the detection/non-detection in each of the different energy bands in the following order: detection flag in MDetect broad band detection flag in LDetect broad band detection flag in MDetect hard band detection flag in LDetect hard band detection flag in MDetect soft band detection flag in LDetect soft band detection flag (broad=b,....) CELL Detect cell size. VIGNETTING Vignetting correction factor. CONFUSION Confusion indicator. CLASS Browse classification