Einstein/IPC ivo://nasa.heasarc/ipc NASA/GSFC HEASARC SAO 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This database contains information on sources detected with the Einstein Observatory Image Proportional Counter (IPC), assembled for the Einstein Observatory Catalog (EOSCAT) of IPC X-ray Sources (2E) and containing over 4000 unique sources (with 6539 separate detections) which were detected with the IPC at a level of significance greater than 3.5 sigma in the broad band (0.2-3.5 keV). This database also contains the list of 277 sources which are known not to have been included in the Einstein Observatory Source Catalog (flagged by supplement = 'Y' in this database). Those which were not detected during the standard Rev1B processing were typically discovered upon visual inspection of the contour diagrams in the Catalog. Others were detected with Rev1B standard processing but left out of the Catalog because of short exposure times or other reasons listed in the "missed_code" field. 258 of these 277 additional sources have no valid signal to noise ratio (SNR) estimate (values of 0.0), while 3 others have SNR values of 3.2 and 3.3, notice. This IPC database is based on NASA Astrophysics Data System (ADS) tables that were created in 1991 and 1993 and were themselves derived from tables provided by Dr. D. E. Harris of the Center for Astrophysics at Harvard-Smithsonian. The HEASARC has a similar catalog in its database called EINSTEIN2E which comprises a more recent version of the IPC source list as archived at the NASA Astronomical Data Center (ADC) and the Center for Astronomical Data at Strasbourg (CDS). EINSTEIN2E has 868 fewer detections than the IPC catalog, notice, for reasons that the HEASARC is unsure of, but that may imply that some of the detections in IPC are not reliable. We have retained the IPC database for reasons of completeness, but caution that detections listed here which have no counterpart in the EINSTEIN2E Catalog should be treated with caution. This IPC database was recreated by the HEASARC in December 2000 to replace a previous version in which we discovered some transcription errors. It is based on NASA Astrophysics Data System (ADS) tables that were created in 1991 and 1993 and were themselves derived from tables provided by Dr. D. E. Harris of the Center for Astrophysics at Harvard-Smithsonian: <pre> The Einstein IPC Source List From EOSCAT (ADS Creation Date: 26-Dec-1990; ADS Last Revision Date: 04-Nov-1993), D.E. Harris, CfA The EOSCAT List of Missed IPC Sources (ADS Creation Date: 26-Oct-1990; ADS Last Revision Date: 17-Sep-1991), D.E. Harris, CfA </pre> This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/ipc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ipc& GET text/xml 180 99999 true 283.67132615 -78.89363899 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ipc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ipc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 EINSTEIN 0.0333333333333333 X-ray public ipc Einstein IPC Sources Catalog name Designation derived from position meta.id char nullable sequence_num Einstein Observatory Sequence Number meta.id;meta.main int nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable count_rate Corrected Broad Band Count Rate ct/s phot.count;em.X-ray double nullable count_rate_error Corrected Count Rate Error ct/s stat.error;phot.count;em.X-ray double nullable snr Signal to Noise Ratio stat.snr double nullable off_axis Distance Off Axis (arcmin) arcmin instr.offset double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable broad_dec_rad Broadband Declination (radians, B1950) radian double nullable integration_area Integration Area for the Size Correction (pixels) pixel double nullable size_corr Size Correction Factor (Ratio of Counts) double nullable class Browse Object Classification src.class short nullable source_id Source Identification (Not Verified) char nullable lii Galactic Longitude degree pos.galactic.lon double nullable net_count Net PI-BROAD Cell Counts double nullable supplement Supplement Flag ([Y] == Added Source) char nullable rib_edge_codes Combined Rib-Edge Codes short nullable hardness_ratio Maximum Likelihood Hardness Ratio phot.flux;arith.ratio;em.X-ray double nullable broad_ra_rad Broadband Right Ascension (radians, B1950) radian double nullable rflag Rib Flag ([R] == Source Under Ribs) char nullable comments Comments on Added Sources char nullable error_radius Positional Uncertainty (arcsecs, B1950) arcsec stat.error;pos double nullable source_flags Combined Source Flags char nullable total_net_count Total Net Count within a 3-sigma Contour double nullable minus_uncert Minus Uncertainty of the Hardness Ratio double nullable detect_method Source Detection Method [LM] char nullable rel_correction Relative Exposure/Vignetting Correction double nullable global_designation Catalog Designation short nullable rev1b_num Rev 1B Source Number short nullable contours Number of Contour Levels short nullable bii Galactic Latitude degree pos.galactic.lat double nullable intensity Source Count Rate for Clusters (counts/sec) ct/s float nullable plus_uncert Plus Uncertainty of the Hardness Ratio double nullable missed_code Reason Not Originally Included [CELRT] char nullable eoscat_num EOSCAT Number short nullable background_count Background Cell Counts double nullable