ASCAGIS ivo://nasa.heasarc/ascagis NASA/GSFC HEASARC Ueda et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This is the complete X-ray source catalog of the ASCA Medium Sensitivity Survey, AMSS, or the Gas Imaging Spectrometer (GIS) catalog project. It has been constructed from data for fields covering Galactic latitudes |b| > 10 degrees which were obtained with the GIS instrument onboard the ASCA satellite between 1993 May and 1996 December (part I) and between 1997 January and 2000 May (part II). Part I of this catalog (AMSS-I) utilizes 368 combined fields, and contains 1343 sources (including target sources) with detection significance above 5 sigma in at least one of the 3 survey bands of 0.7-7.0, 2-10, or 0.7-2.0 keV, while AMSS-II uses 306 fields, and contains a total of 1190 sources, using the same criteria. The AMSS-I and AMSS-II catalogs together contain 2533 sources from an area of 278 square degrees and provide a unique database of X-ray sources in the flux range of 10<sup>-13</sup> to 10<sup>-11</sup> erg cm<sup>-2</sup> s<sup>-1</sup> (0.7-10 keV). The published paper contains a summary of the statistical properties of a complete X-ray sample consisting of 1969 serendipitous sources selected from AMSS-I and AMSS-II. For each source, the ASCA source name, position, 90% error radius, count rates (both observed and as corrected for Galactic absorption) in the 3 energy bands, detection signifances and fluxes in the 3 energy bands, and hardness ratio and associated error are provided. This version of the Browse ASCAGIS table containing the combined AMSS-I and AMSS-II source lists was created by the HEASARC in February 2006 based on the CDS version of the AMSS-I source list (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/133/1">CDS catalog J/ApJS/133/1</a>) and the electronic ApJS version of the AMSS-II source list. This is a service provided by NASA HEASARC . 2005ApJS..161..185U https://heasarc.gsfc.nasa.gov/W3Browse/all/ascagis.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ascagis& GET text/xml 180 99999 true 150.9813 -85.2805 0.05 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ascagis GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ascagis&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ASCA 0.05 X-ray public ascagis ASCA GIS Source Catalog (AMSS-I + AMSS-II) name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable error_radius The 90% Error Radius arcmin stat.error;pos float nullable count_rate_total The 0.7-7 keV Count Rate (ct/s) ct/s phot.count;em.X-ray double nullable snr_total The 0.7-7 keV Detection Significance stat.snr 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 corr_count_rate_total Corrected 0.7-7 keV Count Rate (ct/s) ct/ks phot.count;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable flux_total The 0.7-7 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray double nullable field_id Field Identification char nullable target_flag Flag Indicates the Source Was the Target of the ASCA Observation char nullable snr_hard The 2-10 keV Detection Significance stat.snr;em.X-ray.medium double nullable hr1_error Uncertainty in Hardness Ratio stat.error;phot.flux;arith.ratio double nullable lii Galactic Longitude degree pos.galactic.lon double nullable flux_soft The 0.7-2 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable corr_count_rate_soft Corrected 0.7-2 keV Count Rate (ct/s) ct/ks phot.count;em.X-ray.soft double nullable count_rate_hard The 2-10 keV Count Rate (ct/s) ct/s phot.count;em.X-ray.medium double nullable flux_hard The 2-10 keV Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable snr_soft The 0.7-7 keV Detection Significance stat.snr;em.X-ray.soft double nullable hr1 Hardness Ratio phot.flux;arith.ratio double nullable count_rate_soft The 0.7-2 keV Count Rate (ct/s) ct/s phot.count;em.X-ray.soft double nullable catalog_part Flag Indicates from Which Part of the Catalog the Entry Originates char nullable duplicate_source Flag Indicates Entry Is a Duplicate Source char nullable corr_count_rate_hard Corrected 2-10 keV Count Rate (ct/s) ct/ks phot.count;em.X-ray.medium double nullable