INTVARCAT ivo://nasa.heasarc/intvarcat NASA/GSFC HEASARC Telezhinsky et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source In 6 years of operation, INTEGRAL/ISGRI revealed more than 500 sources. Many of these sources are variable. Taking into account that nearly half of INTEGRAL/ISGRI sources are new and many of them are still unidentified, the variability properties of the sources can serve as additional parameters that may help to classify and identify the unknown sources. In order to study the variability properties of the sources detected by INTEGRAL/ISGRI, the authors have developed a method to quantify the variability of a source which is described in their paper. They have compiled a catalog of the sources that fit their criteria of variability. This catalog gives the values of fractional variability, the flux, and the corresponding 2-sigma errors of the sources from the INTEGRAL Reference Catalog (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/411/L59">CDS Cat. J/A+A/411/L59</a>, the HEASARC table INTVARCAT) version 30. The data are given for 3 energy bands: 20-40, 40-100, and 100-200 keV. The exposure times of the sources are given for each energy band only if the source was detected in the given band. This table also gives the source type according to the reference catalog. If the source is localized in more then one map then the weighted mean values of the flux and variability are given. The sources active during specific time periods and not detected at the total variability map are indicated with "b" letter in the source_flag parameter. The sources detected only in the total variability map are indicated with an "i" letter value for this parameter, while a letter "g" indicates that the source was affected by the "ghost" of another source. The map<sub>det</sub>* parameters specify the time period map(s) in which the source was visible, where the presence of an 'X' following a map number means that the source was not detected in the respective significance map, and that a lower limit for the fractional variability is given in such a case. This table was created by the HEASARC in December 2010 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/522/A68">CDS Catalog J/A+A/522/A68</a> file table3.dat. This is a service provided by NASA HEASARC . 2010A&A...522A..68T https://heasarc.gsfc.nasa.gov/W3Browse/all/intvarcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=intvarcat& GET text/xml 180 99999 true 19.27120833 -73.44333333 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=intvarcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_intvarcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 INTEGRAL 0.0833333333333333 X-ray public intvarcat INTEGRAL/ISGRI Catalog of Variable X-Ray Sources 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 flux_20_40kev_limit Limit Flag for Flux, Band 20-40keV meta.code;phot.flux;em.X-ray.hard char nullable flux_20_40kev Flux, Band 20-40keV 10^-11_erg/s/cm^2 phot.flux;em.X-ray.hard double nullable flux_20_40kev_error Error in Flux, Band 20-40keV 10^-11_erg/s/cm^2 stat.error;phot.flux;em.X-ray.hard double nullable var_20_40kev Fractional Variability, Band 20-40keV src.var.index double nullable source_type Catalog Source Classification src.class char 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 var_100_200kev_limit Limit Flag for Fractional Variability, Band 100-200keV meta.code;src.var.index char nullable var_40_100kev Fractional Variability, Band 40-100keV double nullable var_40_100kev_error Error in Fractional Variability, Band 40-100keV double nullable flux_100_200kev_error Error in Flux, Band 100-200keV 10^-11_erg/s/cm^2 stat.error;phot.flux;em.gamma.soft double nullable map_det_20_40kev Map Number(s) Where the Source Is Detected in 20-40keV Band meta.code;obs.field char nullable flux_100_200kev Flux, Band 100-200keV 10^-11_erg/s/cm^2 phot.flux;em.gamma.soft double nullable var_100_200kev_error Error in Fractional Variability, Band 100-200keV stat.error;src.var.index double nullable exposure_100_200kev Exposure Time, Band 100-200keV s double nullable class Browse Object Classification src.class short nullable bii Galactic Latitude degree pos.galactic.lat double nullable flux_40_100kev_error Error in Flux, Band 40-100 keV 10^-11_erg/s/cm^2 double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable flux_40_100kev Flux, Band 40-100 keV 10^-11_erg/s/cm^2 double nullable lii Galactic Longitude degree pos.galactic.lon double nullable exposure_20_40kev Exposure Time, Band 20-40keV s time.duration;obs.exposure;em.X-ray.hard double nullable exposure_40_100kev Exposure Time, Band 40-100keV s time.duration;obs.exposure;em.X-ray.hard double nullable source_flag [bgi ] Source peculiarities meta.code;src char nullable map_det_100_200kev Map Number(s) Where the Source Is Detected in 100-200keV Band meta.code;obs.field char nullable map_det_40_100kev Map Number(s) Where the Source Is Detected in 40-100keV Band meta.code;obs.field char nullable flux_100_200kev_limit Limit Flag for Flux, Band 100-200keV meta.code;phot.flux;em.gamma.soft char nullable var_20_40kev_error Error in Fractional Variability, Band 20-40keV stat.error;src.var.index double nullable var_20_40kev_limit Limit Flag for Fractional Variability, Band 20-40keV meta.code;src.var.index char nullable var_100_200kev Fractional Variability, Band 100-200keV src.var.index double nullable var_40_100kev_limit Limit Flag for Fractional Variability, Band 40-100keV char nullable flux_40_100kev_limit Limit Flag for Flux, Band 40-100 keV char nullable