Swift-XRT Point Source Catalog (2SXPS)

Swift-XRT Point Source Catalog (2SXPS) SWIFT2SXPS ivo://nasa.heasarc/swift2sxps NASA/GSFC HEASARC Evans et al. 2026-06-19 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the second Swift X-ray Point Source (2SXPS) catalog of detections by the Swift X-ray Telescope (XRT) used in Photon Counting (PC) mode in the 0.3-10 keV energy range. Swift is a NASA mission with international participation dedicated to the gamma-ray burst study. It carries three instruments. The BAT is the large field-of-view instrument and operates in the 10-300 keV energy band; and two narrow field instruments, XRT and UVOT, that operate in the X-ray and UV/optical regime, respectively. The overall 2SXPS catalog characteristics are as follows: <pre> Data included 2005 Jan 01 - 2018 August 01 Sky coverage 3,790 square degrees Typical Sensitivity (0.3-10 keV) 2x10-13 erg cm-2 s-1 (observations) 4x10-14 erg cm-2 s-1 (stacked images) Typical position error 5.6" (90% confidence radius, including systematics) Detections 1,091,058 Unique sources 206,335 Variable sources 82,324 Uncatalogued sources 78,100 False positive rate Flag=Good 0.3% Flag=Good/Reasonable 1% Flag=Good/Reasonable/Poor <10% </pre> This catalog enhances the 1SXPS catalogue (Evans, P. A., et al. 2014, ApJS, 210, 8) in different ways. The 2SXPS catalog uses an improved Point Spread Function (PSF) and pile-up models, a better source detection pipeline that includes a technique to model the effects of stray light, and tests to automatically avoid diffuse emission and ~six years more data. The results are that the 2SXPS catalog contains 50% more temporal coverage than 1SXPS, a sky coverage of 3790 square deg almost double compare to the 1SXPS (1905 square Degree) and ~30% more sources compared to the 1SXPS. The Swift XRT observations were filtered to remove times when: a) data were contaminated by scattered light from the daylight side of the Earth; b) the on-board astrometry derived from the images obtained by the Swift UV/Optical telescope was unreliable; and c) observations with less than 100s of PC mode. The 127519 observations included in the catalog provide a total usable exposure is 266.5 Ms. A Swift observation is a collection of snapshots and the source detection algorithm was run on individual observation as well as on stacked images. The latter were generated on a grid of 2,300x2,300 pixels (~ 90'x90') to ensure that every overlap between observations is in at least one stacked image. A total of 14628 stacked images were generated. Each record corresponds to a unique source which characteristics are described with 230 parameters. The catalog reports for each source rates in four energy band (0.3-10.keV, 0.3-1. keV, 1-2 keV and 3-10 keV), background rates, variability for each energy band, two hardness ratio, peak rate and several spectral parameters. The hardness ratios are defined as follows: <pre> HR1 = (M-S)/(M+S) where M and S are the medium (1-2 keV) and soft (0.3-1 keV) band count rates HR2 = (H-M)/(H+M) where H and M are the hard (2-10 keV) and medium (1-2 keV) band count rates </pre> and they are calculated using all observations. The peak rate is determined using three different timescale: the count rate considering all the observations (see parameters rates in this database), the count rate in each observation (not reported in this database) and the count rate in each snapshot (not reported in this database). The peak rate is the rate +/- error from the timescale which has the highest 1-sigma lower-limit on the count rate. Spectral parameters and source flux are estimated using three different methods for two spectral models, a power-law and APEC (see Smith et al., 2001, ApJL, 556, L91). Not all sources have values for all three methods. The parameters starting with "fix" are defined for every source and uses fixed spectral model parameters: a photon index of 1.7 for a power-law model, a temperature of kT=1keV for the APEC model and for both models uses the Galactic absorption listed in the parameter "nh". The parameters starting "intr" have been inferred from the hardness ratio. Look-up tables containing (HR1, HR2, NH, photon index) and (HR1, HR2, NH, kT) are pre-calculated for the power-law and APEC models. If the source HR1 and HR2 are close to the values in the table, spectral parameters are derived by interpolating the HR1 and HR2 in the look-up tables that are close to the HR1 and HR2 of the source. The parameters starting with "fit" have been derived from fitting an actual source spectrum in XSPEC and they are only available for the brightest sources (>50 net counts, and at least one detection in a single observation). The parameters fields starting with "pow" and "apec" report the values from the 'best' of these methods. The parameters "which_pow" and "which_apec" indicates which of the three methods are reported. The catalog also includes flags derived from the cross-correlated with other source catalogs. The catalogs and their reference sources are as follows: <pre> * AllWISE: <a href="https://wise2.ipac.caltech.edu/docs/release/allwise/">https://wise2.ipac.caltech.edu/docs/release/allwise/</a> * ROSAT HRI: <a href="https://heasarc.gsfc.nasa.gov/docs/rosat/rra/RRA.html">https://heasarc.gsfc.nasa.gov/docs/rosat/rra/RRA.html</a> * SDSS Quasar Catalog DR14: Paris et al., 2018, A&A, 613, 51 (<a href="https://www.sdss.org/dr14/algorithms/qso_catalog/">https://www.sdss.org/dr14/algorithms/qso_catalog/</a>) * 2MASS: Skrutskie et al., 2006, AJ, 131, 1163 * 2CSC: accessed via the CSCView Tool at <a href="https://cxc.harvard.edu/csc/about.html">https://cxc.harvard.edu/csc/about.html</a> (1CSC paper: Evans et al., 2010, ApJS, 189, 37) * 1SWXRT: Evans et al., 2014, ApJS, 210,8 * 1SXPS: D'Elia et al., 2013, A&A, 551, 142 * 2RXS: Boller et al., 2016, A&A, 588, 103 * 3XMM-DR8: <a href="http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR8/3XMM_DR8.html">http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR8/3XMM_DR8.html</a> (3XMM paper: Rosen, Webb, Watson et al., 2016, A&A, 590, 1) * 3XMM Stack: Traulsen et al., 2019, A&A, 642, 77 * SwiftFT: Puccetti et al. 2011, A&A,528, A122 * XMM SL2: Saxton et al., 2008, A&A 480, 611 * XRTGRB: Evans et al, 2009, MNRAS, 397, 1177 (<a href="https://www.swift.ac.uk/xrt_positions">https://www.swift.ac.uk/xrt_positions</a>) * USNOB1: Monet et al., 2003, AJ, 125, 984 </pre> The 2SXPS paper (Evans et al. 2020 ApJS, 247,54) describes in detail the methodology of stacking images, background modeling, point spread function mapping, stray light detection and corrections, data filtering techniques and processing. The 2SXPS catalog has a dedicated website at <a href="https://www.swift.ac.uk/2SXPS">https://www.swift.ac.uk/2SXPS</a>. This database table was created by the HEASARC in November 20201 based on the electronic version delivered to the HEASARC by the Leicester University. The catalog has a dedicated website at <a href="https://www.swift.ac.uk/2SXPS">https://www.swift.ac.uk/2SXPS</a>. The version available from the HEASARC corresponds to the catalog designated as "All" on the Leicester website. This is a service provided by NASA HEASARC . 2020ApJS..247...54E https://heasarc.gsfc.nasa.gov/W3Browse/all/swift2sxps.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=swift2sxps& GET text/xml 180 99999 true 133.29574 -89.82855 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=swift2sxps GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_swift2sxps&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SWIFT 0.0166666666666667 X-ray public swift2sxps Swift-XRT Point Source Catalog (2SXPS) name IAU-Style Source Designation (2SXPS JHHMMSS.s+DDMM.m) 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 90%-Confidence Radial Position Error degree stat.error;pos double nullable count_rate_fb Total Band (0.3-10 keV) Count Rate ct/s phot.count;em.X-ray double nullable count_rate_fb_pos_err Positive Error on Total Band (0.3-10 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray double nullable count_rate_fb_neg_err Negative Error on Total Band (0.3-10 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray double nullable pow_flux_a Observed 0.3-10 keV Flux for Power-Law Spectrum erg/cm^2/s phot.flux;em.X-ray double nullable pow_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable pow_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable apec_flux_a Observed 0.3-10 keV Flux derived from APEC erg/cm^2/s phot.flux;em.X-ray double nullable apec_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable apec_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable count_hb Number of Events in Hard Band (2-10 keV) Source Extraction Region ct phot.count;em.X-ray.hard int nullable prbcnst_mb Probability Source Constant Between Observations in Medium Band (1-2 keV) src.var.index double nullable detect_flag Best Detection Flag from All Detections of the Source (Bit Mask Flag) meta.code.qual;em.X-ray short nullable intr_pow_nh_pos_err Positive Error Absorption Column Based on HR-Interpolated Power-Law cm^-2 stat.error;stat.max;phys.columnDensity double nullable hardness_ratio_2_pos_err Positive Error on HR2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable fix_pow_flux_a_pos_err Positive Error Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable intr_apec_kt_pos_err Positive Error on APEC Plasma Temperature for HR-Interpolated APEC Spectrum keV stat.error;stat.max;phys.temperature;stat.fit.param;meta.modelled double nullable pkrate_sb_pos_err Positive Error on Peak Soft Band (0.3-1 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray.soft double nullable ctrpart_offset_good Distance to the Nearest 2SXPS Source with Good Flag arcsec pos.angDistance double nullable bkgcnt_mb Counts in 1-2 keV Background Map from Source Extraction Region ct phot;instr.background;em.X-ray double nullable count_rate_mb_neg_err Negative Error on Medium Band (1-2 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray double nullable fit_apec_nh_pos_err Positive Error Absorption Column for Automated APEC cm^-2 stat.error;stat.max;phys.columnDensity double nullable intr_apec_flux_a Observed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s phot.flux;em.X-ray double nullable fix_apeccf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for APEC erg/cm^2/s instr.param double nullable intr_pow_gam_pos_err Positive Error of Power-Law Index Based on HR-Interpolated Power-Law stat.error;stat.max;spect.index double nullable num_matches Number of Sources with Catalog Cross Matches meta.number int nullable intr_pow_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for HR-Interpolated Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable fit_apec_flux_a Observed 0.3-10 keV Flux for Automated APEC erg/cm^2/s phot.flux;em.X-ray double nullable "time" Start Time of the First Observation of Source in 2SXPS mjd time.start;obs double nullable cat_1swxrt_flag Object Appears in 1SWXRT Catalog meta.code.member short nullable time_determine_met Start MET of 1st Obs. in Blind Search or Retrospective Count-Rate Determination s time.start int nullable pkrate_fb Peak Count Rate of the Source in Total Band (0.3-10 keV) ct/s phot.count;em.X-ray double nullable intr_apec_kt APEC Plasma Temperature for HR-Interpolated APEC keV phys.temperature;stat.fit.param;meta.modelled double nullable fit_powcf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for Automated Power-Law instr.param double nullable intr_apec_flux_b Unabsorbed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s phot.flux;em.X-ray double nullable fit_pow_chisq Reduced Chi-Squared of best Fitting Automated Power-Law stat.fit.chi2 double nullable cat_usnob1_flag Object Appears in USNO-B1 Catalog meta.code.member short nullable fit_apec_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for Automated APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable fit_pow_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable count_rate_sb_pos_err Positive Error on Soft Band (0.3-1 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray.soft double nullable intr_pow_flux_b Unabsorbed 0.3-10 keV Flux Based on HR-Interpolated Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable source_number Unique Numerical Identifier for Each Source in This Catalog meta.id;src int nullable fix_apec_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable intr_apeccf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for HR-Interpolated APEC erg/cm^2/s instr.param double nullable exposure Total Exposure Time s time.duration;obs.exposure int nullable fit_apec_cstat C-Statistic from the Automated APEC Spectral Fit stat.fit.param double nullable num_blind_obs Number of Observations and Stacked Images with Source Detected in Blind Search meta.number int nullable fit_pow_flux_a Observed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable powcf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion erg/cm^2/s instr.param double nullable error_radius_ori Original Radial Position Error from First 2SXPS Release degree stat.error;pos double nullable num_determine_obs Number of Obs. and Stacked Images with Source Detected in Retrospective Analysis meta.number int nullable count_rate_mb_upper Overall 3-Sigma Upper Limit Medium Band (1-2 keV) Count Rate ct/s phot.count;stat.max;em.X-ray double nullable pkrate_sb Peak Count Rate of the Source in Soft Band (0.3-1 keV) ct/s phot.count;em.X-ray.soft double nullable cat_3xmmdr8_flag Object Appears in 3XMM-DR8 Catalog meta.code.member short nullable count_rate_hb Hard Band (2-10 keV) Count Rate of the source ct/s phot.count;em.X-ray.hard double nullable fix_pow_flux_a Observed 0.3-10 keV Flux for Power-Law with nH Absorption erg/cm^2/s phot.flux;em.X-ray double nullable fit_apeccf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for Automated APEC erg/cm^2/s instr.param double nullable pkrate_hb Peak Count Rate of the Source in Hard Band (2-10 keV) ct/s phot.count;em.X-ray.hard double nullable rate_hb_flag Flag for Mean Count Rate in Hard Band (2-10 keV) Non-Zero meta.code short nullable fit_powcf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for Automated Power-Law instr.param double nullable pow_pkflux_a_neg_err Negative Error on Peak Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable fit_pow_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable count_rate_fb_upper Overall 3-Sigma Upper Limit Total Band (0.3-10 keV) Count Rate ct/s phot.count;stat.max;em.X-ray double nullable end_time_blind_met End MET of Last Observation of Source Detected in Blind Search s time.end int nullable cat_swiftft_flag Object Appears in SwiftFT Catalog meta.code.member short nullable fit_apec_flux_b Unabsorbed 0.3-10 keV Flux for Automated APEC erg/cm^2/s phot.flux;em.X-ray double nullable ratecf_sb Count Rate Correction Factor in Soft Band (0.3-1 keV) instr.param double nullable bkgcnt_hb Counts in 2-10 keV Background mao from Source Extraction Region ct phot;instr.background;em.X-ray.hard double nullable off_axis Angular Distance from Center of XRT Detector to Source arcmin instr.offset;stat.mean double nullable intr_apec_kt_neg_err Negative Error on APEC Plasma Temperature for HR-Interpolated APEC keV stat.error;stat.min;phys.temperature;stat.fit.param;meta.modelled double nullable fit_apec_chisq Reduced Chi-Squared Value of Best-Fitting Automated APEC stat.fit.chi2 double nullable pow_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable intr_apec_nh Absorption Column for HR-Interpolated APEC cm^-2 phys.columnDensity double nullable prbcnst_fb Probability Source Constant Between Observations in Total Band (0.3-10 keV) src.var.index double nullable fit_apec_kt_neg_err Negative Error on APEC Plasma Temperature for Automated APEC keV stat.error;stat.min;phys.temperature;stat.fit.param;meta.modelled double nullable fix_powcf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for Power-Law erg/cm^2/s instr.param double nullable count_fb Number of Events in Total Band (0.3-10 keV) Source Extraction Region ct phot.count;em.X-ray int nullable num_matches_reduced Number of Sources with Catalog Cross Matches, Excluding 2MASS/USNO-B1/ALLWISE meta.number int nullable ratecf_mb Count Rate Correction Factor in Medium Band (1-2 keV) instr.param double nullable hardness_ratio_2 Hardness Ratio HR2 (H-M/H+M) phot.flux;arith.ratio;em.X-ray double nullable fit_apec_nh_neg_err Negative Error Absorption Column for Automated APEC cm^-2 stat.error;stat.min;phys.columnDensity double nullable ctrpart_offset Distance to the Nearest 2SXPS Source arcsec pos.angDistance double nullable prbcnst_hb Probability Source Constant Between Observations in Hard Band (2-10 keV) src.var.index double nullable pow_pkflux_a_pos_err Positive Error on Peak Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable fix_pow_flux_b_neg_err Negative Error Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable pkrate_hb_pos_err Positive Error on Peak Hard Band (2-10 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray.hard double nullable cat_roshri_flag Object Appears in ROSAT HRI Catalog meta.code.member short nullable bii Galactic Latitude degree pos.galactic.lat double nullable end_time_determine_met End MET of Last Obs. in Blind Search or Retrospective Count-Rate Determination s time.end int nullable det_mb_flag Best Medium Band (1-2 keV) Detection Flag from All Detections of the Source meta.code.qual;em.X-ray short nullable apec_pkflux_a_pos_err Positive Error on Peak Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable apeccf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for APEC erg/cm^2/s instr.param double nullable count_rate_sb_neg_err Negative Error on Soft Band (0.3-1 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray.soft double nullable fit_pow_dof Degrees of Freedom in Automated Power-Law stat.fit.dof int nullable powcf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion erg/cm^2/s instr.param double nullable apec_pkflux_b Peak Unabsorbed 0.3-10 keV Flux for APEC Spectrum erg/cm^2/s phot.flux;em.X-ray double nullable cat_xmmsl2_flag Object Appears in XMMSL2 Catalog meta.code.member short nullable intr_pow_gam Power-Law Index Based on HR-Interpolated Power-Law spect.index double nullable stray_flag Stray Light Flag meta.code;phot short nullable hardness_ratio_1_neg_err Negative Error on HR1 stat.error;phot.flux;arith.ratio;em.X-ray double nullable count_rate_mb Medium Band (1-2 keV) Count Rate of the source ct/s phot.count;em.X-ray double nullable rate_fb_flag Flag for Mean Count Rate in Total Band (0.3-10 keV) Non-Zero meta.code short nullable fix_powcf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for Power-Law erg/cm^2/s instr.param double nullable fit_apec_nh Absorption Column for Automated APEC cm^-2 phys.columnDensity double nullable lii Galactic Longitude degree pos.galactic.lon double nullable intr_pow_flux_a Observed 0.3-10 keV Flux Based on HR-Interpolated Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable prbcnst_snap_sb Probability Source Constant Between Snapshots in Soft Band (0.3-1 keV) src.var.index double nullable end_time_determine End of Obs. in Blind Search or Retrospective Count-Rate Determination mjd time.end double nullable optical_load Worst Optical Load Limit Exceeded mag phot.mag double nullable pow_flux_b Unabsorbed 0.3-10 keV Flux for Power-Law Spectrum erg/cm^2/s phot.flux;em.X-ray double nullable count_mb Number of Events in Medium Band (1-2 keV) Source Extraction Region ct phot.count;em.X-ray int nullable fit_pow_flux_b Unabsorbed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable which_pow Flag for Which Power-Law Spectral and Fluxes Are Given meta.code short nullable pkrate_fb_pos_err Positive Error on Peak Total Band (0.3-10 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray double nullable apec_pkflux_a_neg_err Negative Error on Peak Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable intr_pow_nh_neg_err Negative Error Absorption Column Based on HR-Interpolated Power-Law cm^-2 stat.error;stat.min;phys.columnDensity double nullable num_obs Number of Observations and Stacked Images Including Non-Detections meta.number;obs int nullable field_flag Best Field Flag from All Detections of the Source (Bit Mask Flag) meta.code short nullable prbcnst_snap_hr_2 Probability Source HR2 Hardness Ratio Constant Between Snapshots src.var.index double nullable cat_xrtgrb_flag Object Matches a Cataloged XRT Gamma-Ray Burst Position meta.code.member short nullable intr_pow_gam_neg_err Negative Error of Power-Law Index Based on HR-Interpolated Power-Law stat.error;stat.min;spect.index double nullable prbcnst_snap_hb Probability Source Constant Between Snapshots in Hard Band (2-10 keV) src.var.index double nullable nh Galactic Neutral Hydrogen Absorption Column Density cm^-2 phys.columnDensity double nullable fit_apec_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for Automated APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable time_blind_met Start MET of First Observation of Source Detected in Blind Search s time.start int nullable time_met Start MET of the First Observation of Source in 2SXPS (Swift MET) s time.start int nullable fit_apec_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for Automated APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable count_rate_hb_upper Overall 3-Sigma Upper Limit Hard Band (2-10 keV) Count Rate ct/s phot.count;stat.max;em.X-ray.hard double nullable pow_pkflux_b Peak Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable hardness_ratio_1_pos_err Positive Error on HR1 stat.error;phot.flux;arith.ratio;em.X-ray double nullable apec_pkflux_b_neg_err Negative Error on Peak Unabsorbed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable count_rate_mb_pos_err Positive Error on Medium Band (1-2 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray double nullable det_fb_flag Best Total Band (0.3-10 keV) Detection Flag from All Detections of the Source meta.code.qual;em.X-ray short nullable trackers_flag Flag Indicates Astrometry Source (0 for Swift Star Trackers, 1 for 2MASS) meta.code;pos short nullable intr_apec_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable rate_sb_flag Flag for Mean Count Rate in Soft Band (0.3-1 keV) Non-Zero meta.code short nullable pkrate_fb_neg_err Negative Error on Peak Total Band (0.3-10 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray double nullable prbcnst_hr_2 Probability Source HR2 Hardness Ratio Constant Between Observations src.var.index double nullable apec_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable intr_apeccf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for HR-Interpolated APEC erg/cm^2/s instr.param double nullable end_time_met End MET of the Last Observation of Source in 2SXPS (Swift MET) s time.end int nullable fix_apec_flux_a Observed 0.3-10 keV Flux for APEC erg/cm^2/s phot.flux;em.X-ray double nullable intr_pow_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for HR-Interpolated Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable intr_apec_nh_pos_err Positive Error Absorption Column for HR-Interpolated APEC cm^-2 stat.error;stat.max;phys.columnDensity double nullable fix_apec_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable fix_pow_flux_b Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s phot.flux;em.X-ray double nullable ratecf_fb Count Rate Correction Factor in Total Band (0.3-10 keV) instr.param double nullable prbcnst_snap_hr_1 Probability Source HR1 Hardness Ratio Constant Between Snapshots src.var.index double nullable apec_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for the APEC Spectrum erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable pkrate_mb Peak Count Rate of the Source in Medium Band (1-2 keV) ct/s phot.count;em.X-ray double nullable time_blind Start Time of First Observation of Source Detected in Blind Search mjd time.start double nullable fix_apeccf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for APEC erg/cm^2/s instr.param double nullable rate_mb_flag Flag for Mean Count Rate in Medium Band (1-2 keV) Non-Zero meta.code short nullable intr_powcf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for HR-Interpolated Power-Law erg/cm^2/s instr.param double nullable which_apec Flag for Which APEC Spectral and Fluxes Are Given meta.code short nullable det_hb_flag Best Hard Band (2-10 keV) Detection Flag from All Detections of the Source meta.code.qual;em.X-ray.hard short nullable fix_apec_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable pkrate_mb_neg_err Negative Error on Peak Medium Band (1-2 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray double nullable intr_powcf_flux_b Counts-to-Unabs.-Flux (0.3-10 keV) Conversion for HR-Interpolated Power-Law erg/cm^2/s instr.param double nullable count_sb Number of Events in Soft Band (0.3-1 keV) Source Extraction Region ct phot.count;em.X-ray.soft int nullable count_rate_hb_pos_err Positive Error on Hard Band (2-10 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray.hard double nullable end_time_blind End Time of Last Observation of Source Detected in Blind Search mjd time.end double nullable pow_pkflux_a Peak Observed 0.3-10 keV Flux for Power-Law Spectrum erg/cm^2/s phot.flux;em.X-ray double nullable hardness_ratio_2_neg_err Negative Error on HR2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable cat_2rxs_flag Object Appears in 2RXS Catalog meta.code.member short nullable intr_apec_nh_neg_err Negative Error Absorption Column for HR-Interpolated APEC cm^-2 stat.error;stat.min;phys.columnDensity double nullable fit_apec_kt APEC Plasma Temperature for Automated APEC keV phys.temperature;stat.fit.param;meta.modelled double nullable cat_allwise_flag Object Appears in ALLWISE Catalog meta.code.member short nullable fit_apec_kt_pos_err Positive Error on APEC Plasma Temperature for Automated APEC keV stat.error;stat.max;phys.temperature;stat.fit.param;meta.modelled double nullable apec_pkflux_a Peak Observed 0.3-10 keV Flux for APEC erg/cm^2/s phot.flux;em.X-ray double nullable fix_apec_flux_b Unabsorbed 0.3-10 keV Flux derived for APEC erg/cm^2/s phot.flux;em.X-ray double nullable hardness_ratio_1 Hardness Ratio HR1 (M-S/M+S) phot.flux;arith.ratio;em.X-ray double nullable bkgcnt_fb Counts in 0.3-10 keV Background Map from Source Extraction Region ct phot;instr.background;em.X-ray double nullable fit_pow_gam Power-Law Index for Automated Power-Law spectra spect.index double nullable cat_3xmm_stack_flag Object Appears in 3XMM-DR7 Catalog meta.code.member short nullable apec_flux_b Unabsorbed 0.3-10 keV Flux derived from the APEC erg/cm^2/s phot.flux;em.X-ray double nullable best_detect_id ID from Detections Table from Which Position and Error Have Been Taken meta.id;obs int nullable intr_apec_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable apeccf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for APEC erg/cm^2/s instr.param double nullable count_rate_sb Soft Band (0.3-1 keV) Count Rate ct/s phot.count;em.X-ray.soft double nullable fit_pow_nh_pos_err Positive Error Absorption Column for Automated Power-Law cm^-2 stat.error;stat.max;phys.columnDensity double nullable time_determine Start of First Obs. in Blind Search or Retrospective Count-Rate Determination mjd time.start double nullable fit_apec_dof Degrees of Freedom in Automated APEC stat.fit.dof int nullable fit_pow_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable fit_apeccf_flux_a Counts-to-Obs.-Flux (0.3-10 keV) Conversion for Automated APEC erg/cm^2/s instr.param double nullable prbcnst_snap_mb Probability Source Constant Between Snapshots in Medium Band (1-2 keV) src.var.index double nullable prbcnst_sb Probability Source Constant Between Observations in Soft Band (0.3-1 keV) src.var.index double nullable fix_apec_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable cat_2csc_flag Object Appears in 2CSC (Chandra) Catalog meta.code.member short nullable end_time End Time of the Last Observation of Source in 2SXPS mjd time.end;obs double nullable cat_1sxps_flag Object Appears in 1SXPS Catalog meta.code.member short nullable spec_flag Flag for Automated Build Spectrum for This Source meta.code;spect short nullable pkrate_sb_neg_err Negative Error on Peak Soft Band (0.3-1 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray.soft double nullable cat_2mass_flag Object Appears in 2MASS Catalog meta.code.member short nullable fit_pow_gam_pos_err Positive Error on Power-Law Index for Automated Power-Law stat.error;stat.max;spect.index double nullable pow_pkflux_b_pos_err Positive Error on Peak Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable prbcnst_hr_1 Probability Source HR1 Hardness Ratio Constant Between Observations src.var.index double nullable ratecf_hb Count Rate Correction Factor in Hard Band (2-10 keV) instr.param double nullable count_rate_sb_upper Overall 3-Sigma Upper Limit Soft Band (0.3-1 keV) Count Rate ct/s phot.count;stat.max;em.X-ray.soft double nullable intr_apec_flux_b_pos_err Positive Error on Unabsorbed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable prbcnst_snap_fb Probability Source Constant Between Snapshots in Total Band (0.3-10 keV) src.var.index double nullable fit_pow_nh_neg_err Negative Error Absorption Column for Automated Power-Law cm^-2 stat.error;stat.min;phys.columnDensity double nullable fit_pow_flux_a_pos_err Positive Error on Observed 0.3-10 keV Flux for Automated Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable intr_pow_flux_a_pos_err Positive Error of Observed 0.3-10 keV Flux Based on HR-Interpolated Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable fit_pow_gam_neg_err Negative Error on Power-Law Index for Automated Power-Law stat.error;stat.min;spect.index double nullable fit_pow_cstat C-Statistic from Automated Power-Law Spectral Fit stat.fit.param double nullable pow_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable det_sb_flag Best Soft Band (0.3-1 keV) Detection Flag from All Detections of the Source meta.code.qual;em.X-ray.soft short nullable alias_list List of Potential Alias Source IDs meta.id char nullable bkgcnt_sb Counts in 0.3-1 keV Background Map from Source Extraction Region ct phot;instr.background;em.X-ray.soft double nullable prob_apec Probability for a Source with APEC from Hardness Ratios stat.probability double nullable pow_pkflux_b_neg_err Negative Error on Peak Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable bright_flag Nearby Bright Source Flag meta.code;phot short nullable apec_pkflux_b_pos_err Positive Error on Peak Unabsorbed 0.3-10 keV Flux for APEC erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray double nullable prob_pow Probability for a Source with Power-Law from Hardness Ratios stat.probability double nullable fit_pow_nh Absorption Column for Automated Power-Law cm^-2 phys.columnDensity double nullable intr_pow_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux Based on HR-Interpolated Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable fit_apec_flux_a_neg_err Negative Error on Observed 0.3-10 keV Flux for Automated APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable pkrate_hb_neg_err Negative Error on Peak Hard Band (2-10 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray.hard double nullable intr_pow_nh Absorption Column Based on HR-Interpolated Power-Law cm^-2 phys.columnDensity double nullable fix_pow_flux_a_neg_err Negative Error Observed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable pkrate_mb_pos_err Positive Error on Peak Medium Band (1-2 keV) Count Rate ct/s stat.error;stat.max;phot.count;em.X-ray double nullable intr_apec_flux_b_neg_err Negative Error on Unabsorbed 0.3-10 keV Flux for HR-Interpolated APEC erg/cm^2/s stat.error;stat.min;phot.flux;em.X-ray double nullable count_rate_hb_neg_err Negative Error on Hard Band (2-10 keV) Count Rate ct/s stat.error;stat.min;phot.count;em.X-ray.hard double nullable alias_flag Potential Source Alias Flag meta.code short nullable cat_sdssqso_flag Object Appears in SDSS QSO DR14 Catalog meta.code.member short nullable fix_pow_flux_b_pos_err Positive Error Unabsorbed 0.3-10 keV Flux for Power-Law erg/cm^2/s stat.error;stat.max;phot.flux;em.X-ray 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