VERIMASTER ivo://nasa.heasarc/verimaster NASA/GSFC HEASARC The VERITAS Collaboration 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is a major ground-based gamma-ray observatory operating at the Fred Lawrence Whipple Observatory (FLWO) in southern Arizona, USA. It is an array of four 12m optical telescopes for gamma-ray astronomy in the GeV - TeV energy range. VERITAS is an imaging air Cerenkov system. Gamma-rays from astrophysical sources create particle showers in the Earth's upper atmosphere that produce Cerenkov photons detected on the ground using the large optical telescopes. These telescopes are deployed such that they have the highest sensitivity in the VHE energy band (50 GeV - 50 TeV), with maximum sensitivity from 100 GeV to 10 TeV. The four telescope array is needed for stereoscopic observations that allow the reconstruction of the particle shower geometry, thus giving precise angular and energy resolution. This very high energy observatory, completed in 2007, effectively complements the Fermi Gamma-ray Space Telescope due to its large collection area as well as its higher energy bound and improved angular resolution. VERITAS started four-telescope operations in 2007 and collects about 1100 hours of good-weather data per year. The VERITAS collaboration has published over 100 journal articles since 2008 reporting on gamma-ray observations of a large variety of objects: Galactic sources like supernova remnants, pulsar wind nebulae, and binary systems; extragalactic sources like star forming galaxies, dwarf-spheroidal galaxies, and highly-variable active galactic nuclei. Additional details are available at the <a href="https://veritas.sao.arizona.edu/">VERITAS website</a>. The catalog lists the sources observed by VERITAS as of April 2022, including cross-matches with other gamma-ray observations and spectral fits. This catalog has associated high-level data products containing data from VERITAS publications. This database table was ingested by the HEASARC in December 2022 and is based upon data files provided by the VERITAS Team. A minor correction to one entry in the catalog was made in April 2024. <p> High-level data products were collected from VERITAS publications. Data and fit results were extracted from the published papers or from internal VERITAS analysis results used to produce the published figures and tables. In many cases, spectral and light curve data were obtained by digitizing published figures. This process was led by Gernot Maier at DESY with contributions from many members of the VERITAS collaboration. The primary archive can be accessed on <a href="https://github.com/VERITAS-Observatory/VERITAS-VTSCat">GitHub</a> or downloaded via Zenodo (doi:10.5281/zenodo.6163391). Translation to formats suitable for the HEASARC was led by Philip Kaaret with assistance by Sameer Patel at the University of Iowa and by the HEASARC Team. This is a service provided by NASA HEASARC . 2023RNAAS...7....6A https://heasarc.gsfc.nasa.gov/W3Browse/all/verimaster.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=verimaster& GET text/xml 180 99999 true 276.55441 -13.58004 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=verimaster GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_verimaster&Action=More+Options&Action=Parameter+Search&ConeAdd=1 MASTER CATALOG 0.0166666666666667 Gamma-ray public verimaster VERITAS Source Catalog name Catalog Source Designation meta.id;meta.main char nullable simbad_name SIMBAD Source Identification meta.id char nullable component_flag Value Indicates Component of Source (diffuse or pulsed), Where Applicable meta.code;src char nullable location_flag Value Indicates Source Is Galactic (gal) or Extragalactic (egal) meta.code;src char nullable ra Right Ascension of SIMBAD Identification degree pos.eq.ra;meta.main double nullable dec Declination of SIMBAD Identification degree pos.eq.dec;meta.main double nullable ref_id Bibliographic Reference Code for Paper in Which Data for Source Was Published meta.bib.bibcode char nullable pub_ra Right Ascension of Object from Fit to VERITAS Data degree pos.eq.ra double nullable pub_dec Declination of Object from Fit to VERITAS Data degree pos.eq.dec double nullable counts Number of Excess (Background-Subtracted) Counts ct phot;em.gamma.hard double nullable sigma Statistical Significance of the Excess Counts sigma stat.snr double nullable exposure Exposure Time of the Observation s time.duration;obs.exposure double nullable flux Integral Flux ? erg/s/cm^2 phot.flux;em.gamma.hard double nullable spec_model_type Value Specifies the Spectral Model to Fit the VERITAS Spectrum meta.code;stat.fit char nullable src_to_bck_area Normalization Factor Between on and off Regions phot;arith.ratio double nullable spec_energy_cut Cut-Off Energy for the Spectral Model (ecpl and lppl Only) TeV em.energy;stat.fit double nullable entry_number Numerical Identifier for Each Entry of a Source in the Catalog meta.id short nullable spectral_index Spectral Index of the Fit spect.index double nullable pub_ra_sys_err Systematic Error in Right Ascension degree stat.error.sys;pos.eq.ra double nullable spec_pl2_lower_energy Lower Energy Bound for the Integral That Gives the Integrated Flux for pl2 Model TeV em.energy;stat.fit;stat.min double nullable fit_dof Degrees of Freedom for the Fit stat.fit.dof short nullable spec_lppl_index Spectral Index of the lppl Model spect.index double nullable pub_dec_error Error in Declination degree stat.error;pos.eq.dec double nullable spec_lower_energy Lower Bound of Energy Range of Spectral Fit TeV em.energy;stat.fit;stat.min double nullable spec_lppl_beta Pre-Factor Beta of the lppl Model stat.fit double nullable spec_flux Integrated Energy Flux erg/s/cm^2 phot.flux;em.gamma.hard;meta.modelled double nullable bck_counts Number of Counts in the off Region (Background Counts) ct phot;instr.background;em.gamma.hard double nullable spectral_index_sys_err Systematic Error in Spectral Index stat.error;spect.index double nullable source_extent_sys_err Systematic Error in Source Extension arcsec stat.error;phys.angSize double nullable notes Notes Concerning the Source or Data meta.note char nullable photflux Photon Flux photon/s/cm^2 phot.flux double nullable orbital_period Orbital Period of the Source d time.period double nullable spec_max_phase End of Orbital Phase Range for Spectral Fit time.phase double nullable source_extent_2_sys_err Systematic Error in Secondary Source Extension arcsec double nullable unique_id Unique Identifier for Each Entry in the Catalog meta.id char nullable bii Galactic Latitude of SIMBAD Identification degree pos.galactic.lat double nullable spec_end_date End Date/Time of Data Used for Spectral Fit mjd time.end double nullable source_extent Source Extension, Symmetric Gaussian or Asymmetric Gaussian Morphology arcsec phys.angSize double nullable spec_flux_sys_err Systematic Error in Integrated Energy Flux erg/s/cm^2 stat.error;phot.flux;em.gamma.hard;meta.modelled double nullable lii Galactic Longitude of SIMBAD Identification degree pos.galactic.lon double nullable file_id Identifier for Data Products Related to this Source meta.id;meta.file char nullable morph_class Morphological Classification of Source (point or gauss) meta.code;src.morph char nullable extraction_radius Integration Radius for Spectral Measurement arcsec phys.angSize double nullable orbital_period_pos_err Upper Error for Orbital Period d stat.error;time.period double nullable photflux_error Error in Photon Flux photon/s/cm^2 stat.error;phot.flux double nullable spec_lppl_beta_error Error in Pre-Factor Beta of the lppl Model stat.error;stat.fit double nullable orbital_date Reference Date for Orbital Period Calculation (Phase Zero) mjd time.start double nullable spectral_ref_energy Reference Energy of the Spectral Model (pl, pl2, and lppl Only) TeV stat.fit.param;em.energy double nullable other_names Comma-Separated List of Additional Source Designation(s) meta.id char nullable position_angle_flag Value Indicates Frame of Reference for Position Angle Measurement meta.code;pos.posAng char nullable source_extent_2 Secondary Source Extension in Cases of Asymmetric Gaussian Morphology arcsec phys.angSize double nullable source_number Numerical Identifier for Each Unique Source in the Catalog meta.id;src int nullable position_angle_error Error in Position Angle degree stat.error;pos.posAng double nullable spec_upper_energy Upper Bound of Energy Range of Spectral Fit TeV em.energy;stat.fit;stat.max double nullable obsid Unique Observation Identifier meta.id;obs char nullable source_extent_error Error in Source Extension arcsec stat.error;phys.angSize double nullable spec_energy_cut_error Error in Cut-Off Energy TeV stat.error;em.energy;stat.fit double nullable spec_min_phase Start of Orbital Phase Range for Spectral Fit time.phase double nullable pub_dec_sys_err Systematic Error in Declination degree stat.error.sys;pos.eq.dec double nullable lower_energy Energy Threshold Assumed in Integrated Flux Calculation TeV em.energy;stat.min double nullable source_extent_2_error Error in Secondary Source Extension arcsec stat.error;phys.angSize double nullable chi_squared Chi Squared for the Fit stat.fit.chi2 double nullable orbital_period_error Error in Orbital Period d stat.error;time.period double nullable src_counts Number of Counts in the on Region (Source Counts) ct phot.count double nullable position_angle Rotation Angle to Plane for Asymmetric Gaussian Morphology degree pos.posAng double nullable pub_ra_error Error in Right Ascension degree stat.error;pos.eq.ra double nullable photflux_sys_err Systematic Error in Photon Flux photon/s/cm^2 stat.error;phot.flux double nullable sigma_post Stat. Significance of Excess Taking into Account Look-Elsewhere Effect (Trials) sigma stat.snr double nullable spec_lppl_index_error Error in Spectral Index of the lppl Model stat.error;spect.index double nullable spectral_index_error Error in Spectral Index stat.error;spect.index double nullable spec_flux_error Error in Integrated Energy Flux erg/s/cm^2 stat.error;phot.flux;em.gamma.hard;meta.modelled double nullable spec_start_date Start Date/Time of Data Used for Spectral Fit mjd time.start double nullable orbital_period_neg_err Lower Error for Orbital Period d stat.error;time.period double nullable position_angle_sys_err Systematic Error in Position Angle degree stat.error;phys.angSize 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