J/ApJ/615/897ivo://CDS.VizieR/J/ApJ/615/897doi:10.26093/cds/vizier.16150897CDSBecker W.Weisskopf M.C.Arzoumanian Z.Lorimer D.Camilo F.,Elsner R.F.Kanbach G.Reimer O.Swartz D.A.Tennant A.F.O'Dell S.L.2017-09-27T05:55:57Z2005-08-22T22:55:15ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frx-ray-sourcesgamma-ray-astronomyradio-sourcesinfrared-sourcesIn search of the counterpart to the brightest unidentified gamma-ray source, 3EG J2020+4017 (2CG 078+2), we report on new X-ray and radio observations of the {gamma} Cygni field with the Chandra X-Ray Observatory and with the Green Bank Telescope (GBT). We also report on reanalysis of archival ROSAT data.2004ApJ...615..897Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/615/897CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)IX/32 : ROSAT Bright Survey (Fischer+, 1998-2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/615/897https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/615/897http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/615/897https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/615/897https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/615/897http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/615/897GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/615/897/table1 (Chandra X-Ray sources in the {gamma} Cygni field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/615/897/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/615/897/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/615/897/table1?GETtext/xml+votable180.050000true304.8675840.43627890.005555555555555556Cone search capability for table J/ApJ/615/897/table2 (Candidate counterparts to the X-ray sources in the {gamma} Cygni field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/615/897/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/615/897/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/615/897/table2?GETtext/xml+votable180.050000true304.8678030640.4362750.0055555555555555566/14653 14696https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/615/897?format=asciiGamma-rayX-rayInfraredRadiodefaultJ/ApJ/615/897/table1Chandra X-Ray sources in the {gamma} Cygni fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BWA2004]NamecharprimaryRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainr1Extraction radiusarcsecfloatNApproximate vignetting-corrected number of source countsctintS/NDetection signal-to-noise ratiofloatr2X-ray position uncertainty (1{sigma} radius) (1)arcsecfloatSep1? Radial separation between X-ray position and USNO position of counterpartarcsecfloatnullableSep2? Radial separation between X-ray position and 2MASS position of counterpartarcsecfloatnullableSep3? Radial separation between X-ray position and ROSAT position of counterpartarcsecfloatnullablef_Sep3Flag on Sep3 (2)charCandSimbad column added by the CDScharOptDisplay the nearby sources from 2MASS, GSC2, and USNO cataloguescharJ/ApJ/615/897/table2Candidate counterparts to the X-ray sources in the {gamma} Cygni fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BWA2004]NamecharRAJ2000? USNO Right Ascension (J2000)degpos.eq.ra;meta.mainnullableDEJ2000? USNO Declination (J2000)degpos.eq.dec;meta.mainnullableN(USNO)? Average number of accidental coincidences expected in the region searched (1)ctfloatnullableRA2deg? 2MASS Right Ascension (J2000)degnullableDE2deg? 2MASS Declination (J2000)degnullableN(2MASS)? Average number of accidental coincidences expected in the region searched (1)ctfloatnullabledelta? Angular separation between the USNO and 2MASS candidate counterpartarcsecfloatnullable