J/A+A/482/247ivo://CDS.VizieR/J/A+A/482/247doi:10.26093/cds/vizier.34820247CDSParedes J.M.Marti J.Ishwara-Chandra C.H.Torres D.F.Romero G.E.,Combi J.A.Bosch-Ramon V.Munoz-Arjonilla A.J.Sanchez-Sutil J.R.2008-05-25T22:39:01Z2008-05-25T22:36:08ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyradio-sourcesgalaxy-classification-systemsA considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars. However, some low galactic-latitude EGRET sources, with highly variable gamma-ray emission, lack any evident counterpart according to the radio data available until now. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable gamma-ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months.2008A&A...482..247Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/482/247CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/482/247https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/482/247http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/482/247https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/482/247https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/482/247http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/482/247GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/482/247/table4 (List of GMRT sources detected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/482/247/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/482/247/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/482/247/table4?GETtext/xml+votable180.050000true263.40075-15.124277780.0055555555555555565/7384 6/29310-29311 29396-29397 29544 29586-29587 29592-29593 29833 29835-29836 29838https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/482/247?format=asciiGamma-rayOpticalRadiodefaultJ/A+A/482/247/table4List of GMRT sources detectedceSintCombined error in integrated flux densitymJystat.errorfloatVar? Variability index (2)src.var.indexfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGMRT source namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.maine_RAJ2000Error in right ascensionsstat.error;pos.eq.rafloatDEJ2000Declination (J2000)pos.eq.dec;meta.maine_DEJ2000Error in declinationarcsecstat.error;pos.eq.decfloatSpeakPeak flux density at 21cm (in mJy/beam)mJyphot.flux.density;em.radio.750-1500MHzfloate_SpeakError in peak flux density (in mJy/beam)mJystat.errorfloatSintIntegrated flux density at 21cmmJyphot.flux.density;em.radio.750-1500MHzfloate_SintError in integrated flux densitymJystat.errorfloataApparent angular size (major axis)arcsecphys.angSizefloatbApparent angular size (minor axis)arcsecphys.angSize;srcfloatPAPosition angle of major axisdegpos.posAngfloatThetaAngular distance to phase centrearcminpos.angDistancefloatceSpeakCombined error in peak flux density (in mJy/beam)mJystat.errorfloatFlagFlag (1)meta.code.errorchar