PolCalVisivo://astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilitiesASTRONApertif Team2026-04-10T15:23:43Michael Sipior

Oude Hoogeveensedijk 4, 7991PD Dwingeloo, the Netherlands

vo@astron.nlHI lineradio Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), providing forty instantaneous beams over 300 MHz of bandwidth. A description of the second data release is to be included here. The raw visibility data are provided as separate collections for the survey fields, flux calibrator and polarization calibrator observations. The tables can be joined to identify the associated calibrators for a target observation. This service queries the raw visibilities for the polarization calibrator. These are stored on tape and are not immediately available for download. The data release documentation should be consulted for up-to-date information on how to access the data.2022A&A...667A..38Ahttps://vo.astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilities/infoSurveyResearchserved-byThe VO @ ASTRON TAP serviceLicensed under CC-BYhttps://vo.astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilities/scs.xml?GETapplication/x-votable+xmlRARight Ascension (ICRS decimal)degpos.eq.rarealDECDeclination (ICRS decimal)degpos.eq.decrealSRSearch radiusdegrealtargetName of the fieldmeta.idcharbeamBeam numbermeta.idintegerobsidObservation idmeta.idchar180100000true342.133.90.001https://vo.astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilities/availabilityhttps://vo.astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilities/capabilitieshttps://vo.astron.nl/apertif_dr2/q/apertif_dr2_pol_cal_visibilities/tableMetadatahttps://vo.astron.nl/tapWSRTApertifRadioapertif_dr2apertif_dr2.pol_cal_visibilitiestargetmeta.idcharnullableradegpos.eq.ra;meta.mainfloatindexednullabledecdegpos.eq.dec;meta.mainfloatindexednullablebeammeta.idintfovdegphys.angSize;instr.fovfloatnullablecentral_frequencyMHzem.frequencyfloatnullablen_channelsmeta.numberintbandwidthMHzem.frequencyfloatnullablet_mintime.start;obs.exposurecharnullablet_maxtime.end;obs.exposurecharnullabledurationhtime.duration;obs.exposurefloatnullabletask_idmeta.idcharnullableobsidmeta.idcharnullabledataproduct_typemeta.idcharnullabledataproduct_subtypemeta.idcharnullableproduct_keymeta.idcharnullableequinoxmeta.textcharnullablequalitymeta.idcharnullablepub_didDataset identifier assigned by the publishermeta.id;meta.maincharnullableaccrefAccess url for the dataAccess.Referencecharnullableused_forObservation calibrated with this calibratormeta.idcharnullable