J/MNRAS/471/3028ivo://CDS.VizieR/J/MNRAS/471/3028doi:10.26093/cds/vizier.74713028CDSRahna P.T.Murthy J.Safonova M.Sutaria F.Gudennavar S.B.,Bubbly S.G.2024-08-17T20:20:25Z2020-07-22T12:51:03ZCDS support team

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

cds-question@unistra.frstandard-starsultraviolet-photometryWe have studied the performance of the Ultraviolet Imaging Telescope payload on AstroSat and derived a calibration of the far-ultraviolet (FUV) and near-ultraviolet (NUV) instruments on board. We find that the sensitivity of both the FUV and NUV channels is as expected from ground calibrations, with the FUV effective area about 35 per cent and the NUV effective area about the same as that of GALEX. The point spread function of the instrument is on the order of 1.2-1.6''. We have found that pixel-to-pixel variations in the sensitivity are less than 10 per cent with spacecraft motion compensating for most of the flat-field variations. We derived a distortion correction but recommend that it be applied post-processing as part of an astrometric solution.2017MNRAS.471.3028Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/471/3028CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/471/3028https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/471/3028http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/471/3028https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/471/3028https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/471/3028http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/471/3028GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/471/3028/table3 (Photometry of stars used in the calibration)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3028/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3028/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3028/table3?GETtext/xml+votable180.050000true11.965285.31880.0055555555555555566/326 2934 2940 3875 4075-4076 4078 7799 7805 7970 12121 12123 15969 15971 16645 16647 17138 17144 17232 17234-17235 17237 17239 22476 22478 23465 23468 24185 33330 34242-34243 34531 34881 44894 45220 45222 47100-47102https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/471/3028?format=asciiUVdefaultJ/MNRAS/471/3028/table3Photometry of stars used in the calibrationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[1/2694] Star identification number, within the detector (FUV or NUV)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGALEXCRGALEX count ratect/sphot.count;em.UVfloatTexpGGALEX exposure timestime.duration;obs.exposuredoubleUVITCRUVIT count ratect/sphot.count;em.UVdoubleTexpUUVIT exposure timestime.duration;obs.exposuredoubleFiltFilter (F1, F2, F3, F5 or F6)meta.id;instr.filtercharDetDetector (FUV or NUV)meta.idchar