J/ApJS/96/303ivo://CDS.VizieR/J/ApJS/96/303doi:10.26093/cds/vizier.20960303CDSWeaver K.A.Arnaud K.A.Boldt E.A.Christian D.Corcoran M.,Holt S.S.Jahoda K.Kelley R.Marshall F.E.Mushotzky R.F.,Petre R.Rawley G.Serlemitsos P.J.Schlegel E.M.Smale A.P.,Swank J.H.Szymkowiak A.E.2013-02-27T06:18:17Z1997-12-09T21:26:35ZCDS support team

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

cds-question@unistra.frx-ray-sourcesThis paper describes the calibration of the two solid-state Si(Li) X-ray detectors and the X-ray telescopes that flew as part of Goddard Space Flight Center's Broad Band X-Ray Telescope (BBXRT) experiment on board the space shuttle Columbia in 1990 December. During the 9 day shuttle mission, BBXRT performed ~150 observations of 82 celestial sources. The content of the archive is summarised here. Although BBXRT had a relatively short life, it stands as a milestone in X-ray astronomy as being the first instrument to offer moderate spectral resolution over a wide bandpass (0.3-12.0keV). Among other things, this paper discusses the effective area calibration of the instrument, the flux calibration and flux corrections for off-axis observations, the detector background, and optimal background subtraction techniques. The on-axis effective area calibration for the central detector elements was performed using data from the Crab Nebula, while other carefully selected targets were used for calibration of the outer detector elements. The remaining systematic uncertainties in the effective area calibration for point sources observed both on and off axis are generally less than 5%-10%. The energy scale is known to better than 0.5% at 6.0 keV for both detectors. The results presented here have an impact on the calibration of other medium resolution X-ray experiments such as the CCDs on board ASCA (Astro-D) as well as the Advanced X-Ray Astrophysics Facility detectors.1995ApJS...96..303Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/96/303CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/96/303https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/96/303http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/96/303https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/96/303https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/96/303http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/96/303GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/96/303/table1 (Broad Band X-Ray Telescope (BBXRT) observation Log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/96/303/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/96/303/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/96/303/table1?GETtext/xml+votable180.050000true14.1713660.71530.0055555555555555566/1196 1504 1701 1704 2012 2432 3030 3063 3729 3886 4439 4695 5163 6036 6122 6241 6340 6508 7606 7610 7768 7869 7980 10379 10474 10605 10912 10927 11290 11596 11668 11723 11898 12121 12405 13743 13875 13947 14285 14305 14632 14692 15112 15243 15351 16655 17754 19883 20286 20624 20764 21450 22159 22577 22580 22854 22902 23652 23995 24185 26292 27719 27765 28517 33049 33094 33097 33235 33958 34535 36417 37475 37925 38016 39235 39247 39267 39327 39937 40432 40809 47014https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/96/303?format=asciiX-raydefaultJ/ApJS/96/303/table1Broad Band X-Ray Telescope (BBXRT) observation LogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharRA1950Nominal right ascension (1950.0)degpos.eq.ra;meta.mainDE1950Nominal declination (1950.0)degpos.eq.dec;meta.mainDRA? Offset in right ascension (1)degpos.eq.ra;arith.difffloatnullableDDE? Offset in declination (1)degpos.eq.dec;arith.difffloatnullableRollRoll angle of the A-system telescope (phi) (2)deginstr.paramfloatStartStart time of MET measured from 1990 December 2, 06:49:01 UTdtime.epochfloatExpTimeExposure timestime.duration;obs.exposurefloatD/N[MND B] Indicator of shuttle day or night (3)instr.setupcharGRMean detector guard rate (4)instr.paramfloatAngleAverage off-axis angle (5)arcmininstr.offset;stat.meanfloatRateTotal count rate in all 10 pixels.ct/sphot.count;em.X-rayfloatClassType of object.src.classchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed