J/A+A/448/L9ivo://CDS.VizieR/J/A+A/448/L9doi:10.26093/cds/vizier.34489009CDSMoretti A.Perri M.Capalbi M.Angelini L.Hill J.E.Campana S.,Burrows D.N.Osborne J.P.Tagliaferri G.Cusumano G.Giommi P.,Romano P.Mineo T.Kennea J.Morris D.Nousek J.Pagani C.,Racusin J.Abbey A.F.Beardmore A.P.Godet O.Goad M.R.Page K.L.,Wells A.A.Chincarini G.2006-06-04T06:46:17Z2006-06-04T06:44:26ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyastrometryWe present a catalogue of refined positions of 68 gamma ray burst (GRB) afterglows observed by the Swift X-ray Telescope (XRT) from the launch up to 2005 Oct. 16. This is a result of the refinement of the XRT boresight calibration. We tested this correction by means of a systematic study of a large sample of X-ray sources observed by XRT with well established optical counterparts. We found that we can reduce the systematic error radius of the measurements by a factor of two, from 6.5 to 3.2 (90% of confidence). We corrected all the positions of the afterglows observed by XRT in the first 11 months of the Swift mission. This is particularly important for the 37 X-ray afterglows without optical counterpart. Optical follow-up of dark GRBs, in fact, will be more efficient with the use of the more accurate XRT positions.2006A&A...448L...9Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/448/L9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)J/A+A/385/377 : 319 gamma-ray bursts BATSE triggers (Quilligan+, 2002)J/A+A/438/1175 : First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue (Rau+, 2005)J/ApJ/616/1072 : The GUSBAD catalog of gamma-ray bursts (Schmidt+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/448/L9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/448/L9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/448/L9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/448/L9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/448/L9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/448/L9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/448/L9/table1 (Refined positions and 90% statistical and systematic position error radii for the whole sample of 68 GRB afterglows observed by the Swift XRT.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/448/L9/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/448/L9/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/448/L9/table1?GETtext/xml+votable180.050000true100.197625-37.07366670.0055555555555555566/338 3405 3849 3927 4323 4485 4955 5455 5726 9100 9682 10278 10411 10666 10836 13312 13558 15004 15473 15513 15595 16172 16232 16546 17279 17453 18910 19731 19911 20263 20655 21498 22422 25293 25597 25901 27841 27911 28063 28497 29867 30553 30568 31494 31667 32239 33323 33845 34435 34440 35088 36074 37071 37830 38301 39630 40642 41555 41755 42865 42952 43280 43920 44021 44160 47136 47459 49004https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/448/L9?format=asciiGamma-raydefaultJ/A+A/448/L9/table1Refined positions and 90% statistical and systematic position error radii for the whole sample of 68 GRB afterglows observed by the Swift XRT.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB designationmeta.id;meta.maincharRAJ2000Rigth ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainePos90% statistical and systematic position error radiusarcsecstat.errorfloat