J/ApJ/873/60ivo://CDS.VizieR/J/ApJ/873/60doi:10.26093/cds/vizier.18730060CDSBerlato F.Greiner J.Burgess J.M.2025-05-22T20:11:33Z2023-10-26T14:49:30ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsastrometryThe localizations of gamma-ray bursts (GRBs) detected with the Gamma-ray Burst Monitor (GBM) on board the Fermi satellite are known to be affected by significant systematic errors of 3{deg}-15{deg}. This is primarily due to the mismatch of the employed Band function templates and the actual GRB spectrum. This problem can be avoided by simultaneously fitting for the location and the spectrum of a GRB, as demonstrated with an advanced localization code, BALROG. Here, we analyze in a systematic way a sample of 105 bright GBM-detected GRBs for which accurate reference localizations are available from the Swift observatory. We show that the remaining systematic error can be reduced to ~1{deg}-2{deg}.2019ApJ...873...60Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/873/60CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)J/ApJS/199/18 : The Fermi GBM catalog (Paciesas+, 2012)J/ApJS/207/39 : IPN supplement to the Fermi GBM (Hurley+, 2013)J/ApJS/211/13 : The second Fermi/GBM GRB catalog (4yr) (von Kienlin+, 2014)J/ApJS/216/32 : Localizations of GRBs with Fermi GBM (Connaughton+, 2015)J/ApJ/806/52 : 8 Fermi GRB afterglows follow-up (Singer+, 2015)J/A+A/588/A135 : Fermi/GBM GRB time-resolved spectral catalog (Yu+, 2016)J/ApJS/229/31 : IPN supplement to the 2nd Fermi GBM catalog (Hurley+, 2017)J/ApJ/893/46 : The fourth Fermi-GBM GRB cat.: 10 years (von Kienlin+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/873/60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/873/60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/873/60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/873/60https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/873/60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/873/60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/873/60/table2 (*List of the GRBs analyzed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/873/60/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/873/60/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/873/60/table2?GETtext/xml+votable180.050000true193.6-57.90.0055555555555555566/2 454 646 3114 3242 3322 3553 3718 4450 6068 6401 6983 7603 9431 9495 9781 10205 10428 11003 11130 11135 11647 13775 14072 15399 15656 15878 16257 16306 16367 16379 16662 17180 18435 19580 19720 20713 21273 21429 21595 22855 23107 23510 23572 24072 24496 25200 26367 26916 27822 27960 27965-27966 28392 28577 28728 28929 29214 29523 29710 29729 30605 30794 31531 32182 32651 33293 33629 34492 35533 35636 36355 36462 37379 37413 37554 37620 37909 38046 38915 39564 39712 40184 40687 40868 41298 42441 42783 43060 43254 44124 44610 44701 45313 45404 45473 45493 45865 46593 46995 46998 47244 48221 48393 48447https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/873/60?format=asciiGamma-raydefaultJ/ApJ/873/60/table2*List of the GRBs analyzedTrigTrigger number (YYMMDDddd; <Fermi bnYYMMDDddd> in Simbad) (1)meta.id;meta.mainlongSimbadSimbad column added by the CDSmeta.ref.urlcharf_Trig[*] * : short GRBmeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRASdegSwift right ascension (J2000)degpos.eq.raDESdegSwift declination (J2000)degpos.eq.decRAJ2000BALROG right ascension (J2000)degpos.eq.ra;meta.maine_RAJ2000[0.2/53] RAdeg uncertaintydegstat.error;pos.eq.rafloatDEJ2000BALROG declination (J2000)degpos.eq.dec;meta.maine_DEJ2000[0.2/8] DEdeg uncertaintydegstat.error;pos.eq.decfloatOffset[0.1/7.4] BALROG offsetdegobs.param;arith.difffloatRADdeg? DoL right ascension (J2000)degpos.eq.ranullableDEDdeg? DoL declination (J2000)degpos.eq.decnullablee_posDoL[1/9.6]? DoL position uncertaintydegstat.errorfloatnullableOffDoL[0.4/19.2]? DoL offsetobs.param;arith.difffloatnullableFluence[3.2e-07/0.0025] Fluence in erg/cm^2^0.001J.m**-2phot.fluence;em.gamma.harddoubleFlux[2.7/1100] Peak fluxph.cm**-2.s**-1phot.flux;stat.maxdoubleC15Display data from Connaughton+ 2015, J/ApJS/216/32meta.ref.urlintnullableModelModel (2)meta.notechar