J/ApJ/860/L21ivo://CDS.VizieR/J/ApJ/860/L21doi:10.26093/cds/vizier.18609021CDSZafar T.Heintz K.E.Fynbo J.P.U.Malesani D.Bolmer J.Ledoux C.,Arabsalmani M.Kaper L.Campana S.Starling R.L.C.Selsing J.,Kann D.A.de Ugarte Postigo A.Schweyer T.Christensen L.Moller P.,Japelj J.Perley D.Tanvir N.R.D'Avanzo P.Hartmann D.H.Hjorth J.,Covino S.Sbarufatti B.Jakobsson P.Izzo L.Salvaterra R.D'Elia V.,Xu D.2019-08-21T10:54:55Z2019-08-05T08:28:40ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsinfrared-photometryvisible-astronomybroad-band-photometryThe ultraviolet (UV) extinction feature at 2175{AA} is ubiquitously observed in the Galaxy but is rarely detected at high redshifts. Here we report the spectroscopic detection of the 2175{AA} bump on the sightline to the {gamma}-ray burst (GRB) afterglow GRB180325A at z=2.2486, the only unambiguous detection over the past 10 years of GRB follow-up, at four different epochs with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT)/X-shooter. Additional photometric observations of the afterglow are obtained with the Gamma-Ray burst Optical and Near-Infrared Detector (GROND). We construct the near-infrared to X-ray spectral energy distributions (SEDs) at four spectroscopic epochs. The SEDs are well described by a single power law and an extinction law with RV~4.4, Av~1.5, and the 2175{AA} extinction feature. The bump strength and extinction curve are shallower than the average Galactic extinction curve. We determine a metallicity of [Zn/H]{>}-0.98 from the VLT/X-shooter spectrum. We detect strong neutral carbon associated with the GRB with equivalent width of Wr({lambda}1656)=0.85+/-0.05. We also detect optical emission lines from the host galaxy. Based on the H{alpha} emission-line flux, the derived dust-corrected star formation rate is ~46+/-4M_{sun}_/yr and the predicted stellar mass is log M*/M_{sun}_~9.3+/-0.4, suggesting that the host galaxy is among the main-sequence star-forming galaxies.2018ApJ...860L..21Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/860/L21CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/732/110 : SDSS 2175{AA} extinction bump candidates (Jiang+, 2011)J/AJ/141/36 : GRB 080607 multi-band light curves (Perley+, 2011)J/A+A/572/A12 : GRB 140506A spectra (Fynbo+, 2014)J/A+A/601/A83 : GRB 140506A X-shooter spectra (Heintz+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/860/L21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/860/L21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/860/L21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/860/L21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/860/L21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/860/L21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticalInfrareddefaultJ/ApJ/860/L21/table1Multi-band photometric observations of GRB 180325ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFacilityFacility (1)meta.id;instr.telcharFiltFilter used (RgrizJHK)instr.setup;instr.filterchart-T0Time since the burst trigger (2018 March 25 at 01:53:02)stime;arith.diffdoubleExp[10/1170] Exposure timestime.duration;obs.exposurefloatomag[16.1/23.6] Observed AB magnitude in Filtermagphot.magfloate_omag[0.02/0.3]? Uncertainty in omagmagstat.error;phot.magdoublenullablel_omag[1]? 3{sigma} upper limit flag on omagmeta.code.errorintnullable