J/ApJ/872/118ivo://CDS.VizieR/J/ApJ/872/118doi:10.26093/cds/vizier.18720118CDSBecerra R.L.Watson A.M.Fraija N.Butler N.R.Lee W.H.Troja E.,Roman-Zuniga C.G.Kutyrev A.S.Alvarez Nunez L.C.Angeles F.Chapa O.,Cuevas S.Farah A.S.Fuentes-Fernandez J.Figueroa L.Langarica R.,Quiros F.Ruiz-Diaz-Soto J.Tejada C.G.Tinoco S.J.2020-11-26T11:32:20Z2020-08-27T07:46:56ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsphotometryvisible-astronomyWe present optical photometry of the afterglow of the long GRB 180205A with the COATLI telescope from 217s to about 5d after the Swift/BAT trigger. We analyze this photometry in conjunction with the X-ray light curve from Swift/XRT. The late-time light curves and spectra are consistent with the standard forward-shock scenario. However, the early-time optical and X-ray light curves show atypical behavior; the optical light curve exhibits a flat plateau while the X-ray light curve shows a flare. We explore several scenarios and conclude that the most likely explanation for the early behavior is late activity of the central engine.2019ApJ...872..118Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/872/118CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/eso : ESO Science Archive Catalog (ESO, 1991-2020)J/AJ/133/1027 : Positions for 179 Swift X-ray afterglows (Butler+, 2007)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/701/824 : Afterglows of GRBs (Nysewander+, 2009)J/PASP/124/140 : UBVRI Hp BT and VT photonic responses (Bessell+, 2012)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/A+A/562/A29 : GRB 100814A GROND and UVOT light curves (Nardini+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/872/118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/872/118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/872/118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/872/118https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/872/118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/872/118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticaldefaultJ/ApJ/872/118/table3COATLI observations of GRB 180205Ati[217/424009] Exposure start time (1)stime.start;obs.exposuredoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinttf[217.8/463199.5] Exposure end time (1)stime.end;obs.exposuredoubletexp[0.8/29230] Total exposure timestime.duration;obs.exposurefloatwmag[15.5/21.5] COATLI AB magnitude w, not corrected for Galactic extinctionmagphot.mag;em.optfloate_wmag[0.017/0.2] 1{sigma} total uncertainty in wmag (2)magstat.error;phot.magfloat