J/ApJ/810/L20ivo://CDS.VizieR/J/ApJ/810/L20doi:10.26093/cds/vizier.18109020CDSMinniti D.Contreras Ramos R.Alonso-Garcia J.Anguita T.Catelan M.,Gran F.Motta V.Muro G.Rojas K.Saito R.K.2017-06-26T11:50:29Z2016-01-19T12:29:23ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgravitational-lensinginfrared-photometryWe report the discovery of a large timescale candidate microlensing event of a bulge stellar source based on near-infrared observations with the VISTA Variables in the Via Lactea Survey (VVV). The new microlensing event is projected only 3.5 arcmin away from the center of the globular cluster NGC 6553. The source appears to be a bulge giant star with magnitude K_s_=13.52, based on the position in the color-magnitude diagram. The foreground lens may be located in the globular cluster, which has well-known parameters such as distance and proper motions. If the lens is a cluster member, we can directly estimate its mass simply following Paczynski which is a modified version of the more general case due to Refsdal. In that case, the lens would be a massive stellar remnant, with M=1.5-3.5M_{sun}_. If the blending fraction of the microlensing event appears to be small, and this lens would represent a good isolated black hole (BH) candidate, that would be the oldest BH known. Alternative explanations (with a larger blending fraction) also point to a massive stellar remnant if the lens is located in the Galactic disk and does not belong to the globular cluster.2015ApJ...810L..20Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/810/L20CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/149/99 : VVV globulars. I. 2MASS-GC 02, Terzan 10 (Alonso-Garcia+, 2015)J/AJ/143/70 : Differential reddening in MW globulars (Alonso-Garcia+, 2012)J/ApJ/625/796 : X-ray sources in the globular cluster 47 Tuc (Heinke+, 2005)http://ogle.astrouw.edu.pl/ogle4/ews/2012/ews.html : OGLE-IV EWS 2012https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/810/L20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/810/L20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/810/L20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/810/L20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/810/L20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/810/L20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap7.952274030004205e-20 1.0188844282367877e-19InfrareddefaultJ/ApJ/810/L20/table1VISTA Variables in the Via Lactea (VVV) Survey near-IR photometry of the candidate microlensing eventrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[55298.3/56955.1] Ks-band observation epoch (MJD)dtime.epoch;obsdoubleKsmag[12.82/13.68] Ks-band observationsmagphot.mag;em.IR.Kfloate_Ksmag[0.007/0.08] uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloat