J/AJ/170/338ivo://CDS.VizieR/J/AJ/170/338CDSSumi T.Buckley D.A.H.Kutyrev A.S.Tamura M.Bennett D.P.Bond I.A.,Cataldo G.Durbak J.M.Cenko S.B.Fixsen D.Guiffreda O.Hamada R.,Hirao Y.Idei A.Kelly D.Loose M.Lotkin G.N.Lyness E.I.Maher S.,Makida S.Matsunaga N.Miyazaki S.Mosby G.Moseley S.H.Nagai T.,Nagano T.Nakayama S.Nishio M.Nunota K.Ogawa R.Oishi R.,Okumoto Y.Rattenbury N.J.Satoh Y.K.Sharp E.H.Suzuki D.,Tamaoki T.Troja E.White S.V.Yama H.PRIME collaboration2026-09-03T07:56:07Z2026-09-03T08:55:58ZCDS support team

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

cds-question@unistra.frgravitational-lensingexoplanetsinfrared-photometryWe present the description of the instruments and the first results of the PRime-focus Infrared Microlensing Experiment (PRIME). PRIME is the first dedicated near-infrared (NIR) microlensing survey telescope, and is located at the South African Astronomical Observatory in Sutherland, South Africa. Among its class, it offers one of the widest fields of view in the NIR regime. PRIME's main goals are (1) to study planetary formation by measuring the frequency and mass function of planets. In particular, we compare results from the central Galactic bulge (GB), accessible only in the NIR by PRIME, with those from the outer GB by optical surveys. (2) To conduct concurrent observations with NASA's Nancy Grace Roman Space Telescope. Due to the different lines of sight between the ground and space, we detect slight variations in light curves, known as "space-based parallax." This effect allows us to measure the mass of lens systems and their distance from the Earth. It is the only method to measure the mass of free-floating planets down to Earth mass. We began the GB survey in 2024 February and analyzed images through 2025 June 1, identifying 486 microlensing candidates and over a thousand variable stars, including Mira variables, which are useful for studying the Galactic structure. We issue real-time alerts for follow-up observations, supporting exoplanet searches and the chemical evolution studies in the GB. During the off-bulge season, we conduct an all-sky grid survey and target-of-opportunity observations of transients, including gravitational-wave events, {gamma}-ray bursts, and other science.2025AJ....170..338Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/338CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)J/AcA/51/175 : OGLE-II DIA microlensing events (Wozniak+, 2001)J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)J/A+A/454/185 : EROS-2 microlensing parameters (Hamadache+, 2006)J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)J/MNRAS/399/1709 : Near-infrared survey of Miras (Matsunaga+, 2009)J/ApJ/778/150 : Microlensing events toward the Bulge from MOA-II (Sumi+, 2013)J/ApJS/216/12 : OGLE-III Galactic bulge microlens. events (Wyrzykowski+, 2015)J/A+A/591/A145 : VVV Survey outer bulge RRab stars (Gran+, 2016)J/MNRAS/458/3012 : OGLE-III Parallax microlensing events (Wyrzykowski+, 2016)J/ApJ/827/139 : Microlens. opt. depth & event rates from MOA-II (Sumi+, 2016)J/AcA/67/297 : OGLE Galactic center Cepheids and RR Lyrae (Soszynski+, 2017)J/AcA/68/183 : Predicted Microlens. Events for the 21st Cent. (Bramich+, 2018)J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)J/ApJS/249/16 : Microlensing event in the OGLE-IV GVS survey (Mroz+, 2020)J/A+A/633/A98 : Gaia16aye microlensing event photometry (Wyrzykowski+, 2020)J/ApJ/893/65 : VVV Survey microlensing events in Gal. Bulge (Navarro+, 2020)J/ApJ/889/56 : VVV surv. microlens. events; -3.7<b<3.9{deg} (Navarro+, 2020)J/A+A/655/A117 : Carbon & oxygen in microlensed bulge dwarfs (Bensby+, 2021)J/MNRAS/506/2482 : Microlensing events in VVV light curves (Husseiniova+, 2021)J/ApJS/260/46 : Milky Way Mira variable stars from OGLE (Iwanek+, 2022)J/MNRAS/517/257 : 1782 Mira variab. candidates with VVV survey (Sanders+, 2022)J/AJ/163/176 : Prediction of microlensing events with Gaia EDR3 (Kluter+, 2022)J/AJ/166/107 : 6111 micro-lensing events with MOA (Koshimoto+, 2023)J/AJ/165/103 : Systematic KMTNet Planetary Anomaly Search. VII. (Zang+, 2023)J/A+A/674/A23 : Gaia DR3 Microlensing events (Wyrzykowski+, 2023)J/A+A/693/A28 : Unveiling VVV/WISE Mira variables (Albarracin+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/338https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/338http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/338https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/338https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/338http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/338GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/170/338/table6 (Microlensing candidates from the 2024 season)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/338/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/338/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/338/table6?GETtext/xml+votable180.050000true269.658733333-27.5599911110.0055555555555555564/1801 5/7201 7203 7209 7212-7213 7216 7218 7224 6/28718-28719 28730-28731 28734 28809 28811 28833-28835 28857 28860-28861 28868-28870 28876 28878 28900 28904-28905https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/170/338?format=asciiInfrareddefaultJ/AJ/170/338/table6Microlensing candidates from the 2024 seasonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDEvent identifiermeta.id;meta.maincharRAJ2000[17/18] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[24/33] Degree of Declination (J2000)pos.eq.dec;meta.mainGLON[-4.3/3.95] Galactic longitudedegpos.galactic.lonGLAT[-3.35/2.61] Galactic latitudedegpos.galactic.latdoubleHJD[10329/10931] Heliocentric Julian Date of maximum; HJD-2450000dtime.epochdoubletE[0.33/82219] Einstein radius crossing timedtime.scaledoublemu0[0/60.76] Impact parametersrc.impactParamfloatHmag[0.26/99.99] Baseline H-band magnitudemagphot.mag;em.IR.Hfloat