J/MNRAS/492/3904ivo://CDS.VizieR/J/MNRAS/492/3904doi:10.26093/cds/vizier/bg-fc-3t0CDSAntier S.Agayeva S.Aivazyan V.Alishov S.Arbouch E.Baransky A.,Barynova K.Bai J.M.Basa S.Beradze S.Bertin E.Berthier J.,Blazek M.Boer M.Burkhonov O.Burrell A.Cailleau A.Chabert B.,Chen J.C.Christensen N.Coleiro A.Cordier B.Corre D.Coughlin M.W.,Coward D.Crisp H.Delattre C.Dietrich T.Ducoin J.-G.Duverne P.-A.,Marchal-Duval G.Gendre B.Eymar L.Fock-Hang P.Han X.Hello P.,Howell E.J.Inasaridze R.Ismailov N.Kann D.A.Kapanadze G.Klotz A.,Kochiashvili N.Lachaud C.Leroy N.Le Van Su A.Lin W.L.Li W.X.,Lognone P.Marron R.Mo J.Moore J.Natsvlishvili R.Noysena K.,Perrigault S.Peyrot A.Samadov D.Sadibekova T.Simon A.Stachie C.,Teng J.P.Thierry P.Thone C.C.Tillayev Y.Turpin D.,de Ugarte Postigo A.Vachier F.Vardosanidze M.Vasylenko V.Vidadi Z.,Wang X.F.Wang C.J.Wei J.Yan S.Y.Zhang J.C.Zhang J.J.Zhang X.H.2026-08-03T07:29:40Z2023-06-14T15:21:46ZCDS support team

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

cds-question@unistra.frgravitational-wavestransient-sourcesblack-holesneutron-starsphotometryspectroscopyvisible-astronomyinfrared-astronomyWe present the Global Rapid Advanced Network Devoted to the Multi-messenger Addicts (GRANDMA). The network consists of 21 telescopes with both photometric and spectroscopic facilities. They are connected together thanks to a dedicated infrastructure. The network aims at coordinating the observations of large sky position estimates of transient events to enhance their follow-up and reduce the delay between the initial detection and optical confirmation. The GRANDMA programme mainly focuses on follow-up of gravitational-wave alerts to find and characterize the electromagnetic counterpart during the third observational campaign of the Advanced LIGO and Advanced Virgo detectors. But it allows for follow-up of any transient alerts involving neutrinos or gamma-ray bursts, even those with poor spatial localization. We present the different facilities, tools, and methods we developed for this network and show its efficiency using observations of LIGO/Virgo S190425z, a binary neutron star merger candidate. We furthermore report on all GRANDMA follow-up observations performed during the first six months of the LIGO-Virgo observational campaign, and we derive constraints on the kilonova properties assuming that the events' locations were imaged by our telescopes.2020MNRAS.492.3904Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/492/3904CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/492/3904https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/492/3904http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/492/3904https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/492/3904https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/492/3904http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/492/3904GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/492/3904/tableb1 (List of tiled observations performed by the TAROT network for 190425z)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3904/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3904/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3904/tableb1?GETtext/xml+votable180.050000true194.59530.00.005555555555555556Cone search capability for table J/MNRAS/492/3904/tableb2 (List of galaxies, enclosed in the 3D probability region of S190425z)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/3904/tableb2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/3904/tableb2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/3904/tableb2?GETtext/xml+votable180.050000true182.08125.2330.0055555555555555566/8563 8573-8575 8660-8661 8670 8699 8702 9224 9258-9259 10406 28438 28441 28446 28502 29366 29372 29375 30838 31109 31111https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/492/3904?format=asciiOpticalInfrareddefaultJ/MNRAS/492/3904/table1List of telescopes of the GRANDMA consortium and their photometric performance when using their standard setuprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescopemeta.id;instr.telcharLocLocation of the telescopepos.earth.altitude;instr.obstycharAperAperture of the telescopeminstr.fovfloatFoVField of viewdeginstr.fovcharFiltersFilters usedmeta.code;instr.filtercharMag3s3-{sigma} limit in AB magnitudemagphot.magfloatExpTimeExposure time corresponding to the 3-{sigma} limit in AB magnitudestime.duration;obs.exposureintFilterFiter corresponding to the 3-{sigma} limit in AB magnitudemeta.code;instr.filtercharNightslotMaximum night slot (UTC)htime.epochcharJ/MNRAS/492/3904/table2List of telescopes of the GRANDMA consortium with spectroscopic capabilitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTel/InstTelescope/Instrumentmeta.notecharLocLocation of the telescopepos.earth.altitude;instr.obstycharwvlrangeWavelength range of the instrumentinstr.bandwidth;em.wlcharSpResSpectral resolution {lambda}/{Delta}{lambda}spect.resolutionintlimmagLimiting magnitude in 1hphot.magintJ/MNRAS/492/3904/table3Summary of the GRANDMA observations during the first six months for BBH candidatesTimeUTC timetime.epochnullableL_TypeProbability of the reported alert type%statintDistDistanceMpcpos.distanceinte_DistError on DistMpcstat.errorintTelTelescope (1)meta.id;instr.telchardt? Delay with respect to the gravitational wave trigger {delta}them.wl;arith.difffloatnullableDt? Duration of the observations {Delta}Thtime.duration;obsfloatnullablelimmagLimiting magnitudemagphot.magcharProb? Coverage of GRANDMA compared to the latest revision of the sky localization area in percentage%stat.fit.paramfloatnullableArea? Coverage of GRANDMAdeg**2phys.angSizeintnullableAlertAlert designationmeta.id;meta.maincharf_Alert[a] Flag on Alert (G1)meta.codecharType[MG /BBH] Type of the alert (Mass-gap event or binary black hole)src.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint0.9cr90 per cent credible region of the latest sky localization area sent by LIGO-Virgodeg**2phys.angSizeintJ/MNRAS/492/3904/table4Summary of the GRANDMA observations during the first six months for binary neutron star or neutron star-black hole merger candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAlertAlert designationmeta.id;meta.maincharf_Alert[a] Flag on Alert (G1)meta.codecharTimeUTC timetime.epochnullableType[NSBH/BNS ] Type of the alert (neutron star black hole merger or binary neutron star)src.classcharL_TypeProbability of the reported alert type%statintDistDistanceMpcpos.distanceinte_DistError on DistMpcstat.errorint0.9cr90 per cent credible region of the latest sky localization area sent by LIGO-Virgodeg**2phys.angSizeintTelTelescopemeta.id;instr.telchardtDelay with respect to the gravitational wave trigger {delta}them.wl;arith.difffloatDtDuration of the observations {Delta}Thtime.duration;obsfloatlimmagLimiting magnitudemagphot.magcharl_ProbLimit flag on Probmeta.code.errorcharProbCoverage of GRANDMA compared to the latest revision of the sky localization area in percentage%stat.fit.paramfloatl_AreaLimit flag on Areameta.code.error;phys.areacharAreaCoverage of GRANDMAdeg**2phys.angSizeintJ/MNRAS/492/3904/tablea1Sky coverage observations of the GRANDMA consortium during the first six monthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAlertAlert designationmeta.id;meta.maincharSkyLocGRANDMA sky localization coverage Linkmeta.ref.urlcharGCNGCN reportmeta.bibcharJ/MNRAS/492/3904/tableb1List of tiled observations performed by the TAROT network for 190425zrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope used (TAROT-TRE, TAROT-TCA or TAROT-TCH)instr.setupcharDatestDate of the start of the observationtime.epochnullableTimestTime of the start of the observationtime.epochnullableDateendDate of the end of the observationtime.epochnullableTimeendTime of the end of the observationtime.epochnullableRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainCov2D spatial probability of the LALInference GW skymap enclosed in a given tile%statfloatJ/MNRAS/492/3904/tableb2List of galaxies, enclosed in the 3D probability region of S190425zSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope usedinstr.setupcharDatestDate of the start of the observationtime.epochTimestTime at the start of the observationtime.epochnullableDateendDate of the end of the observationtime.epochTimeendTime of the end of the observationtime.epochnullableNameGalaxy namemeta.id;meta.maincharONameAlternative galaxy namemeta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainDistDistanceMpcpos.distancefloat