J/ApJ/848/L33ivo://CDS.VizieR/J/ApJ/848/L33doi:10.26093/cds/vizier.18489033CDSArcavi I.McCully C.Hosseinzadeh G.Howell D.A.Vasylyev S.,Poznanski D.Zaltzman M.Maoz D.Singer L.Valenti S.Kasen D.,Barnes J.Piran T.Fong W.-F.2018-09-26T07:16:53Z2018-07-16T14:55:20ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomygravitational-wavesapparent-magnitudeWe present an implementation of the Gehrels+ (2016ApJ...820..136G) galaxy-targeted strategy for gravitational-wave (GW) follow-up using the Las Cumbres Observatory global network of telescopes. We use the Galaxy List for the Advanced Detector Era (GLADE) galaxy catalog, which we show is complete (with respect to a Schechter function) out to ~300Mpc for galaxies brighter than the median Schechter function galaxy luminosity. We use a prioritization algorithm to select the galaxies with the highest chance of containing the counterpart given their luminosity, their position, and their distance relative to a GW localization, and in which we are most likely to detect a counterpart given its expected brightness compared to the limiting magnitude of our telescopes. This algorithm can be easily adapted to any expected transient parameters and telescopes. We implemented this strategy during the second Advanced Detector Observing Run (O2) and followed the black hole merger GW170814 and the neutron star merger GW170817. For the latter, we identified an optical kilonova/macronova counterpart thanks to our algorithm selecting the correct host galaxy fifth in its ranked list among the 182 galaxies we identified in the Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo localization.2017ApJ...848L..33Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/848/L33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/275 : GLADE catalog (Dalya+, 2016)VII/267 : Gravitational Wave Galaxy Catalogue (White+ 2011)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)J/ApJ/848/L16 : Counterpart of GW170817. I. DECam obs. (Soares-Santos+, 2017)J/ApJ/848/L29 : Opt. follow-up of GW170817 counterpart (Diaz+, 2017)J/ApJ/851/L21 : UV-NIR obs. compilation of GW170817 counterpart (Villar+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/848/L33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/848/L33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/848/L33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/848/L33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/848/L33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/848/L33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/848/L33/table6 (LCO follow-up observations of LIGO/Virgo localization for GW170817 in descending order of galaxy priority)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/848/L33/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/848/L33/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/848/L33/table6?GETtext/xml+votable180.050000true197.465-24.240.005555555555555556Cone search capability for table J/ApJ/848/L33/table3 (LCO follow-up observations of the initial LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priority)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/848/L33/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/848/L33/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/848/L33/table3?GETtext/xml+votable180.050000true40.52349889-45.337451940.005555555555555556Cone search capability for table J/ApJ/848/L33/table4 (LCO follow-up observations of the updated LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priority)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/848/L33/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/848/L33/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/848/L33/table4?GETtext/xml+votable180.050000true49.25958611-40.445933890.005555555555555556Cone search capability for table J/ApJ/848/L33/table5 (LCO follow-up observations of the Fermi GBM Trigger of GRB170817A in descending order of galaxy priority)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/848/L33/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/848/L33/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/848/L33/table5?GETtext/xml+votable180.050000true204.16272-33.965916110.0055555555555555565/6224 6262 6/24902 24905 24908 24934 24940 24943 24954 25029 25040 25042 25043 25078 25083 33774 33775 33777 34469 34470 34471 35140 35141 35143 35152 35155 35161 43215 43226 43242 43289 43585 43828 43835 43838 43924 43934 43935 43959 43978 44000 44010 440114.0234554602041486e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/848/L33?format=asciiOpticaldefaultJ/ApJ/848/L33/table6LCO follow-up observations of LIGO/Virgo localization for GW170817 in descending order of galaxy priorityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLADE[7/1850989] GLADE identification number (1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-49.5/-11.6] Declination (J2000)degpos.eq.dec;meta.mainDist[9/494] DistanceMpcpos.distance;pos.heliocentricintBmag[8.5/17.3] B-band apparent magnitudemagphot.mag;em.opt.BfloatLB/LB*[0.01/10.3] Schechter luminosity function comparison (2)phys.luminosity.funfloatobsUT date of the observation (1)stime.epoch;obsnullableTelTelescope (1)(3)meta.id;instr.telcharFilt[girw] Filter (1)meta.id;instr.filtercharLim[17.4/23.3]? Limiting magnitude (3{sigma}) (1)phot.magfloatnullable2MASXDisplay data from the 2MASX catalog (VII/233) within 1"meta.ref.urlintnullableHLEDADisplay data from the HyperLEDA catalog (VII/237) within 10"meta.ref.urlintnullableJ/ApJ/848/L33/table3LCO follow-up observations of the initial LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priorityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLADE[7/1850989] GLADE identification number (1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-49.5/-11.6] Declination (J2000)degpos.eq.dec;meta.mainDist[9/494] DistanceMpcpos.distance;pos.heliocentricintBmag[8.5/17.3] B-band apparent magnitudemagphot.mag;em.opt.BfloatLB/LB*[0.01/10.3] Schechter luminosity function comparison (2)phys.luminosity.funfloatobsUT date of the observation (1)stime.epoch;obsnullableTelTelescope (1)(3)meta.id;instr.telcharFilt[girw] Filter (1)meta.id;instr.filtercharLim[17.4/23.3]? Limiting magnitude (3{sigma}) (1)phot.magfloatnullable2MASXDisplay data from the 2MASX catalog (VII/233) within 1"meta.ref.urlintnullableHLEDADisplay data from the HyperLEDA catalog (VII/237) within 10"meta.ref.urlintnullableJ/ApJ/848/L33/table4LCO follow-up observations of the updated LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priorityHLEDADisplay data from the HyperLEDA catalog (VII/237) within 10"meta.ref.urlintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLADE[7/1850989] GLADE identification number (1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-49.5/-11.6] Declination (J2000)degpos.eq.dec;meta.mainDist[9/494] DistanceMpcpos.distance;pos.heliocentricintBmag[8.5/17.3] B-band apparent magnitudemagphot.mag;em.opt.BfloatLB/LB*[0.01/10.3] Schechter luminosity function comparison (2)phys.luminosity.funfloatobsUT date of the observation (1)stime.epoch;obsnullableTelTelescope (1)(3)meta.id;instr.telcharFilt[girw] Filter (1)meta.id;instr.filtercharLim[17.4/23.3]? Limiting magnitude (3{sigma}) (1)phot.magfloatnullable2MASXDisplay data from the 2MASX catalog (VII/233) within 1"meta.ref.urlintnullableJ/ApJ/848/L33/table5LCO follow-up observations of the Fermi GBM Trigger of GRB170817A in descending order of galaxy priorityDist[9/494] DistanceMpcpos.distance;pos.heliocentricintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLADE[7/1850989] GLADE identification number (1)meta.id;meta.mainintDEJ2000[-49.5/-11.6] Declination (J2000)degpos.eq.dec;meta.mainBmag[8.5/17.3] B-band apparent magnitudemagphot.mag;em.opt.BfloatLB/LB*[0.01/10.3] Schechter luminosity function comparison (2)phys.luminosity.funfloatobsUT date of the observation (1)stime.epoch;obsnullableTelTelescope (1)(3)meta.id;instr.telcharFilt[girw] Filter (1)meta.id;instr.filtercharLim[17.4/23.3]? Limiting magnitude (3{sigma}) (1)phot.magfloatnullable2MASXDisplay data from the 2MASX catalog (VII/233) within 1"meta.ref.urlintnullableHLEDADisplay data from the HyperLEDA catalog (VII/237) within 10"meta.ref.urlintnullable