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We present the results of the detailed analysis of an optical imaging survey conducted using the Subaru / Hyper Suprime-Cam (HSC), which aims to identify an optical counterpart to the gravitational wave event GW151226. In half a night, the…

The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (a.k.a. S200224ca) and classified as a binary-black-hole coalescence, on February 24, 2020. Given its relatively small localization skymap (71 deg$^2$ for a 90%…

We present the results from a search for the electromagnetic counterpart of the LIGO/Virgo event S190510g using the Dark Energy Camera (DECam). S190510g is a binary neutron star (BNS) merger candidate of moderate significance detected at a…

We report the results of optical--infrared follow-up observations of the gravitational wave (GW) event GW151226 detected by the Advanced LIGO in the framework of J-GEM (Japanese collaboration for Gravitational wave ElectroMagnetic…

We report our near-infrared (NIR) follow-up observations of the gravitational wave (GW) event S240422ed using the Subaru Telescope/MOIRCS. S240422ed was initially classified as a black hole-neutron star merger with $>$ 99% probability of…

We perform a $z$-band survey for an optical counterpart of a binary neutron star coalescence GW170817 with Subaru/Hyper Suprime-Cam. Our untargeted transient search covers $23.6$ deg$^2$ corresponding to the $56.6\%$ credible region of…

On 2019 April 25.346 and 26.640 UT the LIGO and Virgo gravitational wave (GW) observatories announced the detection of the first candidate events in Observing Run 3 that contain at least one neutron star. S190425z is a likely binary neutron…

The first two months of the third Advanced LIGO and Virgo observing run (2019 April-May) showed that distant gravitational wave (GW) events can now be readily detected. Three candidate mergers containing neutron stars (NS) were reported in…

We present an overview of the SkyMapper optical follow-up program for gravitational-wave event triggers from the LIGO/Virgo observatories, which aims at identifying early GW170817-like kilonovae out to $\sim 200$ Mpc distance. We describe…

Instrumentation and Methods for Astrophysics · Physics 2021-05-26 Seo-Won Chang , Christopher A. Onken , Christian Wolf , Lance Luvaul , Anais Möller , Richard Scalzo , Brian P. Schmidt , Susan M. Scott , Nikunj Sura , Fang Yuan

The gravitational wave (GW) event S230518h is a potential binary neutron star-black hole merger (NSBH) event that was detected during engineering run 15 (ER15), which served as the commissioning period before the LIGO-Virgo-KAGRA (LVK) O4a…

We report the results of a Dark Energy Camera (DECam) optical follow-up of the gravitational wave (GW) event GW151226, discovered by the Advanced LIGO detectors. Our observations cover 28.8 deg$^2$ of the localization region in the $i$ and…

We present an overview of a deep transient survey of the COSMOS field with the Subaru Hyper Suprime-Cam (HSC). The survey was performed for the 1.77 deg$^2$ ultra-deep layer and 5.78 deg$^2$ deep layer in the Subaru Strategic Program over…

On 2019 August 14, the LIGO and Virgo interferometers detected a high-significance event labelled S190814bv. Preliminary analysis of the GW data suggests that the event was likely due to the merger of a compact binary system formed by a BH…

Solar and Stellar Astrophysics · Physics 2020-11-11 K. Ackley , L. Amati , C. Barbieri , F. E. Bauer , S. Benetti , M. G. Bernardini , K. Bhirombhakdi , M. T. Botticella , M. Branchesi , E. Brocato , S. H. Bruun , M. Bulla , S. Campana , E. Cappellaro , A. J. Castro-Tirado , K. C. Chambers , S. Chaty , T. -W. Chen , R. Ciolfi , A. Coleiro , C. M. Copperwheat , S. Covino , R. Cutter , F. D'Ammando , P. D'Avanzo , G. De Cesare , V. D'Elia , M. Della Valle , L. Denneau , M. De Pasquale , V. S. Dhillon , M. J. Dyer , N. Elias-Rosa , P. A. Evans , R. A. J. Eyles-Ferris , A. Fiore , M. Fraser , A. S. Fruchter , J. P. U. Fynbo , L. Galbany , C. Gall , D. K. Galloway , F. I. Getman , G. Ghirlanda , J. H. Gillanders , A. Gomboc , B. P. Gompertz , C. González-Fernández , S. González-Gaitán , A. Grado , G. Greco , M. Gromadzki , P. J. Groot , C. P. Gutiérrez , T. Heikkilä , K. E. Heintz , J. Hjorth , Y. -D. Hu , M. E. Huber , C. Inserra , L. Izzo , J. Japelj , A. Jerkstrand , Z. P. Jin , P. G. Jonker , E. Kankare , D. A. Kann , M. Kennedy , S. Kim , S. Klose , E. C. Kool , R. Kotak , H. Kuncarayakti , G. P. Lamb , G. Leloudas , A. J. Levan , F. Longo , T. B. Lowe , J. D. Lyman , E. Magnier , K. Maguire , E. Maiorano , I. Mandel , M. Mapelli , S. Mattila , O. R. McBrien , A. Melandri , M. J. Michałowski , B. Milvang-Jensen , S. Moran , L. Nicastro , M. Nicholl , A. Nicuesa Guelbenzu , L. Nuttal , S. R. Oates , P. T. O'Brien , F. Onori , E. Palazzi , B. Patricelli , A. Perego , M. A. P. Torres , D. A. Perley , E. Pian , G. Pignata , S. Piranomonte , S. Poshyachinda , A. Possenti , M. L. Pumo , J. Quirola-Vásquez , F. Ragosta , G. Ramsay , A. Rau , A. Rest , T. M. Reynolds , S. S. Rosetti , A. Rossi , S. Rosswog , N. B. Sabha , A. Sagués Carracedo , O. S. Salafia , L. Salmon , R. Salvaterra , S. Savaglio , L. Sbordone , P. Schady , P. Schipani , A. S. B. Schultz , T. Schweyer , S. J. Smartt , K. W. Smith , M. Smith , J. Sollerman , S. Srivastav , E. R. Stanway , R. L. C. Starling , D. Steeghs , G. Stratta , C. W. Stubbs , N. R. Tanvir , V. Testa , E. Thrane , J. L. Tonry , M. Turatto , K. Ulaczyk , A. J. van der Horst , S. D. Vergani , N. A. Walton , D. Watson , K. Wiersema , K. Wiik , L. Wyrzykowski , S. Yang , S. -X. Yi , D. R. Young

On November 12th, 2025 the LIGO--Virgo--KAGRA (LVK) collaboration reported gravitational waves (GWs) from a compact object merger candidate (S251112cm) with at least one sub-solar mass component. Using the Dark Energy Camera (DECam), the…

On 14 August 2019, the LIGO and Virgo Collaborations detected gravitational waves from a black hole and a 2.6 solar mass compact object, possibly the first neutron star -- black hole (NSBH) merger. In search of an optical counterpart, the…

We present observations of two strong-lensing galaxy clusters located within the $90$ per cent credible sky localization maps released following LIGO-Virgo's discovery of the binary black hole (BH-BH) gravitational wave (GW) source…

High Energy Astrophysical Phenomena · Physics 2019-05-07 G. P. Smith , M. Bianconi , M. Jauzac , J. Richard , A. Robertson , C. P. L. Berry , R. Massey , K. Sharon , W. M. Farr , J. Veitch

The Advanced LIGO and Virgo gravitational wave observatories detected a signal on 2019 August 14 during their third observing run, named GW190814. A large number of electromagnetic facilities conducted follow-up campaigns in the search for…

High Energy Astrophysical Phenomena · Physics 2021-05-19 S. de Wet , P. J. Groot , S. Bloemen , R. Le Poole , M. Klein-Wolt , E. Körding , V. McBride , K. Paterson , D. L. A. Pieterse , P. M. Vreeswijk , P. Woudt

Estimates of the source sky location for gravitational wave signals are likely span areas ranging up to hundreds of square degrees or more, making it very challenging for most telescopes to search for counterpart signals in the…

High Energy Astrophysical Phenomena · Physics 2017-01-20 Man Leong Chan , Yi-Ming Hu , Chris Messenger , Martin Hendry , Ik Siong Heng
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