Localization And Broadband Follow-Up Of The Gravitational-Wave Transient Gw 150914

Australian Square Kilometer Array Pathfinder (ASKAP) Collaboration, BOOTES Collaboration, Dark Energy Camera GW-EM Collabor, Dark Energy Survey and the Dark Energy Camera GW-EM Collaborations, Fermi GBM Collaboration, Fermi LAT Collaboration, GRAvitational Wave Inaf TeAm (GRAWITA), INTEGRAL Collaboration, InterPlanetary Network, Intermediate Palomar Transient Factory (iPTF) Collaboration, J-GEM Collaboration, La Silla-QUEST Survey, LIGO Scientific Collaboration, Liverpool Telescope Collaboration, Low Frequency Array (LOFAR) Collaboration, MASTER Collaboration, MAXI Collaboration, Murchison Wide-field Array (MWA) Collaboration, Pan-STARRS Collaboration, PESSTO CollaborationPi of the Sky Collaboration, SkyMapper Collaboration, Swift Collaboration, TAROT Collaboration, TOROS Collaboration, Virgo Collaboration, VISTA Collaboration

Research output: Contribution to journalArticleAcademicpeer-review


A gravitational-wave (GW) transient was identified in data recorded by the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) detectors on 2015 September 14. The event, initially designated G184098 and later given the name GW150914, is described in detail elsewhere. By prior arrangement, preliminary estimates of the time, significance, and sky location of the event were shared with 63 teams of observers covering radio, optical, near-infrared, X-ray, and gamma-ray wavelengths with ground- and space-based facilities. In this Letter we describe the low-latency analysis of the GW data and present the sky localization of the first observed compact binary merger. We summarize the follow-up observations reported by 25 teams via private Gamma-ray Coordinates Network circulars, giving an overview of the participating facilities, the GW sky localization coverage, the timeline, and depth of the observations. As this event turned out to be a binary black hole merger, there is little expectation of a detectable electromagnetic (EM) signature. Nevertheless, this first broadband campaign to search for a counterpart of an Advanced LIGO source represents a milestone and highlights the broad capabilities of the transient astronomy community and the observing strategies that have been developed to pursue neutron star binary merger events. Detailed investigations of the EM data and results of the EM follow-up campaign are being disseminated in papers by the individual teams.
Original languageEnglish
Article numberL13
Number of pages8
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 20 Jul 2016
Externally publishedYes


  • gravitational waves
  • methods: observational


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