INTEGRAL Upper Limits on Gamma-Ray Emission Associated with the Gravitational Wave Event GW150914

V. Savchenko, C. Ferrigno, S. Mereghetti, L. Natalucci, A. Bazzano, E. Bozzo, Søren Brandt, T. J. -L. Courvoisier, R. Diehl, L. Hanlon, A. von Kienlin, E. Kuulkers, P. Laurent, F. Lebrun, J. P. Roques, P. Ubertini, G. Weidenspointner

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    Using observations of the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), we place upper limits on the gamma-ray and hard X-ray prompt emission associated with the gravitational wave event GW150914, which was discovered by the LIGO/Virgo Collaboration. The omnidirectional view of the INTEGRAL/SPI-ACS has allowed us to constrain the fraction of energy emitted in the hard X-ray electromagnetic component for the full high-probability sky region of LIGO triggers. Our upper limits on the hard X-ray fluence at the time of the event range from Fγ = 2 x 10-8 erg cm-2 to Fγ = 10-6 erg cm-2 in the 75 keV-2 MeV energy range for typical spectral models. Our results constrain the ratio of the energy promptly released in gamma-rays in the direction of the observer to the gravitational wave energy Eγ/EGW <10-6. We discuss the implication of gamma-ray limits for the characteristics of the gravitational wave source, based on the available predictions for prompt electromagnetic emission.
    Original languageEnglish
    Article numberL36
    JournalThe Astrophysical Journal Letters
    Issue number2
    Number of pages5
    Publication statusPublished - 2016


    • Gamma-ray burst: general
    • Gravitational waves


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