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

V. Savchenko, C. Ferrigno, L. Natalucci, A. Bazzano, E. Bozzo, T. J. -L. Courvoisier, Søren Brandt, L. Hanlon, E. Kuulkers, P. Laurent, F. Lebrun, J. P. Roques, P. Ubertini

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Abstract

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, 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
Publication date2016
Number of pages1
Publication statusPublished - 2016
EventAmerican Astronomical Society Head 15th Divisional Meeting - Naples, Italy
Duration: 3 Apr 20167 Apr 2016

Conference

ConferenceAmerican Astronomical Society Head 15th Divisional Meeting
Country/TerritoryItaly
CityNaples
Period03/04/201607/04/2016

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