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Savchenko, V.; Ferrigno, C.; Mereghetti, S.; Natalucci, L.; Bazzano, A.; Bozzo, E.; Brandt, S.; Courvoisier, T. J.-L.; Diehl, R.; Hanlon, L.; Kienlin, A. von; Kuulkers, E.; Laurent, P.; Lebrun, F.; Roques, J. P.; Ubertini, P.; Weidenspointner, G.
Astrophysical journal. Letters, 04/2016, Letnik: 820, Številka: 2Journal Article
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, 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 erg cm−2 to 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 E E . 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.
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