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INTEGRAL upper limits on gamma-ray emission associated with the gravitational wave event GW150914

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


International audienceUsing 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 ${F}_{\gamma }=2\times {10}^{-8}$ erg cm(−)(2) to ${F}_{\gamma }={10}^{-6}$ 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 E${}_{\gamma }/$E${}_{\mathrm{GW}}\lt {10}^{-6}$. 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

Topics: trigger, spectral, electromagnetic, X-ray, electromagnetic component, VIRGO, gamma ray: flux, energy: ratio, energy: emission, gamma ray: emission, gamma-ray burst: general, gravitational waves, gravitational radiation: energy, LIGO, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Publisher: 'American Astronomical Society'
Year: 2016
DOI identifier: 10.3847/2041-8205/820/2/L36
OAI identifier: oai:HAL:hal-01553929v1
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