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http://hdl.handle.net/20.500.12386/24742
Title: | INTEGRAL Upper Limits on Gamma-Ray Emission Associated with the Gravitational Wave Event GW150914 | Authors: | Savchenko, V. Ferrigno, C. MEREGHETTI, Sandro NATALUCCI, LORENZO BAZZANO, ANGELA Bozzo, E. Brandt, S. Courvoisier, T. J. -L. Diehl, R. Hanlon, L. von Kienlin, A. Kuulkers, E. Laurent, P. Lebrun, F. Roques, J. P. Ubertini, P. Weidenspointner, G. |
Issue Date: | 2016 | Journal: | THE ASTROPHYSICAL JOURNAL LETTERS | Number: | 820 | Issue: | 2 | First Page: | L36 | 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 {F}<SUB>γ </SUB>=2× {10}<SUP>-8</SUP> erg cm<SUP>-2</SUP> to {F}<SUB>γ </SUB>={10}<SUP>-6</SUP> erg cm<SUP>-2</SUP> 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 {}<SUB>γ </SUB>/ E {}<SUB>{GW</SUB>}\lt {10}<SUP>-6</SUP>. 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. | URI: | http://hdl.handle.net/20.500.12386/24742 | URL: | https://iopscience.iop.org/article/10.3847/2041-8205/820/2/L36 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8205/820/2/L36 | Bibcode ADS: | 2016ApJ...820L..36S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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