{
  "id": "1602.04180",
  "version": "v1",
  "published": "2016-02-12T19:31:55.000Z",
  "updated": "2016-02-12T19:31:55.000Z",
  "title": "INTEGRAL upper limits on gamma-ray emission associated with the gravitational wave event GW150914",
  "authors": [
    "V. Savchenko",
    "C. Ferrigno",
    "S. Mereghetti",
    "L. Natalucci",
    "A. Bazzano",
    "E. Bozzo",
    "T. J. -L. Courvoisier",
    "S. Brandt",
    "L. Hanlon",
    "E. Kuulkers",
    "P. Laurent",
    "F. Lebrun",
    "J. P. Roques",
    "P. Ubertini",
    "G. Weidenspointner"
  ],
  "comment": "submitted to ApJL",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Using observations of the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), we put tight upper limits on the gamma-ray and hard X-ray prompt emission associated with the gravitational wave event \\gwevent, discovered by the LIGO/Virgo collaboration. The omni-directional 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/Virgo trigger. 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$_{GW}<10^{-6}$. We discuss the implication of gamma-ray limits on the characteristics of the gravitational wave source, based on the available predictions for prompt electromagnetic emission.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-02-12T19:31:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gravitational wave event gw150914",
      "integral upper limits",
      "gamma-ray emission",
      "hard x-ray prompt emission"
    ],
    "publication": {
      "doi": "10.3847/2041-8205/820/2/L36"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1421416
    }
  }
}