O. Adriani, Università degli Studi di FirenzeFollow
Y. Akaike, University of Maryland, Baltimore County (UMBC)Follow
K. Asano, The University of Tokyo
Y. Asaoka, Waseda University
M. G. Bagliesi, Università degli Studi di Siena
E. Berti, Università degli Studi di Firenze
G. Bigongiari, Università degli Studi di Siena
W. R. Binns, Washington University in St. Louis
S. Bonechi, Università degli Studi di Siena
M. Bongi, Università degli Studi di Firenze
P. Brogi, Università degli Studi di Siena
J. H. Buckley, Washington University in St. Louis
N. Cannady, Louisiana State University
G. Castellini, Consiglio Nazionale delle Ricerche
C. Checchia, Università degli Studi di Padova
M. L. Cherry, Louisiana State University
G. Collazuol, Università degli Studi di Padova
V. Di Felice, Università degli Studi di Roma "Tor Vergata"
K. Ebisawa, JAXA Institute of Space and Astronautical Science
H. Fuke, JAXA Institute of Space and Astronautical Science
T. G. Guzik, Louisiana State University
T. Hams, University of Maryland, Baltimore County (UMBC)
M. Hareyama, St. Marianna University School of Medicine
N. Hasebe, Waseda University
K. Hibino, Kanagawa University
M. Ichimura, Hirosaki University
K. Ioka, Yukawa Institute for Theoretical Physics
W. Ishizaki, The University of Tokyo
M. H. Israel, Washington University in St. Louis
K. Kasahara, Waseda University
J. Kataoka, Waseda University
R. Kataoka, National Institute of Polar Research
Y. Katayose, Yokohama National University

Document Type

Article

Publication Date

8-20-2018

Abstract

We present the results of searches for gamma-ray counterparts of the LIGO/Virgo gravitational wave events using CALorimetric Electron Telescope (CALET) observations. The main instrument of CALET, CALorimeter (CAL), observes gamma-rays from ∼1 GeV up to 10 TeV with a field of view (FOV) of nearly 2 sr. In addition, the CALET gamma-ray burst monitor views ∼3 sr and ∼2π sr of the sky in the 7 keV-1 MeV and the 40 keV-20 MeV bands, respectively, by using two different crystal scintillators. The CALET observations on the International Space Station started in 2015 October, and here we report analyses of events associated with the following gravitational wave events: GW151226, GW170104, GW170608, GW170814, and GW170817. Although only upper limits on gamma-ray emission are obtained, they correspond to a luminosity of 1049 ∼ 1053 erg s-1 in the GeV energy band depending on the distance and the assumed time duration of each event, which is approximately on the order of luminosity of typical short gamma-ray bursts. This implies that there will be a favorable opportunity to detect high-energy gamma-ray emission in further observations if additional gravitational wave events with favorable geometry will occur within our FOV. We also show the sensitivity of CALET for gamma-ray transient events, which is on the order of 10-7 erg cm-2 s-1 for an observation of 100 s in duration.

Publication Source (Journal or Book title)

Astrophysical Journal

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