Search for GeV Gamma-ray Counterparts of Gravitational Wave Events by CALET
Creators: name: Adriani, O.
name: Akaike, Y.
name: Asano, K.
name: Asaoka, Y.
name: Bagliesi, M. G.
name: Berti, E.
name: Bigongiari, G.
name: Binns, W. R.
name: Bonechi, S.
name: Bongi, M.
name: Brogi, P.
name: Buckley, J. H.
name: Cannady, N.
name: Castellini, G.
name: Checchia, C.
name: Cherry, M. L.
name: Collazuol, G.
name: Di Felice, V.
name: Ebisawa, K.
name: Fuke, H.
name: Guzik, T. G.
name: Hams, T.
name: Hareyama, M.
name: Hasebe, N.
name: Hibino, K.
name: Ichimura, M.
name: Ioka, K.
name: Ishizaki, W.
name: Israel, M. H.
name: Kasahara, K.
name: Kataoka, J.
name: Kataoka, R.
name: Katayose, Y.
name: Kato, C.
name: Kawanaka, N.
name: Kawakubo, Y.
name: Krawczynski, H. S.
name: Krizmanic, J. F.
name: Kohri, K.
name: Lomtadze, T.
name: Maestro, P.
name: Marrocchesi, P. S.
name: Messineo, A. M.
name: Mitchell, J. W.
name: Miyake, S.
name: Moiseev, A. A.
name: Mori, K.
name: Mori, M.
name: Mori, N.
name: Motz, H. M.
name: Munakata, K.
name: Murakami, H.
name: Nakahira, S.
name: Nishimura, J.
name: de Nolfo, G. A.
name: Okuno, S.
name: Ormes, J. F.
name: Ozawa, S.
name: Pacini, L.
name: Palma, F.
name: Papini, P.
name: Penacchioni, A. V.
name: Rauch, B. F.
name: Ricciarini, S. B.
name: Sakai, K.
name: Sakamoto, T.
name: Sasaki, M.
name: Shimizu, Y.
name: Shiomi, A.
name: Sparvoli, R.
name: Spillantini, P.
name: Stolzi, F.
name: Suh, J. E.
name: Sulaj, A.
name: Takahashi, I.
name: Takayanagi, M.
name: Takita, M.
name: Tamura, T.
name: Tateyama, N.
name: Terasawa, T.
name: Tomida, H.
name: Torii, S.
name: Tsunesada, Y.
name: Uchihori, Y.
name: Ueno, S.
name: Vannuccini, E.
name: Wefel, J. P.
name: Yamaoka, K.
name: Yanagita, S.
name: Yoshida, A.
name: Yoshida, K.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present results on searches for gamma-ray counterparts of the LIGO/Virgo gravitational-wave events using CALorimetric Electron Telescope ({\sl CALET}) observations. The main instrument of {\sl CALET}, CALorimeter (CAL), observes gamma-rays from $\sim1$ GeV up to 10 TeV with a field of view of nearly 2 sr. In addition, the {\sl CALET} gamma-ray burst monitor (CGBM) views $\sim$3 sr and $\sim2π$ 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 {\sl CALET} observations on the International Space Station started in October 2015, 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 $10^{49}\sim10^{53}$ erg s$^{-1}$ in the GeV energy band depending on the distance and the assumed time duration of each event, which is approximately the order of luminosity of typical short gamma-ray bursts. This implies 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 field-of-view. We also show the sensitivity of {\sl CALET} for gamma-ray transient events which is the order of $10^{-7}$~erg\,cm$^{-2}$\,s$^{-1}$ for an observation of 100~s duration.
description: 12 pages, 8 figures, 1 table. Accepted for publication in Astrophysical Journal