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CALET Search for electromagnetic counterparts of gravitational waves during the LIGO/Virgo O3 run

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arxiv 2207.03621 v1 pith:OXESIRMM submitted 2022-07-07 astro-ph.HE

CALET Search for electromagnetic counterparts of gravitational waves during the LIGO/Virgo O3 run

O. Adriani , Y. Akaike , K. Asano , Y. Asaoka , E. Berti , G. Bigongiari , W.R. Binns , M. Bongi
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P. Brogi A. Bruno J.H. Buckley N. Cannady G. Castellini C. Checchia M.L. Cherry G. Collazuol K. Ebisawa A. W. Ficklin H. Fuke S. Gonzi T.G. Guzik T. Hams K. Hibino M. Ichimura K. Ioka W. Ishizaki M.H. Israel K. Kasahara J. Kataoka R. Kataoka Y. Katayose C. Kato N. Kawanaka Y. Kawakubo K. Kobayashi K. Kohri H.S. Krawczynski J.F. Krizmanic P. Maestro P.S. Marrocchesi A.M. Messineo J.W. Mitchell S. Miyake A.A. Moiseev M. Mori N. Mori H.M. Motz K. Munakata S. Nakahira J. Nishimura G.A. de Nolfo S. Okuno J.F. Ormes N. Ospina S. Ozawa L. Pacini P. Papini B.F. Rauch S.B. Ricciarini K. Sakai T. Sakamoto M. Sasaki Y. Shimizu A. Shiomi P. Spillantini F. Stolzi S. Sugita A. Sulaj M. Takita T. Tamura T. Terasawa S. Torii Y. Tsunesada Y. Uchihori E. Vannuccini J.P. Wefel K. Yamaoka S. Yanagita A. Yoshida K. Yoshida W. V. Zober
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classification astro-ph.HE
keywords gammacaletcalorimetercgbmrayssearchsensitiveconsisting
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The CALorimetric Electron Telescope (CALET) on the International Space Station (ISS) consists of a high-energy cosmic ray CALorimeter (CAL) and a lower-energy CALET Gamma ray Burst Monitor (CGBM). CAL is sensitive to electrons up to 20 TeV, cosmic ray nuclei from Z = 1 through Z $\sim$ 40, and gamma rays over the range 1 GeV - 10 TeV. CGBM observes gamma rays from 7 keV to 20 MeV. The combined CAL-CGBM instrument has conducted a search for gamma ray bursts (GRBs) since Oct. 2015. We report here on the results of a search for X-ray/gamma ray counterparts to gravitational wave events reported during the LIGO/Virgo observing run O3. No events have been detected that pass all acceptance criteria. We describe the components, performance, and triggering algorithms of the CGBM - the two Hard X-ray Monitors (HXM) consisting of LaBr$_{3}$(Ce) scintillators sensitive to 7 keV to 1 MeV gamma rays and a Soft Gamma ray Monitor (SGM) BGO scintillator sensitive to 40 keV to 20 MeV - and the high-energy CAL consisting of a CHarge-Detection module (CHD), IMaging Calorimeter (IMC), and fully active Total Absorption Calorimeter (TASC). The analysis procedure is described and upper limits to the time-averaged fluxes are presented.

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