MAXI/GSC observations of IceCube-160731A
ATel #9313; H. Negoro, T. Masumitsu, K. Tanaka (Nihon U.), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, Y. E. Nakagawa, Y. Sugawara (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, W. Iwakiri, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, N. Isobe, S. Sugita, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka (AGU), H. Tsunemi, R. Shomura (Osaka U.), M. Nakajima, T. Kawase (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori, A. Tanimoto (Kyoto U.), Y. Tsuboi, Y. Nakamura, R. Sasaki (Chuo U.), M. Yamauchi, K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 4 Aug 2016; 01:14 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Neutrinos, Transient
We report on MAXI/GSC observations of the neutrino event IceCube-160731A (AMON ICECUBE HESE 128290 6888376: ATel #9294 (Swift/XRT), #9295 (AGILE), #9298 (MASTER), #9301 (H.E.S.S.), #9303 (Fermi/LAT); GCN #19743 (HAWC), #19752 (FACT), #19758 (Fermi/GBM), #19760 (iPTF P48)).
At 02:32 UT on 2016 July 31 (about 37 min after the IceCube event trigger), MAXI/GSC scanned the error region of the event at (R.A., Dec) = (214.54, -0.33) with a radius of 0.75 deg. No significant excess emission was detected from the region, and
we obtained the 2-20 keV 3-sigma upper limit of 0.104 photons/cm2/s (corresponding to approximately 32 mCrab) for a point source at the above position.
We also investigated transient events around the region from 2016 July 20 to August 3, but no significant events were found. A typical 2-20 keV 3-sigma upper limit for one day was 0.03 photons/cm2/s (~9 mCrab). MAXI continues to observe the region every 92 min.
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