{
  "bibcode": "2019GCN.24091....1N",
  "body": "H. Negoro (Nihon U.), M. Serino, S. Sugita (AGU), M. Sugizaki, N. Kawai (Tokyo Tech),\nM. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.),\nS. Nakahira, T. Mihara, M. Matsuoka (RIKEN), T. Sakamoto, A. Yoshida (AGU),\nY. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), \nY. Tachibana, K. Morita, M. Oeda, K. Shiraishi (Tokyo Tech), \nS. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N.Isobe, R. Shimomukai,\nM. Tominaga (JAXA), Y. Ueda, A. Tanimoto, T. Morita, S. Yamada, \nS. Ogawa (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.),\nM. Yamauchi, S. Iwahori, Y. Kurihara (Miyazaki U.), T. Kawamuro (NAOJ),\nK. Yamaoka (Nagoya U.), Y. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nAt the LVC trigger time of S190408an, 18:18:02.29 UT on 2019 April 8 \n(LIGO/Virgo Collaboration, GCN Circ. 24069), MAXI/GSC was scanning a part of \nthe 50% credible region, centered around (R.A., Dec) = (333 deg, 20 deg),\nbut no flaring event was detected.\nFor one orbital period about 92 min, MAXI covered about 82% of the 90% \ncredible region. Any enhancement was recognized in the region, and a typical \n(averaged) 1-sigma upper limit was 28 mCrab at 2-20 keV. MAXI observed \nthe whole 90% credible region in 6 hours, and we put upper limits\nof typically about 15 mCrab, and partially about 50 mCrab for the regions \nobserved with the degraded GSC_3 camera.\n\nFinally we note that MAXI detected GRB 190408A prior to the LVC trigger by \n12 min (Sugita et al. GCN Circ. 24072). The burst was relatively short \n(~ 10 sec) and soft, but the GRB location, (R.A., Dec) = (47.3 deg, 1.8 deg), \nis far from the GW localization region.\nThus, an association between these events is likely low.",
  "circularId": 24091,
  "createdOn": 1554905198000,
  "email": "negoro@cygnus.phys.cst.nihon-u.ac.jp",
  "subject": "LIGO/Virgo S190408an: MAXI/GSC Observations",
  "submitter": "Hitoshi Negoro at Nihon U  <negoro@cygnus.phys.cst.nihon-u.ac.jp>",
  "eventId": "LIGO/Virgo S190408an"
}