{
  "bibcode": "2019GCN.24048....1N",
  "body": "M. Nakajima, H. Negoro (Nihon U.), W. Iwakiri (Chuo U.), \nW. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), \nS. Nakahira, T. Mihara, M. Matsuoka (RIKEN), \nT. Sakamoto, M. Serino, S. Sugita, T. Hashimoto, A. Yoshida (AGU), \nY. Tsuboi, R. Sasaki, H. Kawai, T. Sato (Chuo U.), N. Kawai, M. Sugizaki, \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.), M. Shidatsu (Ehime U.), Y. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray \ntransient source at 12:24:20 UT on 2019 April 4. Assuming that the source \nflux was constant over the transit, we obtain the source position at\n(R.A., Dec) = (12.088 deg, 27.486 deg) = (00 48 21, +27 29 09) (J2000) \nwith a statistical 90% C.L. elliptical error region \nwith long and short radii of 0.13 deg and 0.12 deg, respectively.\nThe roll angle of the long axis from the north direction is 136.0 deg \ncounterclockwise. \n  Without assumptions on the source constancy, we obtain a rectangular error box\nfor the transient source with the following corners: \n(12.621, 28.061) deg = (00 50 29, +28 03 39) (J2000) \n(12.378, 28.204) deg = (00 49 30, +28 12 14) (J2000) \n(11.610, 27.173) deg = (00 46 26, +27 10 22) (J2000) \n(11.851, 27.032) deg = (00 47 24, +27 01 55) (J2000)\nThere is an additional systematic uncertainty of 0.1 deg (90% containment \nradius).\n\nThe X-ray flux averaged over the scan was 399 +- 41 mCrab (4.0-10.0keV, \n1 sigma error). There was no significant excess flux in the previous transit \nat 10:51 UT on 2019 April 4 with an upper limit of 20 mCrab.\n\nNote that we noticed that Fermi had detected a GRB at 07:01 on April 4.\nThen, we rename this burst, referred to as GRB 190304A in the MAXI \nnew-transient ML, GRB 190404B. We apologize for a series of mistakes.",
  "circularId": 24048,
  "createdOn": 1554387968000,
  "email": "negoro@phys.cst.nihon-u.ac.jp",
  "subject": "GRB 140404B: MAXI/GSC detection",
  "submitter": "H. Negoro at Nihon U.  <negoro@phys.cst.nihon-u.ac.jp>",
  "eventId": "GRB 140404B"
}