{
  "bibcode": "2014GCN.16855....1N",
  "body": "H. Negoro (Nihon U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), \nT. Mihara, M. Sugizaki, M. Morii, M. Serino, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), \nN. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), \nA. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), \nH. Tsunemi, D. Uchida (Osaka U.), \nM. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, M. Fujita, F. Honda (Nihon U.), \nY. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), \nY. Tsuboi, A. Kawagoe (Chuo U.), \nM. Yamauchi, Y. Morooka (Miyazaki U.), \nK. Yamaoka (Nagoya U.) ,\nreport on behalf of the MAXI team:\n\nA bright uncatalogued X-ray transient source was detected with MAXI/GSC \nat UT 2014-09-30T14:26. Assuming that the source flux was constant over \nthe transit, we obtain the source position at\n\n(R.A., Dec) = (344.875 deg, 52.428 deg) = (22 59 30, +52 25 40) (J2000), \nequivalently (l, b) = (106.186 deg, -6.766 deg), \n\nwith a 90% C.L. statistical error of 0.40 deg and an additional systematic \nuncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 136 +- 30 mCrab (4-10 keV, \n1 sigma error). There was no significant excess flux in the previous transit \nat UT 2014-09-30T12:54.\n\nThe nature of the source is quite unknown. Since the source is located \nnear the Galactic plane (l ~ -6.8 deg), this event might be an X-ray burst \nfrom a low mass X-ray binary near the Galactic plane. We tentatively name \nthe source GRB 140930A and MAXI J2259+524 (originally, MAXI J2256+527\nin the MAXI ML. \"New-transient: 115\").",
  "circularId": 16855,
  "createdOn": 1412098036000,
  "email": "negoro@phys.cst.nihon-u.ac.jp",
  "subject": "GRB 140930A/MAXI J2259+524: MAXI-GSC detection",
  "submitter": "H. Negoro at Nihon U.  <negoro@phys.cst.nihon-u.ac.jp>",
  "eventId": "GRB 140930A"
}