{
  "bibcode": "2012GCN.13346....1M",
  "body": "M. Morii, N. Kawai, R. Usui, K. Ishikawa (Tokyo Tech),\nM. Serino, T. Mihara, M. Sugizaki, T. Yamamoto,\nM. Matsuoka (RIKEN),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa (JAXA),\nH. Negoro, M. Nakajima, N. Serita, M. Asada, H. Sakakibara (Nihon U.),\nA. Yoshida (AGU),\nH. Tsunemi, M. Kimura (Osaka U.),\nY. Ueda, K. Hiroi, M. Shidatsu, R. Sato (Kyoto U.),\nY. Tsuboi, M. Higa (Chuo U.)\nM. Yamauchi, Y. Nishimura, T. Hanayama, K. Yoshidome (Miyazaki U.),\nK. Yamaoka (Waseda U.)\nreport on behalf of the MAXI team:\n\nMAXI/GSC triggered at 2012-05-28T18:12:08 UT on a bright uncatalogued\nX-ray transient source.\nThe transient emission lasted at least for 20.0 seconds\nwithin the 40.0 second long triangular transit response of\nMAXI/GSC. We identify this event as GRB 120528B.\n\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n\n(R.A., Dec) = (+77.59 deg, -37.80 deg) = (05 10 21, -37 47 50)(J2000)\n\nwith a rectangular statistical error box (90%C.L.) of the following corners:\n\n(R.A., Dec) = (+77.23 deg, -37.92 deg) = (05 08 56, -37 54 60)(J2000)\n(R.A., Dec) = (+77.56 deg, -38.12 deg) = (05 10 16, -38 07 15)(J2000)\n(R.A., Dec) = (+77.96 deg, -37.71 deg) = (05 11 51, -37 42 47)(J2000)\n(R.A., Dec) = (+77.63 deg, -37.51 deg) = (05 10 31, -37 30 36)(J2000)\n\nThere is an additional systematic uncertainty of 0.1 deg (90%\ncontainment radius).\n\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n\n(R.A., Dec) = (+76.80 deg, -37.54 deg) = (05 07 12, -37 32 34)(J2000)\n(R.A., Dec) = (+77.09 deg, -37.25 deg) = (05 08 21, -37 15 0)(J2000)\n(R.A., Dec) = (+78.38 deg, -38.05 deg) = (05 13 31, -38 02 57)(J2000)\n(R.A., Dec) = (+78.09 deg, -38.35 deg) = (05 12 22, -38 20 42)(J2000)\n\nThe X-ray flux averaged over the scan was 285 +65/-58 mCrab (4-10 keV,\n1 sigma error).\n\nFollow-up observations are encouraged.",
  "circularId": 13346,
  "createdOn": 1338255708000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 120528B: MAXI/GSC detection",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 120528B"
}