{
  "subject": "GRB 150430A: MAXI/GSC detection",
  "eventId": "GRB 150430A",
  "bibcode": "2015GCN.17791....1F",
  "createdOn": 1430388571000,
  "circularId": 17791,
  "submitter": "H. Negoro at Nihon U.  <negoro@phys.cst.nihon-u.ac.jp>",
  "email": "negoro@phys.cst.nihon-u.ac.jp",
  "body": "M. Fujita, H. Negoro (Nihon U.), M. Serino (RIKEN), S. Nakahira, \nS. Ueno, H. Tomida,  M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA)\nT. Mihara, M. Sugizaki, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN),\nN. Kawai, T. Yoshii, Y. Tachibana, Y. Ono (Tokyo Tech),\nA. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU),\nH. Tsunemi, R. Imatani (Osaka U.),\nM. Nakajima, F. Honda, T. Namba, T. Masumitsu, K. Tanaka (Nihon U.),\nY. Ueda, T. Kawamuro, T. Hori (Kyoto U.),\nY. Tsuboi, S. Kanetou (Chuo U.),\nM. Yamauchi, D. Itoh (Miyazaki U.),\nK. Yamaoka (Nagoya U.),\nM. Morii (ISM)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 00:21:12 UT.\n\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(326.501 deg, -28.137 deg) = (21 46 00, -28 08 12) (J2000)\n(326.260 deg, -28.014 deg) = (21 45 02, -28 00 49) (J2000)\n(326.513 deg, -27.682 deg) = (21 46 03, -27 40 55) (J2000)\n(326.753 deg, -27.805 deg) = (21 47 00, -27 48 19) (J2000)\n\nThe position of GRB 150430A (D'Elia et al. GCN #17789) is inside\nof the error box. The trigger time is 16 sec before the BAT trigger.\nThe data download was, however, delayed for about 8.8 hours \nprobably because of the data tracking problem.\n\nThe X-ray flux averaged over the scan was 512 +- 45 mCrab\n(4-10keV, 1 sigma error). A simple power-law fit to the GSC 2-20 keV\nspectrum gives a power-law index of 1.08  +/- 0.20.\n\nThere was no significant excess flux in the previous transit at 4/29 22:48 UT,\nand in the next transit at 4/30 03:26 UT with an upper limit of 20 mCrab for each."
}