{
  "bibcode": "2016GCN.19415....1N",
  "body": "H. Negoro (Nihon U.), S. Nakahira (JAXA),  T. Mihara (RIKEN),\nS. Ueno, H. Tomida, M. Ishikawa, Y. E. Nakagawa, Y. Sugawara (JAXA), \nM. Sugizaki, M. Serino, W. Iwakiri, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), \nN. Kawai, N. Isobe, S. Sugita, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), \nA. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka (AGU), \nH. Tsunemi, R.Imatani (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu, \nT. Kawase (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori, A. Tanimoto (Kyoto U.), \nY. Tsuboi, Y. Nakamura, R. Sasaki (Chuo U.), M. Yamauchi, K. Furuya (Miyazaki U.),  \nK. Yamaoka (Nagoya U.) report on behalf of the MAXI team:\n\nWe reexamined the localization of GRB 160509A (Longo et al. GCN 19403; \nOno et al. GCN 19404,19405) only using the GSC camera 7 (Bcam1), and\nnot using an uncalibrated GSC camera 0 (Acam0) which was also used in \nthe previous analysis (GCN 19404, 19405).\n\nWe obtain the source position for a constant flux source at\n(R.A., Dec) = (311.521 deg, 76.057 deg) = (20 46 05, +76 03 24) (J2000)\nwith a 90% C.L. statistical error of 0.12 deg and an additional systematic \nuncertainty of 0.1 deg (90% containment radius),\nand a rectangular error box for a variable flux source with the following corners:\n(R.A., Dec) = (310.806 deg, 76.105 deg) = (20 43 13, +76 06 16) (J2000)\n(R.A., Dec) = (311.249 deg, 75.892 deg) = (20 44 59, +75 53 32) (J2000)\n(R.A., Dec) = (312.671 deg, 76.056 deg) = (20 50 41, +76 03 21) (J2000)\n(R.A., Dec) = (312.242 deg, 76.270 deg) = (20 48 57, +76 16 13) (J2000)\n\nThe Swift/XRT source position (Kennea et al. GCN 19408; Levan et al. GCN 19410;  \nAlexander et al. GCN 19414) is 0.076 arc-degree from the refined best position, \nand also within the rectangular region.\n\nA GSC spectrum is roughly represented by an absorbed power-law \nwith a photon spectral index of 1.26 +/- 0.16, and the resultant 2-10 keV flux \nis 2.78e-08 ergs/cm^2/s. The absorption column is fixed to 4.6 x 10^21 cm^-2 \nin the fit (Kennea et al. GCN 19408).\n\nWe also note that there was no significant excess flux in the next transit at \n10:37 UT on 2016 May 9 with an upper limit of 20 mCrab.\n~",
  "circularId": 19415,
  "createdOn": 1462853612000,
  "email": "negoro@phys.cst.nihon-u.ac.jp",
  "subject": "GRB 160509A: MAXI/GSC refined analysis",
  "submitter": "H. Negoro at Nihon U.  <negoro@phys.cst.nihon-u.ac.jp>",
  "eventId": "GRB 160509A"
}