MAXI/GSC detection of a new X-ray transient MAXI J1910-057/Swift J1910.2-0546

ATel #4140; R. Usui (Tokyo Tech), S. Nakahira, H. Tomida (JAXA), H. Negoro (Nihon U.), M. Morii , N. Kawai, K. Ishikawa (Tokyo Tech), S. Ueno, M. Ishikawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, T. Yamamoto, M. Matsuoka (RIKEN), A. Yoshida (AGU), H. Tsunemi, M. Kimura (Osaka U.), M. Nakajima, M. Asada, H. Sakakibara, N. Serita (Nihon U.), Y. Ueda, K. Hiroi, M. Shidatsu, R. Sato (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.) M. Yamauchi, Y. Nishimura, T. Hanayama, K. Yoshidome (Miyazaki U.), K. Yamaoka (Waseda U.)
on 1 Jun 2012; 05:44 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nobuyuki Kawai (nkawai@phys.titech.ac.jp)

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At 2012/05/31 22:36:28 UT (MJD=56078.941991), the MAXI/GSC alert system triggered a new X-ray transient source near 4U 1916-053 (MAXI event ID= 6078777285, reported as the MAXI New-transient E-mail alert No.55, http://maxi.riken.jp/alert/novae/6078777285/6078777285.htm ).

The refined source position is:

(R.A., Dec) = (287.516, -5.819) = (19 10 04, -05 49 07) (J2000)

with a statistical uncertainty of 0.25 deg at the 90% confidence limit and an additional systematic uncertainty of 0.1 deg (90% containment radius). The source position is consistent with the new transient source reported by Krimm et al. with Swift (ATel #4139).

Recent MAXI data show that the source flux has gradually increased since the beginning of 31 May 2012. The average fluxes on 31 May 2012 are 45+-7 mCrab (2-4 keV), 38+-7 mCrab (4-10 keV), and 68+-28 mCrab (10-20 keV).

The latest light curves and images of MAXI J1910-057 by MAXI/GSC are placed at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J1910-057