MAXI/GSC detection of a new outburst from 4U 1630-472

ATel #6991; T. Takagi, M. Serino (RIKEN), S. Nakahira (JAXA), M. Shidatsu (Kyoto U.), S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Morii, J. Sugimoto, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), H. Negoro (Nihon U.), M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, M. Fujita, F. Honda (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 26 Jan 2015; 11:16 UT
Credential Certification: Satoshi NAKAHIRA (nakahira@crab.riken.jp)

Tweet

The MAXI/GSC nova alert system triggered an X-ray transient at 2015 January 25 20:25UT. We obtained the source position at
(R.A., Dec) = (248.254 deg, -47.561 deg) = (16 33 00, -47 33 39) (J2000)
with a position uncertainty of ~0.31 deg. This position is consistent with that of the black hole candidate 4U 1630-472. The X-ray flux has increased since January 25, and averaged 2-10 keV flux from January 25 through 26.3 is 90±12 mCrab.

X-ray outbursts from 4U1630-472 were also detected in 2009 December (#2363) and 2011 December (#3830). Since the end of the previous outburst in 2013 December, no obvious X-ray source has been detected in this region until 2015 January 24, meanwhile.
Follow-up observations are encouraged.

The latest source flux can be checked at the following page;
http://maxi.riken.jp/top/index.php?cid=1&jname=J1634-473