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MAXI/GSC detects a new X-ray transient MAXI J0556-332

ATel #3102; T. Matsumura (Chuo U.), H. Negoro, F. Suwa (Nihon U.), S. Nakahira (AGU), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, Y. E. Nakagawa, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), N. Kawai, M. Morii, K. Sugimori, R. Usui (Tokyo Tech), A. Yoshida, K. Yamaoka (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), M. Nakajima, H. Ozawa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi, M. Shidatsu (Kyoto U.), A. Daikyuji (Miyazaki U.), Y. Tsuboi, Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team
on 12 Jan 2011; 03:21 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)

Subjects: X-ray, Binary, Nova, Star, Transient

Referred to by ATel #: 3103, 3104, 3110, 3112, 3116, 3119, 3327, 3328, 3349, 3650, 4524, 8513, 8517

At 2011-01-11 09:21 UT (= MJD 55572.3896), the MAXI/GSC transient alert system triggered and localted an X-ray transient at:

(R.A., Dec) = (+89.06 deg, -33.21 deg) = (05 56 14, -33 12 36) (J2000)

with a systematic uncertainty of 0.2 deg. There is no known bright X-ray source in the error circle.

With examination of older data we find that the X-ray flux was present since 2011-01-11 05:09. There are no data for the source between 2011-01-10 19:38 and 2011-01-11 05:09. On the scan transit at 2011-01-10 19:38, there was a faint X-ray source at this position, but with low significance.

The source showed variability between the scans, and the 4-10 keV flux at the brightest epoch was about 80 mCrab at 2011-01-11 09:44.

Swift/XRT follow-up observation is being carried out (PI=J. Kennea), and a more accurate position will be given. Further follow-up observations are strongly encouraged.