MAXI/GSC detection of a new X-ray transient MAXI J0051-736 toward the Small Magellanic Cloud
ATel #8088; H. Negoro (Nihon U.), T. Kawamuro (Kyoto U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R. Imatani (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Hori (Kyoto U.), Y. Tsuboi, S. Kanetou (Chuo U.), M. Yamauchi, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM)
on 24 Sep 2015; 01:37 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Black Hole, Neutron Star, Transient
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 14:54 on 2015 September 23. Using data obtained in scan transits from 20:23 on 2015 September 22 UT to 22:37 on September 23 UT, we obtain the source position at
(R.A., Dec) = (12.982 deg, -73.668 deg) = (00 51 55, -73 40 04) (J2000)
with a 90% C.L. statistical error of 0.25 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). The position lies 0.35 arc-deg from RX J0052-7319, and is marginally consistent with RX J0052-7319 if the systematic uncertainty is taken into account. The Swift/BAT data (http://swift.gsfc.nasa.gov/results/transients/weak/RXJ0052.1-7319/), however, do not show any flux increase. Thus, we tentatively name the source MAXI J0051-736.
The X-ray flux averaged over the scan transits was 16 +- 4 mCrab (4-10keV, 1 sigma error). The 4-10 keV flux has rapidly increased since the beginning of September 23, reaching about 40-50 mCrab at the end of September 23.
We encourage followup observations with multi-wavelengths to reveal the nature of the source. The latest light curves and other information will be placed at:
http://maxi.riken.jp/top/index.php?cid=1&jname=J0051-736
Detection information on MAXI J0051-736
