MAXI/GSC detection of X-ray outburst from Be/X-ray binary pulsar H1145-619
ATel #8007; M. Nakajima (Nihon U.), T. Mihara (RIKEN), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), 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.), H. Negoro, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, S. Kanetou (Chuo U.), M. Yamauchi, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM)
on 5 Sep 2015; 21:48 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar
Referred to by ATel #: 15366
MAXI/GSC has detected an X-ray brightening from the position (RA,DEC) = (177,-62). The day-averaged lightcurve in the 2-20 keV band shows the flux increase have started from 2015 August 30 (MJD 57264), and it reached 0.183 +- 0.018 ph/s/cm2 (51 +- 5 mCrab) on September 3 (MJD 57268). At the X-ray enhancement position, there are two pulsars, 1E 1145.1-6141 (= 3A 1145-616, V830 Cen) and H 1145-619 (= 4U 1145-619, V801 Cen), separated by 15.6 arcmin. The former source shows rather persistent X-ray emission of about 15 mCrab in the 2-20 keV band, while the latter one (a Be X-ray binary) exhibits the periodic X-ray outburst synchronized with its orbital period of 186.5 day (Warwick et al. 1985). The time interval between the onset of the current event and that of the previous brightening of H 1145-619 (Atel#7215) is ~184 day. Thus the present event would be a normal X-ray outburst of H 1145-619. The Swift/BAT monitor data also detected the outburst from H 1145-619. On September 4 (MJD 56269), the day-averaged 15-50 keV flux have increased to 0.0080 +- 0.0016 ct/s/cm2 (36 +- 7 mCrab) which is comparable to the peak flux of the normal outburst observed in 2015 May (Atel#7215).
We encouraged multi wavelength observations. The latest light curve and the image are available at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J1148-622
