MAXI/GSC detection of an onset of X-ray outburst from X-ray binary pulsar GS1843-02
ATel #8392; M. Nakajima, H. Negoro (Nihon U.), T. Mihara, M. Serino (RIKEN), R. Sasaki (Chuo U.), A. Tanimoto (Kyoto U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), M. Sugizaki, 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, Y. Nakamura (Chuo U.), M. Yamauchi, D. Itoh, K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM) report on behalf of the MAXI team:
on 10 Dec 2015; 01:29 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar
On 2015 December 8.12 (MJD 57364.12), the MAXI/GSC nova alert system detected an X-ray flux enhancement from a position of (R.A., Dec) = (282.5, -2.0). At almost the same time, the Swift/BAT observed a X-ray brightening from GS1843-02 (GCN#18675). Since there are no transient reports around the MAXI/GSC position except for GS1843-02, the event triggered by the MAXI/GSC would be GS1843-02. The MAXI/GSC data of 1 day bin showed that the source flux in 4-10 keV band is 18 +- 6 mCrab on MJD 57364. The 15-50 keV flux reached 58 +- 11 mCrab on MJD 57364. According to the orbital parameters (Porb=242.18 d, T0=49616.48(MJD) ; Finger et al. 1999), the orbital phase of the onset of X-ray brightening is ~0.99, which is consistent with the previous outburst ones observed in 2015 April (Atel#7386). Thus the current activity is a normal one synchronized with its orbital period.
The latest light curve and the image are available at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J1848-024
