MAXI/GSC detection of an X-ray outburst from the Be/X-ray binary pulsar 2S 1553-542 (H 1553-542)

ATel #16835; M. Nakajima, H. Negoro (Nihon U.), T. Mihara (RIKEN), Y. Kudo, H. Shibui, K. Takagi, H. Takahashi, K. Tatano, H. Nishio (Nihon U.), T. Kawamuro, S. Yamada, S. Wang, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, H. Nishikawa, Y. Kondo, A. Yoshida (AGU), Y. Tsuboi, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.), I. Takahashi, M. Niwano, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, M. Kurihara (JAXA), Y. Ueda, Y. Okada, K. Fujiwara (Kyoto U.), M. Yamauchi, Y. Otsuki, T. Hasegawa, M. Nishio (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.), W. Iwakiri (Chiba U.)
on 30 Sep 2024; 13:33 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)

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The MAXI/GSC nova-alert system detected the onset of an X-ray outburst from the Be/X-ray binary pulsar 2S 1553-542 on 2024-09-06 (MJD 60559). This is the third X-ray outburst from this source in the past 10 years, after the ones in 2015 (ATel#7018) and in 2021 (ATel#14301, #14308, #14335, #14348). The MAXI/GSC monitor data indicated that the current activity began around 2024-09-02 (MJD 60555). In the last week, the 4-10 keV flux remained at a constant level of ∼0.014 photons/s/cm² (∼12 mCrab). Compared to the previous two events observed in 2015 and 2021, the current outburst follows a similar profile during its ascent phase. Therefore, it is expected that the current outburst will also last for ∼100 days. The current outburst is also detected by Fermi/GBM. We encourage multi-wavelength observations to investigate this event.

The latest source light curves can be checked at the following pages;
MAXI ( http://maxi.riken.jp/v7l3h/J1557-544/index.html ),
Swift/BAT ( https://swift.gsfc.nasa.gov/results/transients/weak/H1553-542/ ),
Fermi/GBM ( https://gammaray.msfc.nasa.gov/gbm/science/pulsars/lightcurves/2s1553.html ), and
the BeXRB monitor page ( https://integral.esac.esa.int/bexrbmonitor/webpage_oneplot.php ).