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MAXI/GSC observation of an X-ray outburst from Be/X-ray binary pulsar 4U 1036-56 (RX J1037.5-5647, SWIFT J1037.6-5648, 3MAXI J1036-568)

ATel #16669; 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 (Kyoto U.), M. Yamauchi, Y. Otsuki, T. Hasegawa, M. Nishio (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (NAOC), W. Iwakiri (Chiba U.)
on 25 Jun 2024; 01:22 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)

Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar

The MAXI/GSC nova alert system triggered a faint X-ray transient source on 2024-06-19. Assuming that the source fluxes were constant over the 16 scans between 2024-06-19T00:42 and 2024-06-20T00:01, we obtain the source position at (R.A., Dec) = (159.257 deg, -56.998 deg) = (10 37 01, -56 59 52) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.55 deg and 0.46 deg, respectively. The roll angle of long axis from the north direction is 64.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). This position is consistent with the Be/X-ray binary pulsar 4U 1036-56 (RX J1037.5-5647, SWIFT J1037.6-5648, 3MAXI J1036-568). The 2-day averaged flux in 4-10 keV became maximum with the peak flux of 0.014 ± 0.004 photon/cm2/sec (11 ± 3 mCrab) on 2024-06-17 (MJD 60478), and faded to 0.004 ± 0.003 photon/cm2/sec (3 mCrab) on 2024-06-21 (MJD 60482). The latest flux is under the detection limit of the MAXI/GSC. The 61-day period shaped like the step function was confirmed.

The previous activities were reported by Swift and INTEGRAL observations in 2012 (ATel#3936), 2015(ATel#8425,#8435), and 2017(ATel#10486). The MAXI light curve in 2009 - 2016 is in the Fig.8 ( #78 3MAXI J1036-568 ) in the MAXI 7-year catalog (Hori et al. ApJ. Suppl. 235:7, 2018) with flux of 0.4 mCrab. The orbital-averaged MAXI 15-year light curve is at http://maxi.riken.jp/plot/4u1036_r61.jpg .