MAXI/GSC detection of a new X-ray outburst from the HMXB IGR J01054-7253 or a new X-ray transient MAXI J0105-727
ATel #16598; H. Negoro, Y. Kudo, M. Nakajima, H. Shibui, K. Takagi, H. Takahashi, K. Tatano, H. Nishio (Nihon U.), T. Mihara, 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, E. Goto, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.), I. Takahashi, M. Niwano, S. Sato, 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), and W. Iwakiri (Chiba U.)
on 25 Apr 2024; 11:19 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Transient
The MAXI/GSC nova alert system triggered on an uncatalogued X-ray transient source in a Small Magellanic Cloud region at 01:34 UT on 2024 April 25. Assuming that the source flux was constant over the transits from 05:28 on April 24 to 06:13 April 25, we obtain the source position at
(R.A., Dec) = (16.328 deg, -72.761 deg) = (01 05 18, -72 45 39) (J2000)
with a statistical 90% C.L. elliptical error region with long and short radii of 0.51 deg and 0.41 deg, respectively. The roll angle of the long axis from the north direction is 97.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The 4-10 keV X-ray flux averaged over the scans were about 30 mCrab or less.
The error region contains the high-mass X-ray binary J01054-7253 (Bozzo et al. ATel #2079), and marginally RX J0101.8-7223/SXP 175 (Haberl and M. Sasaki, 2000, A&A, 359, 573, also Townsend et al. ATel #3311). We also tentatively name the source MAXI J0105-727.
Followup observations are encouraged.
Trigger Information
