MAXI/GSC detection of a new X-ray outburst from 1A 1744-361
ATel #15407; K. Kobayashi, H. Negoro, M. Nakajima, M. Tanaka, Y. Soejima (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, J. Kohara (Chuo U.), M. Shidatsu, M. Iwasaki (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka, T. Kurihara (JAXA), Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC)
on 31 May 2022; 15:16 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Neutron Star, Transient
The MAXI/GSC nova alert system triggered on a faint X-ray enhancement at 14:51 UT on 2022 May 30. The source flux has been gradually increasing since May 29. Assuming that the source flux was constant over eight transits from 14:51 on May 30 to 09:26 on May 31, we obtain the source position at
(R.A., Dec) = (266.916 deg, -36.299 deg) = (17 47 39, -36 17 56) (J2000)
with a statistical 90% C.L. elliptical error region with long and short radii of 0.29 deg and 0.23 deg, respectively. The roll angle of the long axis from the north direction is 159.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scans was 43 +- 7 mCrab (4.0-10.0keV, 1 sigma error).
The error region includes the low-mass X-ray binary 1A 1744-361. The previous outburst from 1A 1744-361 was reported in August 2013 (Bahramian et al. ATel #5301). The Swift/BAT light curve of 1A 1744-361, however, does not show significant activity (https://swift.gsfc.nasa.gov/results/transients/weak/1A1744-361/). We therefore tentatively name the source MAXI J1747-362.
Followup observations are encouraged to identify this source.
Trigger information about 1A 1744-361/MAXI J1747-362
