MAXI/GSC detection of a possible new transient MAXI J1752-457
ATel #16898; M. Serino (AGU), H. Negoro (Nihon U.), W. Iwakiri (Chiba U.), M. Nakajima, Y. Kudo, 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, S. Sugita, Y. Kawakubo, H. Hiramatsu, H. Nishikawa, Y. Kondo, S. Sasao, 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.), on behalf of the MAXI team
on 10 Nov 2024; 10:24 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
Subjects: X-ray, Transient
The MAXI/GSC detected a bright uncatalogued X-ray transient source at 18:23 on November 9 2024 UT. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (268.213 deg, -45.795 deg) = (17 52 51, -45 47 42) (J2000) with a 90% C.L. statistical error of 0.04 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). The transient was detected in two consecutive scan transits at 18:23 and 19:56 UT. The X-ray fluxes averaged over each scan were 982 +- 50 mCrab and 396 +- 34 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 16:50 UT and in the next transit at 21:29 UT with an upper limit of 20 mCrab for each.
Since there are no known bright X-ray sources near the source position, we tentatively name the source MAXI J1752-457. We encourage multi-wavelength observations to investigate this event.
