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MAXI/GSC discovery of a new hard X-ray transient MAXI J1535-571

ATel #10699; H. Negoro (Nihon U.), M. Ishikawa, S. Ueno, H. Tomida, Y. Sugawara, N. Isobe, R. Shimomukai (JAXA), T. Mihara, M. Sugizaki, M. Serino, S. Nakahira W. Iwakiri, M. Shidatsu, M. Matsuoka (RIKEN), N. Kawai, S. Sugita, T. Yoshii, Y. Tachibana, S. Harita, Y. Muraki, K. Morita (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka, T. Hashimoto (AGU), H. Tsunemi, T. Yoneyama (Osaka U.), M. Nakajima, T. Kawase, A. Sakamaki (Nihon U.), Y. Ueda, T. Hori, A. Tanimoto, S. Oda (Kyoto U.), Y. Tsuboi, Y. Nakamura, R. Sasaki, H. Kawai (Chuo U.), M. Yamauchi, C. Hanyu, K, Hidaka (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.)
on 3 Sep 2017; 01:08 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)

Subjects: X-ray, Black Hole, Neutron Star, Transient

Referred to by ATel #: 10700, 10702, 10708, 10711, 10714, 10716, 10734, 10745, 10761, 10768

The MAXI/GSC nova alert system triggered a bright uncatalogued hard X-ray transient source at 23:55 UT on 2017 September 02. Assuming that the source flux was constant over the transits from UT 10:03 to 23:56 on 2017 September 2, we obtain the source position at
(R.A., Dec) = (233.794 deg, -57.179 deg) = (15 35 10, -57 10 43) (J2000)
with a 90% C.L. statistical error of 0.34 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan transits was 34 +- 6 mCrab (4.0-10.0keV, 1 sigma error).

The X-ray flux has been increased since the beginning of September 2.
We encourage followup observations of this source.

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