MAXI/GSC detects a new outburst from the black hole candidate H 1743-322

ATel #4419; M. Shidatsu (Kyoto U.), H. Negoro (Nihon U.), S. Nakahira (JAXA), T. Mihara (RIKEN), S. Ueno, H. Tomida, M. Ishikawa (JAXA), M. Sugizaki, M. Serino, T. Yamamoto, J. Sugimoto, M. Matsuoka (RIKEN), N. Kawai, M. Morii, R. Usui, K. Ishikawa (Tokyo Tech), A. Yoshida (AGU), H. Tsunemi, M. Kimura (Osaka U.), M. Nakajima, M. Asada, H. Sakakibara, N. Serita (Nihon U.), Y. Ueda, K. Hiroi, R. Sato, T. Kawamuro (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.), M. Yamauchi, Y. Nishimura, T. Hanayama, K. Yoshidome (Miyazaki U.), K. Yamaoka (Waseda U.) report on behalf of the MAXI team
on 25 Sep 2012; 02:28 UT
Credential Certification: Megumi Shidatsu (shidatsu@kusastro.kyoto-u.ac.jp)

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We report on an increase of X-ray flux from the black hole candidate H 1743-322 detected with MAXI/GSC. The MAXI/GSC nova alert system triggered on the flux enhancement on 2012 September 24 11:28 (UT) at 20+-7 mCrab in the 2-20 keV range. INTEGRAL/ISGRI also detected the source as reported by ATel #4418 (Grinberg et al. 2012), and Swift/BAT hard X-ray monitor shows an increase of hard X-rays. These results indicate that the source is now entering into a new outburst. The source shows a gradual increase of the time intervals between outbursts. The intervals between 2-20 keV flux peaks are 218-221, 249, 253, >267 days in the last 4 outbursts. The latest light curve and the image of this source are available at the following URL: http://maxi.riken.jp/top/index.php?cid=1&jname=J1746-322 . Note that H1743-322 is located near the galactic center and that the flux in the light curve is contaminated with the galactic ridge X-ray emission. Multi-wavelength observations of this initial stage of the outburst are encouraged.