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MAXI/GSC observations of Swift J1843.5-0343

ATel #3114; T. Mihara, M. Sugizaki (RIKEN), H. Negoro (Nihon U.), Y. E. Nakagawa, M. Serino, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), H. Tomida, S. Ueno, M. Kohama, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori, R. Usui, T. Toizumi (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), M. Nakajima H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), Y. Tsuboi, T. Matsumura, A. Uzawa, K. Yamazaki, (Chuo U.), report on behalf of the MAXI team
on 19 Jan 2011; 13:38 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Mutsumi Sugizaki (sugizaki@riken.jp)

Subjects: X-ray, Transient, Variables

We analyzed MAXI/GSC data including the new Galactic transient, Swift J1843.5-0343 (ATEL #3109), taken by the all-sky observation. The source whose position is consistent with that of Swift J1843.5-0343, had been detected since 2011 Jan. 8 (UT) (MJD 55569) with the significance above 4 sigma in the 4-10 keV band. The light curve shows the flux gradually increased prior to the MAXI detection and remained at around 30 mCrab since Jan. 9. It could not be observed due to the sun-angle limit on Jan. 14 and Jan. 15 including the day on which Swift/BAT detected a rapid brightening (ATEL #3109). The obtained fluxes were

 
Date (UT)  flux and 1-sigma error in 4-10 keV band 
Jan. 8     21 +- 4.8 mCrab 
Jan. 9     29 +- 4.5 
Jan. 10    22 +- 4.3 
Jan. 11    33 +- 6.0 
Jan. 12    18 +- 7.8 
Jan. 13    40 +- 12 
 
Jan. 16    56 +- 32 
Jan. 17    29 +- 7.4 
These values include the contribution of unresolved Galactic X-ray emission whose level is about 8 mCrab and stable.
The latest MAXI/GSC light curve and image of the source are available at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J1843-037