MAXI/GSC detects X-ray re-brightening of MAXI J1409-619

ATel #3067; S. Ueno (JAXA), M. Sugizaki (RIKEN), H. Negoro (Nihon U.), N. Kawai (Tokyo Tech), H. Tomida, M. Kohama, M. Ishikawa (JAXA), T. Mihara, Y. E. Nakagawa, M. Serino, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), M. Morii, K. Sugimori, R. Usui (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, M. Shidatsu (Kyoto U.), A. Daikyuji (Miyazaki U.), Y. Tsuboi, A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team
on 5 Dec 2010; 09:37 UT
Credential Certification: Shiro Ueno (ueno.shiro@jaxa.jp)

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We report a re-brightening of MAXI J1409-619, which is a galactic transient source discovered by MAXI/GSC in Oct 2010 (Yamaoka et al, ATEL #2959). Following the discovery, Swift/XRT succeeded in the accurate localization (Kennea et al, ATEL #2962) and the detection of an ~500s period (Kennea et al, ATEL #3060). We show the flux change measured by MAXI/GSC in the following table.

  
Center of      Time-averaged  Energy   Spacecraft  
One-day Bin    Flux           Band     Instrument  
[UT]           [mCrab]        [keV]     
   
2010-11-25.5   11 +/- 4       4-10     MAXI/GSC  
2010-11-26.5   18 +/- 4       4-10     MAXI/GSC  
2010-11-27.5   10 +/- 4       4-10     MAXI/GSC  
2010-11-28.5   19 +/- 4       4-10     MAXI/GSC  
2010-11-30.5   24 +/- 6       4-10     MAXI/GSC  
2010-12-01.5   44 +/- 5       4-10     MAXI/GSC  
2010-12-02.5   37 +/- 5       4-10     MAXI/GSC  
2010-12-03.5   48 +/- 5       4-10     MAXI/GSC  

We have also compiled recent X-ray fluxes of MAXI J1409-619, which are taken from other telegrams. Both Swift/XRT (ATEL #2962) and RXTE/PCA (ATEL #2969) revealed significant X-ray variability of this source on time scales of hundreds of seconds. To make comparison easy between the first and the next tables, we use the time average of flux. The next table lists time-averaged fluxes over 1ks for Swift/XRT's first observation, a net exposure of 7.5ks for RXTE/PCA's three observations, and 2ks for Swift/XRT's second observation.

The two tables show that the current flux level of MAXI J1409-619 is the highest since its discovery. Follow-up observations of this brightening phase are encouraged. The MAXI/GSC continues to monitor this source. The light curve is available at http://maxi.riken.jp/

  
Date of         Time-average         Energy   Spacecraft  Comment  
Observation     Flux                 Band     Instrument  
[UT]                                 [keV]     
  
2010-10-17      41+/-7 mCrab         4-10     MAXI/GSC    Ref 1  
2010-10-18      29+/-7 mCrab         4-10     MAXI/GSC    Ref 1                  
2010-10-20      1.3E-10 erg/s/cm-2   0.3-10   Swift/XRT   Ref 2  
2010-10-22(1st) 1.12E-10 erg/s/cm-2  2-10     RXTE/PCA    Ref 3;~5mCrab  
2010-10-22(2nd) 1.18E-10 erg/s/cm-2  2-10     RXTE/PCA    Ref 3;~5mCrab  
2010-10-23(3rd) 1.28E-10 erg/s/cm-2  2-10     RXTE/PCA    Ref 3;~5mCrab  
2010-11-30      7E-10 erg/s/cm-2     0.3-10   Swift/XRT   Ref 4  
  
Ref 1: Yamaoka et al, ATEL #2959  
Ref 2: Kennea et al, ATEL #2962  
Ref 3: Yamaoka et al, ATEL #2969  
Ref 4: Kennea et al, ATEL #3060