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XTE J1752-223: Flux increasing in a new RXTE and Swift X-ray transient in the Galactic center region

ATEL # 2259; S.Nakahira (Aoyama u.), H.Negoro (Nihon u.), K.Yamaoka (Aoyama u.), M.Matsuoka (JAXA), Y.Ueda (Kyoto u.), H.Tomida (JAXA), M.Sugizaki (Riken), M.Nakajima (Nihon u.), N.Kawai (Tokyo Tech.), A.Yoshida (Aoyama u.), T.Mihara (Riken) and the MAXI team.
on 25 Oct 2009; 17:23 UT
Password Certification: Tatehiro Mihara (mihara@crab.riken.jp)

Subjects: X-ray, Request for Observations, Binaries, Black Holes, Neutron Stars, Transients
Referred to by ATEL #: 2263, 2268, 2269

MAXI/GSC detected increasing X-ray intensity of XTE J1752-223, the new source of RXTE and Swift X-ray transient in the Galactic center region (ATEL #2258). The X-ray flux in the energy band of 2 - 20 keV is increasing as less than 10 mCrab in the period of 4:20 - 13:30, 23 Oct, 2009; 30 mCrab at 15:05, 23 Oct; 15 mCrab in 18:10 - 21:10, 23 Oct; 30 mCrab in 22:40, 23 Oct - 6:20, 24 Oct; 40 mCrab in 7:50 - 14:00, 24 Oct; 50 mCrab in 15:30 - 21:30, 24 Oct; 60 mCrab in 23:00, 24 Oct - 2:10, 25 Oct; 110 mCrab at 3:40, 25 Oct; 55 mCrab in 5:10 - 9:45, 25 Oct; with an uncertainty of +- 10 mCrab (1-sigma) for each scan in the period. The GSC of MAXI (Matsuoka et al. PASJ 61(2009), 999) is performing the test operation in the commission phase. It scans XTEJ1752-223 intermittently in every 90 minutes. Further follow-up observations are going on.


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R. E. Rutledge , Editor
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