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Short X-ray Transient detected by MAXI/GSC

ATEL # 2524; H. Tomida, M. Matsuoka, K. Kawasaki, S. Ueno, M. Suzuki, M. Ishikawa (JAXA), M. Morii, K. Sugimori, N. Kawai (Tokyo Tech), T. Mihara, M.Kohama, M. Sugizaki, Y.E. Nakagawa, T. Yamamoto, T. Saotome (RIKEN), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), H. Negoro, M. Nakajima, S. Miyoshi, H. Ozawa, R. Ishiwata (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.), on behalf of the MAXI team
on 30 Mar 2010; 12:16 UT
Password Certification: Hiroshi Tomida (tomida.hiroshi@jaxa.jp)

Subjects: X-ray, Transients

At the scan transit centered at UT 2010-03-27T17:08:15, MAXI/GSC detected a transient X-ray source. Assuming constant flux over the transit, the source location is determined as

(R.A., Dec) = (346.03 deg, 42.90 deg) = (23 04 07, 42 54 00) (J2000)

we obtain a rectangular error box with the following corners:

(R.A., Dec) = (+346.11 deg, +43.42 deg) = (23 04 25, +43 25 25)(J2000)
(R.A., Dec) = (+345.53 deg, +43.21 deg) = (23 02 06, +43 12 48)(J2000)
(R.A., Dec) = (+346.10 deg, +42.34 deg) = (23 04 24, +42 20 27)(J2000)
(R.A., Dec) = (+346.68 deg, +42.54 deg) = (23 06 44, +42 32 26)(J2000)

The preliminary flux (4-10keV) of the source is 110 mCrab. The source was not detected in 10-20keV band. There was no significant detection at the transit location in the previous and following orbits (92min before and after the detection) with an upper limit of 20mCrab. There is no known bright source at the detected position.

Note: Since the nature of the source is unknown, this message is cross-posted to ATel and GCN.


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R. E. Rutledge , Editor
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