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GCN Circular 10914

Subject
XRF 100701A : MAXI/GSC detection of a probable XRF
Date
2010-07-01T11:39:28Z (14 years ago)
From
Motoko Suzuki at RIKEN <motoko@crab.riken.jp>
M. Suzuki(RIKEN), H. Negoro(Nihon U.), 
K. Kawasaki, S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA),
T. Mihara, Y.E. Nakagawa, M. Sugizaki, T. Yamamoto, 
T. Sootome, M. Matsuoka (RIKEN), N. Kawai, M. Morii, K. Sugimori (Tokyo Tech),
A. Yoshida, K. Yamaoka,  S. Nakahira (AGU),
H. Tsunemi, M. Kimura (Osaka U.), M. Nakajima
H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, 
S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), A. Uzawa, 
T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team:

At the scan transit centered at UT 2010-07-01T06:54:28,
MAXI/GSC detected a short X-ray transient lasting about 30 seconds 
within the 50 seconds triangular transit response of MAXI/GSC.
Judging from its location and spectral hardness ratio, this transient is
probably an X-ray flash.

Since the emission was detected only for a fraction of the triangular 
transit response, the uncertainty of its position along the scan direction 
is large.  Without assuming the source constancy, we obtain a rectangular 
error box (90%C.L.) centered at

(R.A., Dec) = (+188.86 deg, -34.26 deg) = (12 35 26, -34 15 39)(J2000)

and with the following corners: 

(R.A., Dec) = (+188.58 deg, -35.24 deg) = (12 34 20, +35 14 36)(J2000)
(R.A., Dec) = (+188.18 deg, -35.14 deg) = (12 32 42, +35 08 19)(J2000)
(R.A., Dec) = (+189.15 deg, -33.28 deg) = (12 36 35, +33 16 45)(J2000)
(R.A., Dec) = (+189.54 deg, -33.39 deg) = (12 38 11, +33 23 30)(J2000)

There is additional systematic uncertainty of 0.2 deg (90% containment radius).

The preliminary flux (4-10 keV) of the source was at least 200 mCrab.
There was no significant detection at the transit location in the
previous and following orbits (92 min before or after the detection) 
with an upper limit of 20 mCrab.  There is no known bright X-ray source 
at the detected position. 

Follow-up observations are encouraged.
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