TITLE: GCN CIRCULAR NUMBER: 10492 SUBJECT: XRF 100315A: MAXI/GSC detection of a short X-ray transient DATE: 10/03/16 09:25:55 GMT FROM: Motoko Suzuki at JAXA M. Kohama, M. Suzuki (JAXA), H. Negoro, M. Nakajima (Nihon U.), M. Matsuoka, K. Kawasaki, S. Ueno, H. Tomida, M. Ishikawa (JAXA), M. Morii, K. Sugimori, N. Kawai (Tokyo Tech), T. Mihara, M. Sugizaki, Y.E. Nakagawa, T. Yamamoto, T. Saotome (RIKEN), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), 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, Yamazaki (Chuo U.), on behalf of the MAXI team At the scan transit centered at UT 2010-03-15T17:13:40, MAXI/GSC detected a short X-ray transient with two spikes lasting about 25 seconds within the 83 seconds triangular transit response of MAXI/GSC. The source location is determined as (R.A., Dec)=( 74.95 deg, -6.63 deg) = ( 4 59 48, -6 37 48) (J2000) we obtain a rectangular error box with the following corners: (R.A., Dec) = (+73.50 deg, -6.42 deg) = (04 54 1, -06 25 29)(J2000) (R.A., Dec) = (+73.66 deg, -7.19 deg) = (04 54 38, -07 11 19)(J2000) (R.A., Dec) = (+76.40 deg, -6.80 deg) = (05 05 36, -06 48 16)(J2000) (R.A., Dec) = (+76.30 deg, -6.03 deg) = (05 05 12, -06 01 54)(J2000) The preliminary flux (4-10 keV) of the source was more than 250 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.