[vsnet-grb-info 16008] GRB 150110A: MAXI/GSC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17290
SUBJECT: GRB 150110A: MAXI/GSC detection
DATE:    15/01/10 16:05:28 GMT
FROM:    H. Negoro at Nihon U.  <negoro at phys.cst.nihon-u.ac.jp>

H. Negoro (Nihon U.), S. Nakahira,  S. Ueno, H. Tomida, M. Kimura, 
M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, 
M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), 
N. Kawai, Y. Tachibana, T. Yoshii (Tokyo Tech), A. Yoshida, T. Sakamoto, 
Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), 
M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, M. Fujita, F. Honda, 
T. Namba (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), 
Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.),
 K. Yamaoka (Nagoya U.) report on behalf of the MAXI team:

The MAXI/GSC detected a bright uncatalogued hard X-ray transient source 
around UT 2015-01-10T10:23.37.

Unfortunately, after MAXI detected the burst for about 10 sec, no data were 
obtained (or downloaded yet) for 27 seconds. 
As a result, we can not determine the X-ray flux and the source position 
correctly. 
Using the data, we obtain a rectangular error box for the transient source 
with the following corners:

(R.A., Dec) = (215.959 deg, 18.705 deg) = (14 23 50, +18 42 18) (J2000)
(R.A., Dec) = (215.630 deg, 19.420 deg) = (14 22 31, +19 25 10) (J2000)
(R.A., Dec) = (218.120 deg, 20.331 deg) = (14 32 28, +20 19 52) (J2000)
(R.A., Dec) = (218.422 deg, 19.605 deg) = (14 33 41, +19 36 18) (J2000)

There is an additional systematic uncertainty of 0.1 deg (90% containment radius).

The 4-10 keV flux is roughly about 200 mCrab.
We also note that Fermi-GBM also detected this burst almost simultaneously.

There was no significant excess flux in the previous transit at UT 08:50,
and in the next transit at UT 11:56 with an upper limit of 20 mCrab for each.

Detection Information:
http://maxi.riken.jp/alert/novae/7032899999/7032899999.htm