[vsnet-grb-info 15489] GRB 140903A: MAXI/GSC upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16778
SUBJECT: GRB 140903A: MAXI/GSC upper limit
DATE:    14/09/05 03:31:00 GMT
FROM:    Motoko Suzuki at RIKEN  <motoko at crab.riken.jp>

M. Serino (RIKEN), T. Sakamoto (AGU), N. Kawai (Tokyo Tech), 
S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA),
T. Mihara, M. Sugizaki, M. Morii, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN),
T. Yoshii, Y. Tachibana (Tokyo Tech),
A. Yoshida,  Y. Kawakubo, H. Ohtsuki (AGU),
H. Tsunemi, D. Uchida (Osaka U.),
H. Negoro, M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, M. Fujita, F. Honda (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 scanned the field of GRB 140903A 
triggered by Swift BAT (Cumming et al. GCN Circ. 16763) 
at 15:00:42 (12 sec after the trigger) UT on 2014-09-03.  
The durations of the scan was 44 sec.  
No obvious source was detected by MAXI/GSC at the location of BAT.  
The 3 sigma upper limit of the scan derived by the MAXI/GSC data is 
8.4 x 10^-10 erg/cm2/s (4-10 keV).  
This upper limit is roughly consistent with the power-law 
interpolation of the BAT prompt emission flux (T ~ 0-0.3 s) and 
the first XRT point (t ~ 100 s), assuming that the BAT spectrum 
(power-law with photon index 1.99, Palmer et al. GCN Circ. 16768) 
extends down to soft X-ray emission with  no spectral break.
It suggests that no strong soft extended emission was associated 
with this GRB (Sakamoto et al. GCN Circ. 16771).