TITLE:   GCN CIRCULAR
NUMBER:  25452
SUBJECT: Fermi GBM-190816: Coverage and upper limits from MAXI/GSC observations
DATE:    19/08/23 01:54:12 GMT
FROM:    Motoko Serino at RIKEN/MAXI  <motoko@crab.riken.jp>

N. Kawai, M. Sugizaki (Tokyo Tech), H. Negoro (Nihon U.), 
S. Sugita, M. Serino (AGU),
Y. Kawakubo (LSU), 
M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.),
T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN),
T. Sakamoto, H. Nishida, A. Yoshida (AGU),
Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.),
M. Shidatsu (Ehime U.), M. Oeda, K. Shiraishi (Tokyo Tech),
S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, N. Isobe, R. Shimomukai, M. Tominaga (JAXA),
Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.),
H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.),
M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.),
T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.) 
report on behalf of the MAXI team:

We examined MAXI/GSC all-sky X-ray images (2-20 keV) 
after Fermi GBM-190816 at 2019-08-16 21:22:14.563 UTC (GCN 25406).

At the trigger time of Fermi GBM-190816, the high-voltage of MAXI/GSC was on,
but the FOV was out of the 90% credible region of GBM-190816-with-LV-v1 skymap.
The first one-orbit (92 min) scan observation with GSC after the event covered 86% 
of the 90% credible region of the skymap from 21:27:25 to 22:54:10 UTC (T0+312 to T0+5517 sec).

No significant new source was found in the region in the one-orbit scan observation.
A typical 1-sigma averaged upper limit obtained in one scan observation
is 20 mCrab at 2-20 keV.

If you require information about X-ray flux by MAXI/GSC at specific coordinates,
please contact the submitter of this circular by email.