TITLE:   GCN CIRCULAR
NUMBER:  27661
SUBJECT: SGR 1935+2154: MAXI/GSC detection
DATE:    20/04/28 04:09:00 GMT
FROM:    Satoshi Nakahira at RIKEN  <nakahira@crab.riken.jp>

Y. Sugawara, S. Nakahira (JAXA), H. Negoro, M. Nakajima (Nihon U.), M. Serino (AGU),
M. Aoki, K. Kobayashi, R. Takagi, K, Asakura, K, Seino, S. Mokumoto (Nihon U.),
T. Mihara, C. Guo, Y. Zhou, T. Tamagawa, M. Matsuoka (RIKEN),
T. Sakamoto, S. Sugita, H. Nishida, A. Yoshida (AGU),
Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.),
M. Shidatsu (Ehime U.),
N. Kawai, R. Adachi, M. Niwano (Tokyo Tech),
S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA),
Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.),
H. Tsunemi (Osaka U.),
M. Yamauchi, K. Kurogi, K. Miike (Miyazaki U.),
T. Kawamuro (NAOJ),
K. Yamaoka (Nagoya U.),
Y. Kawakubo (LSU),
M. Sugizaki (NAOC)
report on behalf of the MAXI team:

The MAXI/GSC nova alert system triggered on two bright short bursts from the position consistent with that of an active Soft Gamma Repeater SGR 1935+2154 (GCN #27657, #27659, Atel #13675).

Showing a double-peaked profile, the first one started at 20:01:45.99 of 2020-04-27 UT with a total duration of ~100 ms.
The 5ms peak flux was about 75 Crab in the 2-20 keV band for each pulse.
The second burst started at 21:56:02.63 UT with a single-peaked structure with a duration of 50 ms. This peak flux was about 40 Crab in 5 ms.