TITLE:   GCN CIRCULAR
NUMBER:  33448
SUBJECT: GRB 230307A: MAXI/GSC upper limit
DATE:    23/03/10 04:03:34 GMT
FROM:    Motoko Serino at Aoyama Gakuin U.  <serino@phys.aoyama.ac.jp>

S. Sugita, M. Serino (AGU), H. Negoro (Nihon U.), T. Mihara (RIKEN),
M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima (Nihon U.),
T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN),
T. Sakamoto, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),
Y. Tsuboi, J. Kohara, S. Urabe, S. Nawa, N. Nemoto (Chuo U.),
M. Shidatsu, M. Iwasaki (Ehime U.),
N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech),
S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, T. Kurihara (JAXA),
Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba, Y. Nakatani (Kyoto U.),
M. Yamauchi, T. Sato, R. Hatsuda, R. Fukuoka, Y. Hagiwara, Y. Umeki (Miyazaki U.),
K. Yamaoka (Nagoya U.),
Y. Kawakubo (LSU),
M. Sugizaki (NAOC) ,
W. Iwakiri (Chiba U.) 
report on behalf of the MAXI team:

We report the non-detection of MAXI/GSC of GRB 230307A 
(Fermi-GBM GCN #33405, #33407 #33411; GECAM GCN #33406, 
Solar Orbiter STIX GCN #33410; AGILE/MCAL GCN #33412;
HEND/Mars Odyssey, INTEGRAL SPI-ACS, Swift/BAT GCN #33413;
AstroSat CZTI GCN #33415; GRBAlpha GCN #33418; 
VZLUSAT-2 GCN #33424; Konus-Wind GCN #33427;
AstroSat LAXPC GCN #33437; ASO-S/HXI GCN #33438;
).
At 15:58:54 UT on 2023-03-07 (888s after the Fermi/GBM trigger),
MAXI/GSC scanned the error region of the event.
The scan time of the five consecutive scans were
17:31:49 (t0+6463s), 19:04:40 (t0+12034s), 20:37:36 (t0+17610s),
22:10:27 (t0+23181s), and 23:43:22 (t0+28756s).
No significant excess emission was detected from the region. 
Typical 1-sigma upper limits in 2-20 keV for one scan (and six scans) are
20 mCrab (and 8 mCrab).