TITLE:   GCN CIRCULAR
NUMBER:  33948
SUBJECT: GRB 230608A: CALET Gamma-Ray Burst Monitor detection
DATE:    23/06/10 04:09:51 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, 
S. Sugita (AGU), Y. Kawakubo (LSU), 
S. Nakahira (JAXA), Y. Asaoka (ICRR),
S. Torii, Y. Akaike, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:

The long GRB 230608A (INTEGRAL SPI ACS Trigger #10282;
AGILE detection: Longo et al., GCN Circ 33946; AstroSat CZTI
detection: Navaneeth et al., GCN Circ 33947) triggered the 
CALET Gamma-ray Burst Monitor (CGBM)  at 18:34:33.392 UTC 
on 8 June 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1370284460/index.html).
The burst signal was seen by only the SGM detector.

The burst light curve shows a single pulse that starts
at T+2.5 sec, peaks at T+3.3 sec, and ends at T+7.0 sec.
The T90 and T50 durations measured by the SGM data are 
3.9 +/- 0.4 sec and 1.6 +/- 0.4 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1370284460/

The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.