TITLE:   GCN CIRCULAR
NUMBER:  34804
SUBJECT: GRB 231004A: CALET Gamma-Ray Burst Monitor detection
DATE:    23/10/05 18:15:41 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto,
S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),
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), P. S. Marrocchesi (U of Siena),
and the CALET collaboration:

The long GRB 231004A (Fermi GBM Final Real-time Localization: Fermi GBM team,
GCN Circ. 34795) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 08:23:32.70 UTC on 4 October 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1380443018/).
The burst signal was seen by only the SGM detector.

The burst light curve shows a multi-peaked structure that starts
at T+2.1 sec, peaks at T+2.9 sec, and ends at T+4.1 sec.
The T90 and T50 durations measured by the SGM data are 1.7 +/- 0.2 sec
and 1.1 +/- 0.3 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1380443018/index.html

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