TITLE:   GCN CIRCULAR
NUMBER:  35200
SUBJECT: GRB 231127A: CALET Gamma-Ray Burst Monitor detection
DATE:    23/11/27 15:08:54 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

GRB 231127A: CALET Gamma-Ray Burst Monitor detection

K. Kobayashi (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, Y. Akaike (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 231127A (AstroSat CZTI detection: Navaneeth et al.,
GCN Circ 35197) triggered the CALET Gamma-ray Burst Monitor 
(CGBM) at 05:14:16.39 UTC on 27 November 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1385097164/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse that starts
at T+2.9 sec, peaks at T+5.4 sec, and ends at T+8.1 sec.
The T90 and T50 durations measured by the SGM data are 
4.0 +/- 0.4 sec and 1.4 +/- 0.1 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1385097164/

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