TITLE:   GCN CIRCULAR
NUMBER:  38295
SUBJECT: GRB 241120A: CALET Gamma-Ray Burst Monitor detection 
DATE:    24/11/22 06:14:13 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

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

The long GRB 241120A (Fermi GBM Final Real-time Localization: Fermi GBM
team, GCN Circ. 38279; a long GRB detected by INTEGRAL: Gotz et al.,
GCN Circ. 38280; Fermi GBM Observation, Hamburg et al., GCN Circ. 38285)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 05:54:00.493 UTC
on 20 November 2024
(https://cgbm.calet.jp/cgbm_trigger/flight/1416117245/index.html).

The burst signal was seen by all CGBM detectors.  Because of a problem with
the ground alert processing script, the GCN notice was not distributed
automatically for this event.

The burst light curve shows a single emission episode that starts
at T-3.0 sec, peaks at T+0.1 sec, and ends at T+0.8 sec.
The T90 and T50 durations measured by the SGM data are 2.9 ± 0.5 sec
and 0.8 ± 0.3 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1416117245/

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