Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 35176

GRB 231124A: CALET Gamma-Ray Burst Monitor detection
2023-11-24T14:01:20Z (8 months ago)
Yuta Kawakubo at Louisiana State University <>
Web form
S. Torii (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), 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 231124A (Fermi GBM Final Real-time Localization: 
Fermi GBM team, GCN Circ. 35174) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 08:38:12.68 UTC on 24 November 2023
The burst signal was seen by all CGBM detectors.

The burst light curve shows a multi-peaked structure that starts
at T-0.2 sec, peaks at T+10.9 sec, and ends at T+17.9 sec.
The T90 and T50 durations measured by the SGM data are 
16.7 +/- 1.0 sec and 7.1 +/- 1.1 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.
Looking for U.S. government information and services? Visit