Skip to main content
New Swift-BAT/GUANO and IceCube Notice Types Available! See news and announcements

GCN Circular 35198

GRB 231125A: CALET Gamma-Ray Burst Monitor detection
2023-11-27T12:41:07Z (3 months ago)
Yuta Kawakubo at Louisiana State University <>
Web form
Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU), 
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, 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 GRB 231125A (AstroSat CZTI detection: Waratkar et al.,  
GCN Circ 35190; Glowbug gamma-ray detection: Cheung et al.,
GCN Circ 35196) triggered the CALET Gamma-ray Burst Monitor 
(CGBM) at 17:47:20.53 UTC on 25 November 2023
The burst signal was seen by all CGBM detectors.  No real-time 
CGBM GCN notice was distributed about this trigger because
the real-time communication from the ISS was off (loss of signal).

The burst light curve shows a single pulse that starts
at T-0.19 sec, peaks at T+0.41 sec, and ends at T+1.60 sec.
The T90 and T50 durations measured by the SGM data are 
1.17 +/- 0.13 sec and 0.40 +/- 0.04 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