TITLE:   GCN CIRCULAR
NUMBER:  42252
SUBJECT: GRB 251013A: CALET Gamma-Ray Burst Monitor detection
DATE:    25/10/14 11:06:25 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

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

The GRB 251013A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 42213;
SVOM/GRM observation: Wang et al., GCN Circ. 42218) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 08:04:04.90 UTC on 13 October 2025
(https://cgbm.calet.jp/cgbm_trigger/flight/1444377382/index.html).
The burst signal was seen by only the SGM detector. 

The burst light curve shows a single pulse that starts
at T+0.55 sec, peaks at T+1.32 sec, and ends at T+1.85 sec.
The T90 and T50 durations measured by the SGM data are 1.20 +/- 0.16 sec
and 0.50 +/- 0.11 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1444377382/

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