TITLE:   GCN CIRCULAR
NUMBER:  44283
SUBJECT: GRB 260410A: CALET Gamma-Ray Burst Monitor detection
DATE:    26/04/13 08:51:45 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

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

The CALET Gamma-ray Burst Monitor (CGBM) detected GRB 260410A 
(Fermi GBM Final Real-time Localization: Fermi GBM team, GCN #44252; 
Fermi-LAT detection: Holzmann Airasca et al., GCN #44253; Fermi GBM 
Observation: Hamburg et al., GCN #44258) at 07:03:56.88 UTC on 10 April 2026
(https://cgbm.calet.jp/cgbm_trigger/flight/1459839839/index.html).
The burst signal was seen by all CGBM detectors.  

The burst light curve shows a short pulse starting
at T+0.06 s, peaking at T+0.18 s, and ending at T+0.29 s.
The T90 and T50 durations measured with the SGM data are 0.21 +/- 0.04 s
and 0.10 +/- 0.03 s (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1459839839/

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