TITLE:   GCN CIRCULAR
NUMBER:  38897
SUBJECT: GRB 250107D: CALET Gamma-Ray Burst Monitor detection
DATE:    25/01/10 17:22:49 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

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

The short GRB 250107D (IPN triangulation: Kozyrev et al., GCN Circ. 38880;
Konus-Wind detection: Frederiks et al., GCN Circ. 38881) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 05:23:36.72 UTC on 7 January 2025
(https://cgbm.calet.jp/cgbm_trigger/flight/1420262534/index.html).
The burst signal was seen by only the SGM detector.  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 pulse that starts
at T+0.17 sec, peaks at T+0.25 sec, and ends at T+0.32 sec.
The T90 and T50 durations measured by the SGM data are 0.13 +/- 0.03 sec
and 0.08 +/- 0.02 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1420262534/

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