GCN Circular 39663
Subject
GRB 250308A: CALET Gamma-Ray Burst Monitor detection
Date
2025-03-11T09:19:04Z (3 days ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
Y. Kawakubo, A. Yoshida, T. Sakamoto, S. Sugita (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 250308A (SVOM/GRM observation: the SVOM team, GCN
Circ. 39632, 39636; IPN triangulation: Kozyrev et al., GCN Circ. 39653)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 18:06:30.72
UTC on 8 March 2025
(https://cgbm.calet.jp/cgbm_trigger/flight/1425492335/index.html).
The burst signal was seen by SGM and HXM2.
The burst light curve shows a single pulse that starts
at T-0.1 sec, peaks at T+0.1 sec, and ends at T+0.3 sec.
The T90 and T50 durations measured by the SGM data are 0.4 +/- 0.2 sec
and 0.2 +/- 0.1 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1425492335/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.