GCN Circular 39040
Subject
GRB 250126A: CALET Gamma-Ray Burst Monitor detection
Event
Date
2025-01-26T15:05:47Z (9 months ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
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 long GRB 250126A (Fermi GBM Final Real-time Localization:
Fermi GBM team, GCN Circ. 39035; BALROG localization: Preis et al.,
GCN Circ 39036; MAXI/GSC detection: Okada et al., GCN Circ 39038)
was detected in the ground analysis of the CALET Gamma-ray
Burst Monitor (CGBM) data around 04:58:50.99 on 26 January 2025 (referenced
to the Fermi-GBM Observation: GCN Circ. 39035).
(https://cgbm.calet.jp/cgbm_trigger/flight/1421902612/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a multi-peaked structure that starts
at T-0.3 sec, peaks at T+85.4 sec, and ends at T+100.1 sec.
The T90 and T50 durations measured by the HXM2 data are 96.9 +/- 1.4 sec
and 82.5 +/- 1.3 sec (7-100 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1421902612/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.