GCN Circular 35623
Subject
GRB 240122B: CALET Gamma-Ray Burst Monitor detection
Date
2024-01-24T20:04:13Z (3 months ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
Via
Web form
S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto,
S. Sugita (AGU), Y. Kawakubo (LSU), 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),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 240122B (Glowbug gamma-ray detection:
Cheung et al., GCN Circ. 35606) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 19:16:26.96 UTC
on 22 January 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1389985993/).
The burst signal was seen by HXM2 and SGM.
The burst light curve shows a double-peaked structure that starts
at T-57.2 sec, peaks at T+9.0 sec, and ends at T+17.1 sec.
The T90 and T50 durations measured by the SGM data are
69.2 +/- 1.9 sec and 32.2 +/- 19.7 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1389985993/index.html
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.