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GCN Circular 35165

Subject
GRB 231122B: CALET Gamma-Ray Burst Monitor detection
Date
2023-11-23T03:58:18Z (3 months ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
Via
Web form
Y. Asaoka (ICRR), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
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 231122B (GECAM detection: Wang et al., GCN
Circ. 35157; Glowbug gamma-ray detection: Cheung et al., GCN
Circ. 35161; Swift/BAT-GUANO detection: Ronchini et al., GCN
Circ. 35164) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 15:12:38.15 UTC on 22 November 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1384701074/).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a multi-peaked structure that starts
at T+2.5 sec, peaks at T+3.3 sec, and ends at T+41.7 sec.
The T90 and T50 durations measured by the SGM data are 34.0 +/- 1.0 sec
and 22.6 +/- 1.3 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1384701074/index.html

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