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GCN Circular 35136

Subject
GRB 231117A: CALET Gamma-Ray Burst Monitor detection
Date
2023-11-20T14:39:59Z (5 months ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
Via
Web form
K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), 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 231117A (Swift detection: Laha et al., GCN Circ. 35071;
AstroSat CZTI detection: Navaneeth et al.,  GCN Circ. 35072; AGILE 
detection: Cattaneo et al., GCN Circ. 35075; Konus-Wind detection: 
Svinkin et al., GCN Circ. 35079; Glowbug gamma-ray detection: 
Cheung et al., GCN Circ. 35081; AGILE/MCAL analysis: Casentini 
et al., GCN Circ. 35085; GRBAlpha detection: Dafcikova et al., GCN
Circ. 35095; GECAM-C detection: Wang-Chen et al., GCN Circ. 35117)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 03:03:19.31
UTC on 17 November 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1384225326/).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse that starts
at T+0.35 sec, peaks at T+0.68 sec, and ends at T+1.02 sec.
The T90 and T50 durations measured by the SGM data are 0.45 
+/- 0.08 sec and 0.15 +/- 0.02 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1384225326/

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