GCN Circular 35582
Subject
GRB 240117A: CALET Gamma-Ray Burst Monitor detection
Date
2024-01-19T18:53:39Z (a year ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
Via
Web form
M. L. Cherry (LSU) 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),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 240117A (Glowbug gamma-ray detection: Cheung
et al., GCN Circ 35569; AstroSat CZTI detection: Joshi et al., GCN
Circ 35574) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 19:52:31.44 UTC on 17 January 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1389556167/).
The burst signal was seen by only the SGM detector.
The burst light curve shows a single pulse that starts at T+2.4 sec,
peaks at T+4.5 sec, and ends at T+8.8 sec. The T90 and T50 durations
measured by the SGM data are 5.7 +/- 0.6 sec and 2.6 +/- 0.3 sec
(40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1389556167/index.html
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.