GCN Circular 33501
Subject
GRB 230320B: CALET Gamma-Ray Burst Monitor detection
Date
2023-03-22T04:03:08Z (a year ago)
From
Yuta Kawakubo at Louisiana State U./CALET <kawakubo1@lsu.edu>
T. Tamura (Kanagawa U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),
Y. Shimizu (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 230320B (AstroSat CZTI detection: Navaneeth
et al., GCN Circ 33492) triggered the CALET Gamma-ray Burst
Monitor (CGBM) at 21:12:22.70 UTC on 20 March 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1363381768/index.html).
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+3.5 sec, and ends at T+20.3 sec.
The T90 and T50 durations measured by the SGM data are 16.5 +/- 4.0 sec
and 5.0 +/- 1.0 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1363381768/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.