[vsnet-grb-info 28014] GRB 210602A: CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30117
SUBJECT: GRB 210602A: CALET Gamma-Ray Burst Monitor detection
DATE:    21/06/03 07:04:45 GMT
FROM:    Valentin Pal'shin at AGU  <val at phys.aoyama.ac.jp>

V. Pal'shin, 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, 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 bright GRB 210602A (MAXI/GSC detection: Serino et al., GCN Circ. 30113)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 12:04:01.493 UTC
on 2 June 2021
(http://cgbm.calet.jp/cgbm_trigger/flight/1306670489/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a single pulse which starts at T+0.5 sec,
peaks at T+1.4 sec, and ends at T+3.0 sec. The T90 and T50 durations
measured by the SGM data are 1.9 +- 0.3 sec and 0.5 +- 0.1 sec (40-1000
keV), respectively.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1306670489/

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