[vsnet-grb-info 25796] GRB 200530A: CALET Gamma-Ray Burst Monitor detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27896
SUBJECT: GRB 200530A: CALET Gamma-Ray Burst Monitor detection
DATE:    20/06/06 12:01:09 GMT
FROM:    Valentin Pal'shin at AGU  <val at phys.aoyama.ac.jp>

S. Sugita, A. Yoshida, T. Sakamoto, V. Pal'shin (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka, S. Torii (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 200530A (Fermi GBM Localization: the Fermi GBM team,
GCN Circ. 27861; AstroSat CZTI detection: Gupta et al., GCN Circ. 27864;
Fermi-LAT detection: Longo et al., GCN Circ. 27891;
https://gcn.gsfc.nasa.gov/other/200530A.gcn3) triggered the CALET
Gamma-ray Burst Monitor (CGBM) at 00:44:15.067 UTC on 30 May 2020.
The burst signal was seen by all CGBM detectors.
Because of a problem in one of the ground alert processing script, the GCN
notice was not distributed automatically for this event.

The burst light curve shows a multi-peaked structure which starts at
T-2.9 sec, peaks at T+5.6 sec and ends at T+21.1 sec. The T90 and T50
durations measured by the SGM data are 19.7 +- 2.0 sec and 9.5 +- 0.9 sec
(40-1000 keV), respectively.

The ground processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1274834660/

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