GCN Circular 36798
Subject
GRB 240627A: CALET Gamma-Ray Burst Monitor detection
Event
Date
2024-07-01T05:00:32Z (a year ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
K. Kobayashi (Waseda U) A. Yoshida, T. Sakamoto, S. Sugita,
Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, Y. Akaike (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 240627A (AstroSat CZTI detection: Joshi et al., GCN Circ. 36776;
NuSTAR Detection: Grefenstette et al., GCN Circ. 36778) was detected in the ground
analysis of the CALET Gamma-ray Burst Monitor (CGBM) data around 23:59:01.50 on
27 June 2024 (referenced to the AstroSat detection: GCN Circ. 36776).
(https://cgbm.calet.jp/cgbm_trigger/flight/1403567463/index.html)
The burst signal was seen by only the SGM detector.
The burst light curve shows a multi-peaked structure that starts
at T-7.5 sec and ends at T+8.0 sec.
The T90 and T50 durations measured by the SGM data are 12.1 +/- 0.5 sec
and 4.6 +/- 0.2 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1403567463/index.html
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.