GCN Circular 38569
Subject
GRB 241209D: CALET Gamma-Ray Burst Monitor detection
Date
2024-12-14T09:21:25Z (20 days ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU),
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),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 241209D (Fermi GBM Final Real-time Localization:
Fermi GBM team, GCN Circ 38488; Swift detection of a burst:
Parsotan et al., GCN Circ 38489; Fermi GBM Observation: Malacaria
et al., GCN Circ 38507; AstroSat CZTI detection: Tembhurnikar et al.,
GCN Circ 38518; Konus-Wind detection: Ridnaia et al., GCN Circ
38526) triggered the CALET Gamma-ray Burst Monitor (CGBM) at
10:59:46.760 UTC on 9 December 2024
(https://cgbm.calet.jp/cgbm_trigger/flight/1417777157/index.html).
The burst signal was seen by only the SGM detector. Because of a
problem with the ground alert processing script, the GCN notice was
not distributed automatically for this event.
The burst light curve shows a single pulse that starts at T-4.0 sec,
peaks at T+0.6 sec, and ends at T+6.7 sec. The T90 and T50 durations
measured by the SGM data are 9.2 +/- 0.7 sec and 4.6 +/- 0.4
sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1417777157/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.