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GCN Circular 36764

Subject
GRB 240624B: CALET Gamma-Ray Burst Monitor detection
Date
2024-06-26T03:29:21Z (17 days ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, 
Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, 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 240624B (Fermi GBM Final Real-time Localization: Fermi 
GBM team, GCN Circ. 36749; GRBAlpha detection: Dafcikova et al., GCN
Circ. 36759) triggered the CALET Gamma-ray Burst Monitor (CGBM) 
at 19:19:42.90 UTC on 24 June 2024 
(https://cgbm.calet.jp/cgbm_trigger/flight/1403291510/).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a main pulse around the trigger time, with
weak pulses starting around T + 50 sec.  The burst emission starts 
at T+2.4 sec, peaks at T+3.4 sec, and ends at T+100.4 sec. The 
T90 and T50 durations  measured by the SGM data are 93.6 +/- 1.8 sec 
and 69.4 +/- 11.7 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

https://cgbm.calet.jp/cgbm_trigger/ground/1403291510/index.html

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