TITLE:   GCN CIRCULAR
NUMBER:  33763
SUBJECT: GRB 230510B: CALET Gamma-Ray Burst Monitor detection
DATE:    23/05/11 06:22:32 GMT
FROM:    Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>

P. S. Marrocchesi (U of Siena), 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),
and the CALET collaboration:

The long GRB 230510B (Fermi GBM Final Real-time Localization: Fermi GBM team,
GCN Circ. 33759; MAXI/GSC detection: Nakajima et al., GCN Circ 33760) triggered
the CALET Gamma-ray Burst Monitor (CGBM) at 21:21:32.08 UTC on 10 May 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1367788853/index.html).
The burst signal was seen by all CGBM detectors.

The burst light curve shows a double-peaked structure that starts
at T-45.5 sec, peaks at T+23.4 sec, and ends at T+263.9 sec.
The T90 and T50 durations measured by the SGM data are 233.0 +/- 3.3 sec
and 168.5 +/- 0.8 sec (40-1000 keV), respectively.

The ground-processed light curve is available at

http://cgbm.calet.jp/cgbm_trigger/ground/1367788853/

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