TITLE: GCN CIRCULAR NUMBER: 35697 SUBJECT: GRB 240205B: CALET Gamma-Ray Burst Monitor detection DATE: 24/02/07 01:32:14 GMT FROM: Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu> T. Sakamoto, A. Yoshida, S. Sugita (AGU), Y. Kawakubo (LSU), 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 240205B (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 35682; Swift detection: Moss et al., GCN Circ. 35683; INTEGRAL SPI-ACS Trigger #10513; GECAM detection: Zhang et al., GCN Circ. 35689; Fermi GBM Observation: Fletcher et al., GCN Circ. 35693) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 22:13:45.98 UTC on 5 February 2024 (http://cgbm.calet.jp/cgbm_trigger/flight/1391206207/). The burst signal was seen by only the SGM detector. Based on the GRB position reported by Swift-BAT (referenced to GCN Circ. 35683), the angle from the SGM bore-sight is 106 degrees, and the direction was blocked by the structures of the International Space Station. Although the observed light curve was affected by the structures, SGM detected the brightest peak which was observed by Fermi-GBM, INTEGRAL SPI-ACS, and GECAM. The burst light curve shows a single pulse that starts at T+0.0 sec, peaks at T+0.4 sec, and ends at T+0.9 sec. The T90 and T50 durations measured by the SGM data are 0.7 +/- 0.3 sec and 0.2 +/- 0.1 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1391206207/index.html The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University. View this GCN Circular online at https://gcn.nasa.gov/circulars/35697. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...