{
  "bibcode": "2023GCN.33322....1A",
  "body": "Y. Asaoka (ICRR), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nY. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),\nS. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 230204B (MAXI/GSC Detection: Serino et al., GCN Circ. 33265;\nSwift/BAT-GUANO detection: Kennea et al., GCN Circ. 33267; AstroSat CZTI\ndetection: Waratkar et al., GCN Circ. 33268; AGILE detection: Casentini et al.,\nGCN Circ. 33272; Detection by GRBAlpha: Dafcikova et al., GCN Circ. 33273;\nFermi-GBM Detection: Poolakkil et al., GCN Circ. 33288) triggered\nthe CALET Gamma-ray Burst Monitor (CGBM) at 21:44:25.20 UTC \non February 4, 2023\n(http://cgbm.calet.jp/cgbm_trigger/flight/1359582171/index.html).\nThe burst signal was seen by only the SGM detector.\n\nThe burst light curve shows a double-peaked structure that starts\nat T+2.3 sec, peaks at T+54.1 sec and ends at T+65.0 sec.\nThe T90 and T50 durations measured by the SGM data are 59.5 +/- 0.9 sec\nand 11.6 +/- 0.8 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1359582171/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "circularId": 33322,
  "createdOn": 1676355519000,
  "email": "kawakubo1@lsu.edu",
  "subject": "GRB 230204B: CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>",
  "eventId": "GRB 230204B"
}