{
  "submittedHow": "web",
  "createdOn": 1761667701345,
  "circularId": 42505,
  "body": "Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, \nK. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),\nN. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 251028B (Fermi GBM Final Localization Correction: Fermi GBM team,\nGCN Circ. 42502) triggered the CALET Gamma-ray Burst Monitor (CGBM) at \n07:48:06.24 UTC on 28 October 2025\n(https://cgbm.calet.jp/cgbm_trigger/flight/1445672396/index.html).\nThe burst signal was seen by all CGBM detectors. \n\nThe burst light curve shows a multi-peaked structure that starts\nat T-0.5 sec, peaks at T+9.9 sec, and ends at T+11.5 sec.\nThe T90 and T50 durations measured by the SGM data are 11.3 +/- 0.4 sec\nand 8.5 +/- 0.3 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1445672396/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "format": "text/plain",
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
  "eventId": "GRB 251028B",
  "subject": "GRB 251028B: CALET Gamma-Ray Burst Monitor detection",
  "bibcode": "2025GCN.42505....1A"
}