{
  "bibcode": "2025GCN.42402....1N",
  "submittedHow": "web",
  "format": "text/plain",
  "eventId": "GRB 251023B",
  "circularId": 42402,
  "createdOn": 1761236162772,
  "subject": "GRB 251023B: CALET Gamma-Ray Burst Monitor detection",
  "body": "S. Nakahira (JAXA), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU),\nK. Yamaoka (Nagoya U), Y. Asaoka (ICRR), S. Torii, Y. Akaike, \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 251023B (MAXI/GSC Detection: Kang et al., GCN Circ \n42392) was detected in the ground analysis of the CALET Gamma-ray \nBurst Monitor (CGBM) data around 08:49:03 on 23 October 2025 (referenced\nto the MAXI detection: GCN Circ. 42392).\n(https://cgbm.calet.jp/cgbm_trigger/flight/1445244062/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-31.7 sec and ends at T+8.2 sec.\nThe T90 and T50 durations measured by the HXM2 data are 34.9 +/- 4.2 sec\nand 16.7 +/- 2.2 sec (7-100 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1445244062/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>"
}