{
  "body": "N. Cannady (GSFC/UMBC), A. Yoshida, T. Sakamoto, S. Sugita,\nY. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), \nY. Shimizu, T. Tamura (Kanagawa U), M. L. Cherry (LSU),\nS. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 250902B (Fermi GBM Final Real-time Localization: \nFermi GBM team, GCN Circ. 41660; SVOM/GRM observation: Wang et al.,\nGCN Circ. 41668; AstroSat CZTI detection: Tembhurnikar et al., GCN Circ. 41678) \ntriggered the CALET Gamma-ray Burst Monitor (CGBM) at 18:45:35.15 UTC on 2 September 2025\n(https://cgbm.calet.jp/cgbm_trigger/flight/1440873547/index.html).\nThe burst signal was seen by all CGBM detectors.  Because of a problem with the ground \nalert processing script, the GCN notice was not distributed automatically for this event.\n\nThe burst light curve shows a multi-peaked structure that starts\nat T-2.4 sec, peaks at T+9.6 sec, and ends at T+17.4 sec.\nThe T90 and T50 durations measured by the SGM data are 17.4 +/- 0.7 sec\nand 8.8 +/- 0.6 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1440873547/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "eventId": "GRB 250902B",
  "createdOn": 1757009058638,
  "bibcode": "2025GCN.41707....1C",
  "circularId": 41707,
  "subject": "GRB 250902B: CALET Gamma-Ray Burst Monitor detection",
  "submittedHow": "web",
  "format": "text/plain",
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>"
}