{
  "createdOn": 1772182516960,
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
  "bibcode": "2026GCN.43860....1K",
  "subject": "GRB 260226A: CALET Gamma-Ray Burst Monitor detection",
  "format": "text/plain",
  "submittedHow": "web",
  "body": "K. Kobayashi (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita, \nY. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, 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 260226A (Fermi GBM Final Real-time Localization: Fermi\nGBM team, GCN Circ. 43840; BALROG localization: Preis et al., GCN Circ\n43843; Fermi-LAT detection: Depalo et al., GCN Circ 43844; AstroSat CZTI\ndetection: Harsha et al., GCN Circ 43846; Fermi-LAT refined analysis: Depalo\net al., GCN Circ 43850; Fermi GBM observation: Bissaldi et al., GCN Circ 43851;\nNuSTAR detection: Waratkar et al., GCN Circ 43854; Glowbug gamma-ray detection:\nWoolf et al., GCN Circ 43855) triggered the CALET Gamma-ray Burst Monitor (CGBM)\nat 10:38:04.46 UTC on 26 February 2026\n(https://cgbm.calet.jp/cgbm_trigger/flight/1456137494/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-3.9 sec, peaks at T+11.1 sec, and ends at T+37.0 sec.\nThe T90 and T50 durations measured by the SGM data are 16.0 +/- 0.3 sec\nand 8.2 +/- 0.1 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1456137494/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "eventId": "GRB 260226A",
  "circularId": 43860
}