{
  "circularId": 44242,
  "subject": "GRB 260407A: CALET Gamma-Ray Burst Monitor detection",
  "eventId": "GRB 260407A",
  "body": "M. L. Cherry (LSU), 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),\nN. Cannady (GSFC), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 260407A (Fermi GBM Final Real-time Localization: Fermi GBM team,\nGCN Circ. 44226; Glowbug gamma-ray detection: Cheung et al., GCN Circ 44237)\ntriggered the CALET Gamma-ray Burst Monitor (CGBM) at 09:11:06.11 UTC on 7 April 2026\n(https://cgbm.calet.jp/cgbm_trigger/flight/1459588274/index.html).\nThe burst signal was seen by all CGBM detectors.  \n\nThe burst light curve shows a single pulse that starts\nat T-0.5 sec, peaks at T+1.6 sec, and ends at T+27.1 sec.\nThe T90 and T50 durations measured by the SGM data are 22.6 +/- 5.0 sec\nand 7.0 +/- 1.0 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1459588274\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "createdOn": 1775706224284,
  "submittedHow": "web",
  "bibcode": "2026GCN.44242....1C",
  "format": "text/plain",
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>"
}