{
  "submitter": "Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>",
  "format": "text/plain",
  "eventId": "GRB 260601B",
  "body": "S. Sugita, A. Yoshida, T. Sakamoto, Y. Kawakubo (AGU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii,\nY. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),\nN. Cannady (GSFC), M. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe CALET Gamma-ray Burst Monitor (CGBM) detected GRB 260601B\nat 19:12:46.66 UTC on 1 June 2026 (trigger #1464376270;\nhttps://cgbm.calet.jp/cgbm_trigger/flight/1464376270/index.html).\nA CGBM Notice was distributed in near real time.\n\nThis event was also reported by GECAM-B (Yu et al., GCN #44767;\nWang et al., GCN #44768) and NuSTAR (Waratkar et al., GCN #44771).\n\nThe burst signal was seen by all CGBM detectors.\nThe burst light curve shows a multi-peaked structure starting\nat T+0.1 s, peaking at T+4.9 s, and ending at T+101.4 s.\nThe T90 and T50 durations measured with the SGM data are 70.0 +/- 4.7 s\nand 21.9 +/- 1.0 s in the 40-1000 keV band, respectively.\n\nEinstein Probe/WXT detected an X-ray transient, EP 260601a\n(Yang et al., GCN #44766), about 35 s after the CGBM trigger.\nThe position of EP 260601a was above the Earth horizon as seen from\nCALET, and was observable by CGBM at the trigger time, with an incident\nangle of 83 degrees.\n\nThe ground-processed light curve is available at:\nhttps://cgbm.calet.jp/cgbm_trigger/ground/1464376270/\n\nThe CALET data used in this analysis were provided by\nthe Waseda CALET Operation Center located at Waseda University.",
  "submittedHow": "web",
  "circularId": 44773,
  "subject": "GRB 260601B: CALET Gamma-Ray Burst Monitor detection",
  "createdOn": 1780425344447
}