{
  "bibcode": "2018GCN.22641....1S",
  "body": "T. Sakamoto, A. Yoshida, V. Pal'shin, Y. Kawakubo, A. Tezuka, S. Matsukawa,\nH. Onozawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU),\nY. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),\nW. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence),\nA. V. Penacchioni, P. S. Marrocchesi (U of Siena)\nand the CALET collaboration:\n\nThe long-duration, soft-spectrum, bright GRB 180411B (Konus-Wind trigger time on 08:38:56.08)\ntriggered the CALET Gamma-ray Burst Monitor (CGBM) at 08:37:29.769 UTC on 11 April 2018.\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows several multi-peaked pulses which start at T0, peak at T+82 sec\nand end at T+123 sec.  The T90 and the T50 durations measured by the SGM data are\n99.0 +- 1.8 sec and 43.8 +- 1.7 sec (40-1000 keV), respectively.  Despite its brightness,\nthe burst signal is seen only below ~300 keV indicating the soft spectrum.\n\nThe ground processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1207471016/\n\nThe CALET data used in this analysis are provided by the Waseda CALET Operation Center\nlocated at the Waseda University.",
  "circularId": 22641,
  "createdOn": 1523535766000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 180411B: CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 180411B"
}