{
  "bibcode": "2017GCN.21067....1Y",
  "body": "Y. Yamada, A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,\nA. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),\nI. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU),\nS. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena)\nand the CALET collaboration:\n\nThe short-duration GRB 170428A (Beardmore et al., GCN Circ. 21042; Tsvetkova\net al., GCN Circ. 21045) was detected the CALET Gamma-ray Burst Monitor (CGBM)\nby the ground process pipeline at 09:13:42.36 on 28 April 2017 at 5.1 sigma which\nis below the trigger threshold of the on-board trigger.  The burst signal was seen\nonly by the SGM instrument.\n\nBecause there was no on-board trigger, no event data were stored for this\nevent.  The continuous light curve data recorded in 0.125 s time resolution are\nnot fine enough to investigate the temporal structure and the duration of this event.\n\nThe light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/flight/1177405621/\n\nThe CALET data used in this analysis are provided by the Waseda\nCALET Operation Center located at the Waseda University.",
  "circularId": 21067,
  "createdOn": 1493887642000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 170428A CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 170428A"
}