{
  "bibcode": "2019GCN.23779....1M",
  "body": "S. Matsukawa, A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),\nY. Kawakubo (LSU), A. Tezuka, H. Onozawa, T. Ito, H. Morita, Y. Sone (AGU),\nK. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU),\nY. Asaoka, S. Ozawa, S. Torii (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U),\nW. Ishizaki (ICRR), M. L. Cherry (LSU),\nS. Ricciarini (U of Florence),\nA. V. Penacchioni, P. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nAt 12:55:17.284 UTC on 21 January 2019, the CALET Gamma-ray Burst \nMonitor (CGBM)\ntriggered on GRB 190121A.\nThe burst signal was detected only by the SGM detector.\nBecause of a problem in one of the ground alert processing scripts,\nthe GCN notice was not distributed automatically for this event.\n\nThis GRB is also clearly seen by the publicly available\nINTEGRAL SPI-ACS light curve.\n\nThe burst light curve shows a short pulse which\nstarts at T-0.224 sec and ends at T+0.096 sec.\nThe T90 and the T50 durations measured by the SGM data are\n0.288 s +- 0.091 sec and 0.128 +- 0.101 sec (40-1000 keV), respectively.\n\nThe ground processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1232110402/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at the Waseda University.",
  "circularId": 23779,
  "createdOn": 1548331708000,
  "email": "val@phys.aoyama.ac.jp",
  "subject": "GRB 190121A: CALET Gamma-Ray Burst Monitor detection of a short burst",
  "submitter": "Valentin Pal'shin at AGU  <val@phys.aoyama.ac.jp>",
  "eventId": "GRB 190121A"
}