{
  "bibcode": "2021GCN.31333....1C",
  "body": "M. L. Cherry (LSU),\nA. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),\nY. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nS. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 211227A (Swift detection and refined analysis:\nBeardmore et al., GCN Circ. 31316, Lien et al., GCN Circ. 31326;\nMAXI/GSC detection: Tominaga et al., GCN Circ. 31319;\nhttps://gcn.gsfc.nasa.gov/other/211227A.gcn3) triggered the CALET Gamma-ray\nBurst Monitor (CGBM) at 23:32:07.476 UTC on 27 December 2021.\nThe burst signal was seen by all CGBM detectors.\nBecause of a problem in one of the ground alert processing script, the GCN\nnotice was not distributed automatically for this event.\n\nThe burst light curve shows a multi-peaked structure which starts\nat T-0.6 sec and ends at T+77.2 sec.\nThe T90 and T50 durations measured by the SGM data are 64.5 +- 10.3 sec and\n22.0 +- 2.0 sec (40-1000 keV), respectively.\n\nThe ground processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1324683113/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at the Waseda University.",
  "circularId": 31333,
  "createdOn": 1640765016000,
  "email": "val@phys.aoyama.ac.jp",
  "subject": "GRB 211227A: CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Valentin Pal'shin at AGU  <val@phys.aoyama.ac.jp>",
  "eventId": "GRB 211227A"
}