{
  "bibcode": "2016GCN.19617....1N",
  "body": "S. Nakahira (JAXA), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,\nY. Yamada (AGU), K. Yamaoka (Nagoya U), I. Takahashi (IPMU), Y. Asaoka,\nS. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence) P. S. Marrocchesi (U of Siena)\nand the CALET collaboration:\n\nThe long-duration GRB 160625B (Burns et al., GCN Circ. 19581;\nDirirsa et al. GCN Circ. 19586; INTEGRAL-ACS #7495) triggered the CALET Gamma-ray\nBurst Monitor (CGBM) at 22:40:15.49 on 25 June 2016.  The burst signal\nwas seen by all CGBM instruments.\n\nThe light curve of the SGM shows a precursor emission starting at T+0.5 sec,\npeaking at T+1 sec and ending at T+2 sec.  Then, the bright main burst episode\nfollows starting from T+183 sec and ending at T+233 sec with overlapping\nmultiple pulses.  The T90 duration measured by the SGM data for the main\nbright episode is 20.0 +- 0.4 sec (40-1000 keV).  The T90 duration of the precursor\nemission measured by the SGM data is 0.8 +- 0.1 sec (40-1000 keV).\nThe light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/flight/1150929566/\n\nFurthermore, the main pulse was also detected by Imaging Calorimeter (IMC;\nplastic scintillating fibers) and Charge Detector (CHD; plastic scintillators),\nwhich are subsystems of the CALET main instrument Calorimeter (CAL).  The\nincident angles for this burst was 61 degrees and 67 degrees from the boresight\nof CAL at the trigger time and at the main peak, respectively.\nThe CAL gamma-ray analysis (>1 GeV) is in progress.\n\nThe CALET data used in this analysis are provided by the Waseda CALET Operation\nCenter located at the Waseda University.",
  "circularId": 19617,
  "createdOn": 1467187790000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 160625B CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 160625B"
}