{
  "bibcode": "2017GCN.20513....1K",
  "body": "Y. Kawakubo, A. Yoshida, T. Sakamoto, M. Moriyama, Y. Yamada (AGU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU),\nY. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu,\nT. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU),\nS. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena)\nand the CALET collaboration:\n\nThe CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger time\nof G270580 (GCN Circ. 20486).  No CGBM on-board trigger occurred at the time\nof the event.  Based on the LIGO localization sky map (LIB_skymap.fits.gz),\nthe southern arc of the high probability area was in the field-of-view of CGBM.\nThe summed LIGO probabilities inside the HXM and the SGM field of view\nare 24% and 33%.\n\nBased on the analysis of the light curve data with 0.125 sec time resolution\nfrom -60 sec to 60 sec from the trigger time, we found no significant excess\naround the trigger time in either the HXM (7-1000 keV) or the SGM (0.1-20 MeV)\ndata.\n\nThe CALET Calorimeter (CAL) was operating in high energy trigger mode at the trigger\ntime of G270580.  Using CAL data, we have searched for gamma-ray events above\n10 GeV from -60 sec to +60 sec from the GW trigger time and found no candidates.\nThe summed LIGO probabilities inside the CAL field of view is ~4%.",
  "circularId": 20513,
  "createdOn": 1485262512000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "LIGO/Virgo G270580: CALET Observations",
  "submitter": "Takanori Sakamoto at Aoyama Gakuin U  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "LIGO/Virgo G270580"
}