{
  "bibcode": "2020GCN.26664....1Y",
  "body": "K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, V. Pal'shin, \nS. Sugita (AGU), Y. Kawakubo (LSU), S. Nakahira (RIKEN),\nY. Asaoka, S. Torii (Waseda U), Y. Shimizu, \nT. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), \nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger\ntime of S200105ae T0 = 2020-01-05 16:24:26.057 UT (The LIGO Scientific\nCollaboration and Virgo Collaboration, GCN Circ.26640).\n\nNo CGBM on-board trigger occurred around the event time. Based on the\nLIGO-Virgo localization sky map, the summed LIGO probabilities inside\nthe CGBM HXM (7 - 3000 keV) and SGM (40 keV - 28 MeV) fields of view\nare 71 % and 82 %, respectively (and 84 % credible region of the\ninitial sky map was above the horizon).  The HXM and SGM fields of\nview were centered at RA = 42.4 deg, Dec =-23.7 deg and RA = 50.5 \ndeg, Dec = -30.6 deg at T0, respectively.\n\nCGBM high voltages were turning on around T0-60 sec.  Based on the \nanalysis of the light curve data with 0.125 sec time resolution from\nT0-50 sec to T0+60 sec, we found no significant excess around the \ntrigger time in either the HXM or the SGM data.\n\nThe CALET Calorimeter (CAL) was operating in the high energy trigger\nmode at the trigger time of S200105ae. Using the CAL data, we have\nsearched for gamma-ray events in the 10-100 GeV band from -60 sec to\n+60 sec from the GW trigger time and found no candidates in the\noverwrap region with the LIGO-Virgo high probability localization\nregion. \n\nThe 90% upper limit of CAL is 6.5x10^-6 erg/cm^2/s (10-100 GeV) when\nthe summed LIGO-Virgo probability reaches 60%.\nThe CAL FOV was centered at RA= 50.6 deg, DEC= -30.6 deg at T0.",
  "circularId": 26664,
  "createdOn": 1578463915000,
  "email": "kawakubo1@lsu.edu",
  "subject": "LIGO/Virgo S200105ae: Upper limits from CALET observations.",
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>",
  "eventId": "LIGO/Virgo S200105ae"
}