{
  "bibcode": "2019GCN.25830....1Y",
  "body": "A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), \nY. Kawakubo (LSU), K. Yamaoka (Nagoya U), 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\n\nThe CALET Gamma-ray Burst Monitor (CGBM) was operating at the\ntrigger time of S190923y T0 = 2019-09-23 12:55:59.646 UT (The\nLIGO Scientific Collaboration and Virgo Collaboration, GCN Circ.\n25814).\n\nNo CGBM on-board trigger occurred around the event time.  Based\non the LIGO-Virgo localization sky map, the summed LIGO probabilities \ninside the CGBM HXM (7 - 3000 keV) and SGM (40 keV - 28 MeV) fields \nof view are 40 % and 55 %, respectively (and 68 % credible region \nof the initial sky map was above the horizon).  The HXM and  SGM \nfields of view were centered at RA = 62.7 deg, Dec = 4.2 deg and \nRA = 55.3 deg, Dec = -2.5 deg at T0, respectively.\n\nBased on the analysis of the light curve data with 0.125 sec time \nresolution from T0-60 sec to T0+60 sec, we found no significant \nexcess around the trigger 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 S190923y. Using the CAL data, we have \nsearched for gamma-ray events in the 10-100 GeV band from -60 sec \nto +60 sec from the GW trigger time and found no candidates in the \noverwrap region with the LIGO-Virgo high probability localization\nregion.  The 90% upper limit of CAL is 1.2x10^-5 erg/cm^2/s \n(10-100 GeV) when the summed LIGO-Virgo probability reaches 10%.\nThe CAL FOV was centered at RA= 55.3 deg, DEC= -2.5 deg at T0.",
  "circularId": 25830,
  "createdOn": 1569295143000,
  "email": "kawakubo1@lsu.edu",
  "subject": "LIGO/Virgo S190923y: Upper limits from CALET observations.",
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>",
  "eventId": "LIGO/Virgo S190923y"
}