{
  "bibcode": "2019GCN.24617....1N",
  "body": "S. Nakahira (RIKEN),  A. Yoshida, T. Sakamoto, V. Pal'shin,\nS. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),\nY. Asaoka, S. Ozawa, 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\ntrigger time of S190519bj T0 = 2019-05-19 15:35:44.398  UT (The\nLIGO Scientific Collaboration and Virgo Collaboration, GCN Circ.\n24598).\n\nNo CGBM on-board trigger occurred around the event time.  Based\non the LIGO-Virgo localization sky map, most of the high  probability\narea was within the field-of-view of the CGBM SGM.  The summed\nLIGO probabilities inside the CGBM HXM (7-3000 keV) and SGM\n(40 keV - 28 MeV)  fields of view are 32% and 87%, respectively\n(and 100% credible region of the initial localization map was above\nthe horizon).  The HXM and SGM fields of view were centered at\nRA = 244.6 deg, Dec = 61.1 deg and  RA = 243.1 deg, Dec = 51.1 deg\nat T0, respectively.\n\nBased on the analysis of the light curve data with 0.125 sec\ntime resolution from T0-60 sec to T0+60 sec, we found no\nsignificant excess (signal-to-noise ratio >= 7) around the trigger\ntime in either the HXM or the SGM data.\n\nThe CALET Calorimeter (CAL) was operating in the high energy\ntrigger mode at the trigger time of S190519bj. Using CAL data,\nwe have searched for gamma-ray events in the 10-100 GeV\nband from -60 sec to +60 sec from the GW trigger time and\nfound no candidates. There is no significant overlap with the LVC\nlocation probability map.  The CAL FOV was centered\nat RA=243.1 deg, Dec=51.1 deg at T0.\n\n[GCN OPS NOTE(21may19): Per author's request, \"S190519bj\" was edded\nto the Subject line.]",
  "circularId": 24617,
  "createdOn": 1558408974000,
  "email": "kawakubo1@lsu.edu",
  "subject": "S190519bj: No transient candidates from CALET observations",
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>"
}