{
  "subject": "LIGO/Virgo S190910h: Upper limits from CALET observations.",
  "eventId": "LIGO/Virgo S190910h",
  "bibcode": "2019GCN.25735....1C",
  "createdOn": 1568345901000,
  "circularId": 25735,
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>",
  "email": "kawakubo1@lsu.edu",
  "body": "M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, V. Pal'shin,\nS. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),\nS. Nakahira (RIKEN), Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, \nT. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), \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 \ntime of S190910h T0 = 2019-09-10 08:29:58.544 UT (The LIGO Scientific\nCollaboration and Virgo Collaboration, GCN Circ. 25707).\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 16 % and 50 %, respectively (and 75 % credible region \nof the initial localization map was above the horizon).  The HXM and \nSGM fields of view were centered at RA = 286.6 deg, Dec = 0.3 deg\nand RA = 294.8 deg, Dec = -5.4 deg at 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 around the trigger\ntime in either the HXM or the SGM data.\n\nThe CALET Calorimeter (CAL) was operating in the low energy trigger\nmode at the trigger time of S190910h. Using the CAL data, we have \nsearched for gamma-ray events in the 1-10 GeV band from -60 sec \nto +60 sec from the GW trigger time and found no candidates \nin the overlap region with the LIGO-Virgo high probability localization\nregion. The 90% upper limit of CAL is 9.4x10^-6 erg/cm^2/s (1-10 GeV)\nwhen the summed LIGO-Virgo probability reaches 10%.  The CAL FOV \nwas centered at RA= 294.8 deg, DEC= -5.5 deg at T0."
}