{
  "bibcode": "2019GCN.25647....1C",
  "body": "N. Cannady (GSFC/UMBC), 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),\nY. Shimizu, T. Tamura (Kanagawa U), 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 \ntime of S190901ap T0 = 2019-09-01 23:31:01.838 UT (The LIGO Scientific\nCollaboration and Virgo Collaboration, GCN Circ. 25606 and 25614).\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 6 % and 61 %, respectively (and 82 % credible region \nof the updated localization map was above the horizon).  The HXM and \nSGM fields of view were centered at RA = 345.1 deg, Dec = 22.4 deg\nand RA = 353.8 deg, Dec = 16.7 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 (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 low energy trigger\nmode at the trigger time of S190901ap. 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 overwrap region with the LIGO-Virgo probability map. \nThe 90% upper limit of CAL is 6.3x10^-5 erg/cm^2/s (1-10 GeV) when\nthe summed LIGO-Virgo probability reaches 5%.\nThe CAL FOV was centered at RA= 353.8 deg, Dec= 16.6 deg at T0.",
  "circularId": 25647,
  "createdOn": 1567580815000,
  "email": "kawakubo1@lsu.edu",
  "subject": "LIGO/Virgo S190901ap: Upper limits from CALET observations.",
  "submitter": "Yuta Kawakubo at Louisiana State U./CALET  <kawakubo1@lsu.edu>",
  "eventId": "LIGO/Virgo S190901ap"
}