{
  "bibcode": "2019GCN.24246....1P",
  "body": "G. Piano, M. Cardillo (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor\nVergata), F. Verrecchia (SSDC, and INAF/OAR), A. Ursi, C. Casentini\n(INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli,\nN. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo\n(Univ. Trieste, and INFN Trieste),\n\nreport on behalf of the AGILE Team:\n\nIn response to the LIGO-Virgo GW event S190426c at T0 = 2019-04-26\n15:21:55.337 (UT), we performed a preliminary analysis of the AGILE\nGamma-Ray Imaging Detector (GRID) at different timescales in the energy\nrange 50 MeV - 10 GeV.\n\nAt T0 the accessible LIGO/Virgo 90% c.l. localization region (LR), which\nincludes the Celestial North Pole, was observed at off-axis angles between\n10 and 70 deg. Preliminary values of 3-sigma upper limits (UL) obtained at\nLIGO/Virgo trigger time (T0) are:\n\n(1) from 5.5e-7 to 3.2e-6 erg cm^-2 s^-1 for an integration time of 5s\nstarting from T0, with the GRID exposure covered nearly 75% of this part of\nthe LR.\n\n(2) from 2.8e-7 to 1.6e-6  erg cm^-2 s^-1 for an integration time of 10s\nstarting from T0, with the GRID exposure covered nearly 80% of this part of\nthe LR.\n\n(3) from 3.9e-8 to 1.6e-7  erg cm^-2 s^-1 for an integration time of 100s\nstarting from T0, with the GRID exposure covered 100% of this part of the\nLR.\n\nThe other part of the LR (R.A. in the approximate range between 10 - 16 hr)\nwas partly occulted by the Earth at T0, and is currently in the region not\naccessible by the GRID because of solar panel constraints.\n\nThese measurements were obtained with AGILE observing a large portion of\nthe sky in spinning mode. Additional analysis of AGILE data is in progress.",
  "circularId": 24246,
  "createdOn": 1556309053000,
  "email": "giovanni.piano@inaf.it",
  "subject": "LIGO/Virgo S190426c: AGILE-GRID Observations",
  "submitter": "Giovanni Piano at INAF-IAPS  <giovanni.piano@inaf.it>",
  "eventId": "LIGO/Virgo S190426c"
}