{
  "bibcode": "2019GCN.24626....1V",
  "body": "F. Verrecchia (SSDC, and INAF-OAR), C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS,\nand Univ. Roma Tor Vergata),  F. Lucarelli, C. Pittori (SSDC, and INAF-OAR),\nM. Cardillo (INAF/IAPS), G. Piano A. Ursi (INAF/IAPS), A. Bulgarelli, V.\nFioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari),\nF. Longo (Univ. Trieste, and INFN Trieste), report on behalf of the AGILE Team:\n\nIn response to the LIGO-Virgo GW event S190521g at T0 = 2019-05-21 03:02:29.47\nUTC (GCN #24621) a preliminary analysis of the AGILE exposure at T0 showed\nthe S190521g 90% c.l. localization region (LR) was not exposed\nby the Gamma-Ray Imaging Detector (GRID), the nearest exposure in time occurred\nat T0-15s covering about 60% of the LR near the Galactic north pole at off-axis\nangles between 15 and 60 deg.\n\nWe performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV\nover three time intervals before and after T0, when good exposure of\nthe S190521g 90% c.l. LR was available.\n\nThe following preliminary GRID 3-sigma upper limit (UL) values are obtained\nover a large area of the exposed LR:\n\n(T0-15s; T0-5s ): from 2.7e-07 to 1.4e-06 erg cm^-2 s^-1;\n\n(T0-100s; T0 ): from 4.5e-08 to 5.4e-07 erg cm^-2 s^-1;\n\n(T0+900s; T0+1000s): from 3.0e-08 to 5.0e-07 erg cm^-2 s^-1.\n\nAn image of the AGILE-GRID 10s exposure near T0 is available at the site\nhttps://tools.ssdc.asi.it/ImgView/Agile/S190521g_T0-15s_d10s_bayest_fv70a75off13\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": 24626,
  "createdOn": 1558420466000,
  "email": "francesco.verrecchia@ssdc.asi.it",
  "subject": "LIGO-Virgo S190521g: Upper Limits from AGILE-GRID observations",
  "submitter": "Francesco Verrecchia at ASDC  <francesco.verrecchia@ssdc.asi.it>",
  "eventId": "LIGO-Virgo S190521g"
}