{
  "bibcode": "2019GCN.23927....1R",
  "body": "J. Rodi, A. Bazzano, L. Natalucci, F. Panessa, P. Ubertini\n(IAPS-Roma, Italy)\nV. Savchenko, C. Ferrigno, E. Bozzo, T. Courvoisier\n(ISDC/UniGE, Switzerland)\nE. Kuulkers (ESTEC/ESA, The Netherlands)\nC. Sanchez (ESAC/ESA, Spain)\nS. Mereghetti (INAF IASF-Milano, Italy)\nJ. Chenevez, S. Brandt (DTU, Denmark)\nR. Diehl, A. von Kienlin (MPE, Germany)\nD. Gotz, Ph. Laurent, A. Goldwurm\n(DRF/Irfu/DAp Saclay/CEA, France)\nA. Coleiro (APC, France)\nL. Hanlon, A. Martin-Carrillo (UCD, Ireland)\nJ.-P. Roques, E. Jourdain, P. von Ballmoos (IRAP, France)\nA. Domingo, J. M. Mas-Hesse (CAB/CSIC-INTA, Spain)\nA. Lutovinov, R. Sunyaev (IKI, Russia)\n\n\nUsing INTEGRAL we have performed a search for a prompt gamma-ray\ncounterpart of the cosmic neutrino candidate IceCube-190221A\n(GCN 23918).\n\nAt the time of the event (2019-02-21 08:25:40 UTC, hereafter T0),\nINTEGRAL was operating in nominal mode. The peak of the neutrino\nlocalization probability was at an angle of 20 deg with respect to\nthe spacecraft pointing axis. This orientation implies strongly\nsuppressed response of IBIS/Veto and SPI-ACS, but near-optimal\nresponse of IBIS out of its coded Field of View.\n\nThe background within +/-300 seconds around the event was very\nstable.�� We do not detect any significant counterparts and estimate\na 3-sigma upper limit on the 75-2000 keV fluence of 5.2e-07 erg/cm^2\nfor a burst lasting less than 1 s with a characteristic short GRB\nspectrum (an exponentially cut off power law with alpha=-0.5 and\nEp=600 keV) occurring at any time in the interval within 300 s\naround T0.\n\nFor a typical long GRB spectrum (Band function with alpha=-1,\nbeta=-2.5, and Ep=300 keV), the derived peak flux upper limit is\n~4.7e-07 (1.7e-07) erg/cm^2/s at 1 s (8 s) time scale in 75-2000\nkeV energy range.",
  "circularId": 23927,
  "createdOn": 1551128829000,
  "email": "savchenk@in2p3.fr",
  "subject": "INTEGRAL observation of IceCube-190221A",
  "submitter": "Volodymyr Savchenko at ISDC,U of Geneve  <savchenk@in2p3.fr>",
  "eventId": "IceCube-190221A"
}