{
  "bibcode": "2019GCN.24101....1S",
  "body": "Volodymyr Savchenko, Carlo Ferrigno�� (ISDC/UniGE, Switzerland)\nJames Rodi,�� (IAPS-Roma, Italy)\nSandro Mereghetti (INAF IASF-Milano, Italy)\n\non behalf of the INTEGRAL multi-messenger collaboration:\nhttps://www.astro.unige.ch/cdci/integral-multimessenger-collaboration\n\nUsing INTEGRAL we have performed a search for a prompt gamma-ray\ncounterpart of S190412m (GCN #24098).\n\nAt the time of the event (2019-04-12 05:30:44 UTC, hereafter T0),\nINTEGRAL was operating in nominal mode. The peak of the event\nlocalization probability was at an angle of 120 deg with respect to\nthe spacecraft pointing axis. This orientation implies a strongly\nsuppressed response of IBIS, a somewhat suppressed response of\nIBIS/Veto, and a somewhat suppressed response of SPI-ACS.\n\nThe SPI-ACS background within ��300 seconds around the event was very\nstable.\nWe do not detect any significant counterparts and estimate a 3-sigma\nupper limit on the 75-2000 keV fluence of 2.9e-07 erg/cm^2for a burst\nlasting less than 1 s with a characteristic short GRB spectrum (an\nexponentially cut off power law with alpha=-0.5 and Ep=600 keV)\noccurring at any time in the interval within 300 s around T0.\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~2.5e-07 (9.1e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV\nenergy range.",
  "circularId": 24101,
  "createdOn": 1555061753000,
  "email": "savchenk@in2p3.fr",
  "subject": "INTEGRAL prompt observation of S190412m",
  "submitter": "Volodymyr Savchenko at ISDC,U of Geneve  <savchenk@in2p3.fr>"
}