{
  "bibcode": "2019GCN.24589....1D",
  "body": "Maeve Doyle, Bozzo Enrico\nV. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland)\nJ. Rodi (IAPS-Roma, Italy)\nA. Coleiro (APC, France)\nS. Mereghetti (INAF IASF-Milano, Italy)\n\non behalf of the INTEGRAL multi-messenger collaboration:\nhttps://www.astro.unige.ch/cdci/integral-multimessenger-collaboration\n\nAt the time of the LIGO/Virgo event S190517h (2019-05-17 05:51:01 UTC, \nhereafter T0),\nINTEGRAL was operating in nominal mode. The peak of the event\nlocalization probability was at an angle of 90 deg with respect to the\nspacecraft pointing axis. This orientation implies a strongly suppressed\n(8.7% of optimal) response of ISGRI, strongly suppressed (19% of\noptimal) response of IBIS/Veto, and somewhat suppressed (61% of\noptimal) response of SPI-ACS.\n\nThe background within +/-300 seconds around the event was rather\nunstable (excess variance 1.9).\n\nWe have performed a search for any impulsive events in INTEGRAL SPI-\nACS (as described in Savchenko et al. 2012, A&A 541A, 122S), IBIS, and\nIBIS/Veto data.\n\nWe do not detect any significant counterparts and estimate a 3-sigma\nupper limit on the 75-2000 keV fluence of 2.7e-07 erg/cm^2 for 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. For a\ntypical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and\nEp=300 keV), the derived peak flux upper limit is ~2.3e-07 (1.1e-08)\nerg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range",
  "circularId": 24589,
  "createdOn": 1558208773000,
  "email": "carlo.Ferrigno@unige.ch",
  "subject": "LIGO/Virgo S190517h: INTEGRAL prompt observation",
  "submitter": "Carlo Ferrigno at IAAT/ISDC  <carlo.Ferrigno@unige.ch>",
  "eventId": "LIGO/Virgo S190517h"
}