{
  "bibcode": "2019GCN.26459....1G",
  "body": "S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) on behalf of \nthe Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the high-energy \nIC191215A neutrino event (GCN 26435) with all-sky survey data from the \nLarge Area Telescope (LAT), on board the Fermi Gamma-ray Space \nTelescope. The IceCube event was detected on 2019-12-15 11:09:57.63 UTC \n(T0) with J2000 position RA =285.87 (+2.88 -3.19) deg, Decl. = 58.92 \n(+1.85 -2.25) deg 90% PSF containment. One cataloged >100 MeV gamma-ray \nsource is located within the 90% IC191215A localization error, at a \ndistance of roughly 1.88 deg. This is the object 4FGL J1858.7+5708�(The \nFermi-LAT Collaboration 2019, arXiv:1902.10045) associated with the \nblazar candidate object of uncertain type 87GB 185759.9+570427. Based on \na preliminary analysis of the LAT data over the timescales of 1-day and \n1-month prior to T0, this object is not significantly detected at \ngamma-rays.\n\nWe searched for the existence of intermediate (months to years) \ntimescale emission from a new gamma-ray transient source. Preliminary \nanalysis indicates no significant (>5sigma) new excess emission (> 100 \nMeV) within the IC191215A 90% confidence localization. Assuming a \npower-law spectrum (photon index = 2.0 fixed) for a point source at the \nIceCube best-fit position, the >100 MeV flux upper limit (95% \nconfidence) is < 2.2e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / \n2019-12-15 UTC), < 4.2e-8 (< 1e-8) ph cm^-2 s^-1 for a 1-day (1-month) \nintegration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular \nmonitoring of the region will continue. For this event the Fermi-LAT \ncontact person are S. Garrappa (simone.garrappa atdesy.de \n<http://desy.de/>) and S. Buson (sara.buson atgmail.com \n<http://gmail.com/>). The Fermi LAT is a pair conversion telescope \ndesigned to cover the energy band from 20 MeV to greater than 300 GeV. \nIt is the product of an international collaboration between NASA and DOE \nin the U.S. and many scientific institutions across France, Italy, Japan \nand Sweden.",
  "circularId": 26459,
  "createdOn": 1576540029000,
  "email": "simone.garrappa@desy.de",
  "subject": "Fermi-LAT Gamma-ray Observations of IceCube-191215A",
  "submitter": "Simone Garrappa at DESY  <simone.garrappa@desy.de>",
  "eventId": "IceCube-191215A"
}