{
  "bibcode": "2020GCN.26669....1G",
  "body": "S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf \nof the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the high-energy \nIC200107A neutrino event (GCN 26655) 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 2020-01-07 at 09:42:18.36 \nUT (T0) with J2000 position RA =148.18 (+ 2.20, - 1.83) deg, Decl. = \n35.46 (+ 1.10, - 1.22) deg 90% PSF containment. Two cataloged >100 MeV \ngamma-ray sources (The Fermi-LAT Collaboration 2019, \narXiv:1902.10045)�are located within the 90% IC200107A localization \nerror. These are the objects 4FGL J0955.1+3551 associated with the BL \nLac object 1RXS J095508.2+355054 and 4FGL J0957.8+3423 associated with \nthe blazar candidate object of uncertain type B2 0954+34. Based on a \npreliminary analysis of the LAT data over the timescales of 1-day and \n1-month prior to T0, these objects are 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 IC200107A 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 < 1e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / \n2020-01-07 UTC), < 1e-8 (< 1e-7) ph cm^-2 s^-1 for a 1-month (1-day) \nintegration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular \nmonitoring of this source will continue. For this source the Fermi-LAT \ncontact persons are S. Garrappa (simone.garrappa at desy.de \n<http://desy.de/>) and S. Buson (sara.buson at uni-wuerzburg.de \n<http://uni-wuerzburg.de/>). The Fermi LAT is a pair conversion \ntelescope designed to cover the energy band from 20 MeV to greater than \n300 GeV. It is the product of an international collaboration between \nNASA and DOE in the U.S. and many scientific institutions across France, \nItaly, Japan and Sweden.",
  "circularId": 26669,
  "createdOn": 1578500835000,
  "email": "simone.garrappa@desy.de",
  "subject": "Fermi-LAT Gamma-ray Observations of IceCube-200107A",
  "submitter": "Simone Garrappa at DESY  <simone.garrappa@desy.de>",
  "eventId": "IceCube-200107A"
}