TITLE: GCN CIRCULAR NUMBER: 31558 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-220205B DATE: 22/02/07 17:35:34 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and J. Sinapius (DESY-Zeuthen) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC220205B neutrino event (GCN 31554) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2022-02-05 20:08:10.59 UTC (T0) with J2000 position RA = 266.80 (+/- 0.51) deg, Decl. = -3.58 (+/-0.51) deg 90% PSF containment. One cataloged >100 MeV gamma-ray source is located within the 90% IC211216B localization error. This is 4FGL J1747.8-0316, located 0.34 deg from the neutrino best-fit position  (The Fourth Fermi-LAT catalog DR3; The Fermi-LAT collaboration 2022, arXiv:2201.11184). Based on a preliminary analysis of the LAT data over a 1-month and 1-day integration time before T0, this object is not significantly detected at gamma rays. We searched for the existence of intermediate (months to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (0.1 - 300 GeV) within the IC220205B 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube best-fit position, the >100 MeV flux upper limit (95% confidence) is < 3.3-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 / 2022-02-05 UTC), < 2.8e-8 (< 9e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) and S. Buson (sara.buson at uni-wuerzburg.de). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.