TITLE: GCN CIRCULAR NUMBER: 25932 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-191001A DATE: 19/10/03 08:28:18 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC191001A neutrino event (GCN�25913) �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 2019-10-01��20:09:18.17�UTC (T0) with J2000 position RA =�314.08 (+6.56, -2.26) deg, Decl. =�12.94 (+1.50, -1.47) deg 90% PSF containment. Two cataloged gamma-ray sources (The Fermi-LAT collaboration, 2019, arXiv:1902.10045)�are found within the 90% localization error of IC191001A. These are�the millisecond pulsar 4FGL�J2052.7+1218 (a.k.a.�PSR J2052+1218)�and the blazar candidate of uncertain type 4FGL J2115.2+1218 (a.k.a. NVSS J211522+121802), at a distance of 1.1 deg and�4.7 deg�from the best fit,�respectively. We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source.�Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the�IC191001A�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 < 3.7e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / 2019-10-02 UTC), < 2e-8 (< 2.9e-7) 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 this source the�Fermi-LAT contact persons are S. Garrappa (simone.garrappa atdesy.de ) and S. Buson (sara.buson atgmail.com ). 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.