{
  "bibcode": "2022GCN.31546....1G",
  "body": "S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and J. \nSinapius (DESY-Zeuthen) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the high-energy \nIC220202A neutrino event (GCN 31543) 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 2022-02-02 11:48:38.59 UTC \n(T0) with J2000 position RA = 21.36 (+1.10, -0.77) deg, Decl. = -3.88 \n(+0.42, -0.64) deg 90% PSF containment. No cataloged gamma-ray sources \nare found within the 90% IC220202A localization error (The Fourth \nFermi-LAT catalog DR3; The Fermi-LAT collaboration 2022, arXiv:2201.11184).\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) at the the IC220202A best-fit position. Assuming a power-law \nspectrum (photon index = 2.0 fixed) for a point source at the IC220202A \nbest-fit position, the >100 MeV flux upper limit (95% confidence) is < \n2.4-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 / 2022-02-02 UTC), < \n3.7e-9 (< 5.7e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time \nbefore T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular \nmonitoring of this source will continue. For these observations the \nFermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) \nand S. Buson (sara.buson at uni-wuerzburg.de). The Fermi LAT is a pair \nconversion telescope designed to cover the energy band from 20 MeV to \ngreater than 300 GeV. It is the product of an international \ncollaboration between NASA and DOE in the U.S. and many scientific \ninstitutions across France, Italy, Japan and Sweden.",
  "circularId": 31546,
  "createdOn": 1643918992000,
  "email": "simone.garrappa@desy.de",
  "subject": "Fermi-LAT Gamma-ray Observations of IceCube-220202A",
  "submitter": "Simone Garrappa at DESY  <simone.garrappa@desy.de>",
  "eventId": "IceCube-220202A"
}