{
  "bibcode": "2023GCN.33248....1S",
  "body": "J. Sinapius (DESY-Zeuthen), S. Garrappa (Ruhr-Universitaet Bochum) and S.\nBuson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC230201A\nhigh-energy neutrino event (GCN 33244) with all-sky survey data from the\nLarge Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope.\nThe IceCube event was detected on 2023-02-01 at 06:20:54.42 UT (T0) with\nJ2000 position RA = 345.41 (+2.50, -3.07) deg, Decl. = +12.10 (+1.62,\n-1.53) deg (90% PSF containment). Three cataloged gamma-ray (>100 MeV; The\nFermi-LAT collaboration 2022, ApJS, 260, 53) sources are located within the\n90% IC230201A  localization region. Based on a preliminary analysis of the\nLAT data over the timescales of 1-day and 1-month prior to T0, these\nobjects are not significantly detected (> 5 sigma).\n\nWe searched for intermediate (days to years) timescale emission from a new\ngamma-ray transient source. Preliminary analysis indicates no significant\n(> 5 sigma) new excess emission (> 100 MeV) at the IC230201A best-fit\nposition. Assuming a power-law spectrum (photon index = 2.0 fixed) for a\npoint source at the IC230201A best-fit position, the >100 MeV flux upper\nlimit (95% confidence) is < 2.8e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04\nto 2023-02-01 UTC), and < 3.6e-9 (<2.4e-7) ph cm^-2 s^-1 for a 1-month\n(1-day) integration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular\nmonitoring of this region will continue. For these observations the\nFermi-LAT contact persons are S. Garrappa (simone.garrappa at\nruhr-uni-bochum.de), J. Sinapius (jonas.sinapius at desy.de) and S. Buson\n(sara.buson at uni-wuerzburg.de).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy\nband from 20 MeV to greater than 300 GeV. It is the product of an\ninternational collaboration between NASA and DOE in the U.S. and many\nscientific institutions across France, Italy, Japan and Sweden.",
  "circularId": 33248,
  "createdOn": 1675284073000,
  "email": "sara.buson@gmail.com",
  "subject": "Fermi-LAT gamma-ray observations of IceCube-230201A",
  "submitter": "Sara Buson at GSFC/Fermi  <sara.buson@gmail.com>",
  "eventId": "IceCube-230201A"
}