{
  "bibcode": "2019GCN.25239....1G",
  "body": "S. Garrappa (DESY-Zeuthen, DE), S. Buson (Univ. of Wuerzburg, DE; UMBC, \nUSA)�and D. Gasparrini (ASI SSDC;�INFN Roma Tor Vergata, IT), on behalf \nof the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the high-energy \nIC190730A neutrino event (GCN 25225) 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 2019-07-30 20:50:41.31 UTC \n(T0) with J2000 position RA = 225.79 (-1.43,+1.28) deg, Decl. = +10.47 \n(-0.89,+1.14) deg 90% PSF containment. One cataloged >100 MeV gamma-ray \nsource is located within the 90% IC190730A localization error, at a \ndistance of roughly 0.3 deg. This is the object 4FGL J1504.4+1029�(The \nFermi-LAT Collaboration 2019, arXiv:1902.10045) associated with the FSRQ \nPKS 1502+106. Based on a preliminary analysis of the LAT data over \nthe-timescales of 1-day and 1-week prior to T0, this object is not \nsignificantly detected at gamma-rays. A preliminary light curve of the \nobject is available at the FSSC \n(https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PKS_1502p106). \nWe note that for multiple years PKS1502+106 has been among the top-ten \nhighest-fluence blazars in the whole sky when the integrated long-term \nGeV gamma-ray flux is considered. After a long high-activity phase of \nabout 4.5 years, its gamma-ray flux has slowly decreased over the past \nyear and is currently much lower than what was observed in the previous \n11 years of LAT monitoring.\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 IC190730A 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 < 1.9e-9 ph cm^-2 s^-1 for ~11-years (2008-08-04 / \n2019-07-31 UTC), < 4.6e-9 (< 1.4e-8) ph cm^-2 s^-1 for a 1-month \n(1-week) integration 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 person are S. Garrappa (simone.garrappa at desy.de) and S. Buson \n(sara.buson at gmail.com). The Fermi LAT is a pair conversion telescope \ndesigned to cover the energy band from 20 MeV to greater than 300 GeV. \nIt is the product of an international collaboration between NASA and DOE \nin the U.S. and many scientific institutions across France, Italy, Japan \nand Sweden.",
  "circularId": 25239,
  "createdOn": 1564611223000,
  "email": "simone.garrappa@desy.de",
  "subject": "Fermi-LAT Gamma-ray Observations of IceCube-190730A",
  "submitter": "Simone Garrappa at DESY  <simone.garrappa@desy.de>",
  "eventId": "IceCube-190730A"
}