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SUMMARY:Unidentified EGRET sources and their possible Fermi counterparts
DTSTART;VALUE=DATE-TIME:20161011T121500Z
DTEND;VALUE=DATE-TIME:20161011T124500Z
DTSTAMP;VALUE=DATE-TIME:20260720T225228Z
UID:indico-contribution-603@cern.ch
DESCRIPTION:Speakers: Alexander Lyapin (National Research Nuclear Universi
 ty "MEPhI")\nUnidentified EGRET sources from 3EG catalog have been analyze
 d. Preliminary data analysis has shown at least 31 of these sources coinci
 de with those in 3FGL Fermi catalogue within 1\,2 and 3 sigma error interv
 als of the coordinates and fluxes. Their properties are discussed in the p
 resented work.\nEven 3-sigma difference allows supposing sources similarit
 y because of more than 3-sigma distinctions in values of fluxes between id
 entified EGRET sources and their Fermi counterparts. For instance\, the co
 incidence between 3EG J1255-0549 and J1256.1-0547 was reported in Fermi ca
 talogues 1FGL\, 2FGL\, 3FGL. However\, these sources fluxes (in units of 1
 0^-8 photons × cm^-2 × s^-1) in the energy band E > 100 MeV are 179.7±6
 .7 (3EG)\, 44.711±0.724 (3FGL)\, 53.611±0.997 (2FGL) and 67.939±1.861 (
 1FGL). Such effect observed for sufficient portion of identified EGRET sou
 rces. It could cause by troubles of particles identification by Fermi/LAT 
 trigger system. Very often charged particles recognized as gamma-quanta be
 cause of wrong backsplash analysis. Nevertheless\, gammas counts as charge
 d particles due analogous reason and rejected during ground data processin
 g. For example\, it appears as geomagnetic modulation presence on gamma-qu
 anta count rate latitudinal profiles in energy band E>20  MeV.\n\nhttps://
 indico.particle.mephi.ru/event/4/contributions/603/
LOCATION:Milan Hotel Hall of the 2nd floor
URL:https://indico.particle.mephi.ru/event/4/contributions/603/
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