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SUMMARY:The impact of the Calorimeter-only photons in the Fermi-LAT analys
 is of VHE sources
DTSTART;VALUE=DATE-TIME:20151029T094000Z
DTEND;VALUE=DATE-TIME:20151029T095500Z
DTSTAMP;VALUE=DATE-TIME:20260905T043110Z
UID:indico-contribution-937@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Speakers: Mitsunari Takahashi (ICRR)\nAbove tens of GeV\, gamm
 a-ray observations with the Fermi Large Area Telescope (LAT) are often dom
 inated by statistical uncertainties due to the low source flux and the lim
 ited acceptance. The newly released Pass 8 analysis extended the acceptanc
 e of Fermi-LAT to ~ 2.5 m^2 sr over 100 GeV\, and made effective an event 
 class that can improve the acceptance at these very high gamma-ray energie
 s: the “Calorimeter-only (CalOnly)” event class. While the conventiona
 l event classes require information from the LAT tracker\, the CalOnly eve
 nt class\, which is still under development\, can recover ~40-50% of event
 s above 50 GeV without usable tracker information\, at the expense of a wo
 rse angular resolution and larger cosmic-ray background. In the conference
  we will describe the working principle\, and report on the performance of
  this new event class using Monte Carlo simulations and real data from ast
 rophysical VHE sources from the recently-released catalog of LAT sources a
 bove 50 GeV (2FHL).\n\nhttps://indico.icrr.u-tokyo.ac.jp/event/23/contribu
 tions/937/
LOCATION: Room 5.6
URL:https://indico.icrr.u-tokyo.ac.jp/event/23/contributions/937/
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