| Description |
PKS 1222+216 is a flat spectrum radio quasar, a class of blazars'
characterize by high luminosity and presence of strong
emission lines in its ultraviolet-Optical spectrum. Two prominent
gamma-ray flare of about a week duration were
detected by the Fermi-LAT in April and June 2010 with a rising time of
~day. The excellent photon statistics with
continuous and broadband energy coverage of Fermi-LAT enable us to
extract light-curves in different energy
bands on daily and sub-daily timescales. The extracted light-curves
shows variety of temporal characteristics and
variability patterns with contrasting behavior during both flares. We
will discuss the implications of these high
energy flares on the theoretical study of emission and particle
acceleration processes which cannot be explain
by the radiative and adiabatic cooling alone. We will also present a
time dependent model for 2nd LAT flare during
which the source was detected at very high energy (E> 100 GeV) by the
MAGIC observatory with a variability timescale
of ~ 10 mintutes.
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