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The radiation mechanism of very high energy $\gamma$-ray emission fromblazars and crucial parameters like magnetic field, and size of the emittingregion are not well understood yet. To understand the above mentionedproperties of blazars, we observed five nearby TeV $\gamma$-ray emittingblazars (Mrk421, Mrk501, 1ES2344+514, 1ES1218+304 and 3C454.3) and one radiogalaxy (M87) using the High Altitude GAmma Ray (HAGAR) telescope. HAGAR is anarray of seven telescopes located at Hanle, India to detect Cherenkov lightcaused by extensive air showers initiated by $\gamma$-rays. Mrk421 was observedto undergo one of its brightest flaring episodes on 2010 February 17, anddetected by various experiments in X-rays and $\gamma$- rays. HAGARobservations of this source during 2010 February 13 - 19, in the energies above250 GeV show an enhancement in the flux level, with a flux of 6-7 Crab unitsbeing detected on 2010 February 17. We present the spectral energy distributionof the source during this flaring episode. In addition to this, the analysisprocedure to extract $\gamma$-ray signal from HAGAR data is discussed andpreliminary results on all the AGNs are presented.

Multiwavelength study of TeV Blazar Mrk421 during giant flare and observations of TeV AGNs with HAGAR