TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10

We have observed the blazar Markarian 421 with the TACTIC $γ$-ray telescope at Mt. Abu, India, from 22 November 2009 to 16 May 2010 for 265 hours. Detailed analysis of the data so recorded revealed presence of a TeV $γ$-ray signal with a statistical significance of 12.12$σ$ at $E_γ\geq$ 1 TeV. We have estimated the time averaged differential energy spectrum of the source in the energy range 1.0 - 16.44 TeV. The spectrum fits well with the power law function of the form ($dF/dE=f_0 E^{-Γ}$) with $f_0=(1.39\pm0.239)\times 10^{-11}cm^{-2}s^{-1}TeV^{-1}$ and $Γ=2.31\pm0.14$.

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