P. Chandra, R. C. Rannot, K. K. Yadav, A. K. Tickoo, K. K. Singh, K. Chanchalani, M. Kothari, N. K. Agarwal, A. Goyal, H. C. Goyal, S. Kotwal, N. Kumar, P. Marandi, K. Venugopal, C. K. Bhat, N. Bhatt, S. Bhattacharya, C. Borwankar, N. Chouhan, V. K. Dhar, S. R. Kaul, S. K. Koul, M. K. Koul, R. Koul, A. K. Mitra, S. Sahayanathan, M. Sharma
We have observed the blazar Markarian 421 with the TACTIC $\gamma$-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
$\gamma$-ray signal with a statistical significance of 12.12$\sigma$ at
$E_{\gamma}\geq$ 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 ($dF/dE=f_0 E^{-\Gamma}$) with
$f_0=(1.39\pm0.239)\times 10^{-11}cm^{-2}s^{-1}TeV^{-1}$ and
$\Gamma=2.31\pm0.14$.
View original:
http://arxiv.org/abs/1202.2984
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