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

Source: [TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10](<https://www.sota2.com/research/paper/68fa303d1e209131ce8737c5>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T18:04:44.528Z

Authors: 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

Published: 2012-02-14T10:28:07.000Z

## Abstract

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 $\\Gamma=2.31\\pm0.14$.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1202.2984>)

[PDF](<https://arxiv.org/pdf/1202.2984.pdf>)