{"paper":{"title":"TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. Goyal, A.K. Mitra, A.K. Tickoo, C. Borwankar, C.K. Bhat, H.C. Goyal, K. Chanchalani, K. K. Singh, K.K. Yadav, K.Venugopal, M.K. Koul, M. Kothari, M. Sharma, N. Bhatt, N. Chouhan, N.K. Agarwal, N. Kumar, P. Chandra, P. Marandi, R.C. Rannot, R. Koul, S. Bhattacharya, S.K. Koul, S. Kotwal, S.R. Kaul, S. Sahayanathan, V.K. Dhar","submitted_at":"2012-02-14T10:28:07Z","abstract_excerpt":"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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.2984","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}