VHE observation of Mrk 421 with TACTIC during 2012; multiwavelength study

The nearby (z=0.031) TeV γ-ray emitter BL Lac object Mrk 421 has been observed with the TACTIC telescope for nearly 118 hours during 01 February to 26 April, 2012 (MJD 55958-56044). Detailed analysis reveals the detection of 529 ± 76 γ-rays with 6.9σ significance above 850  GeV energy threshold during the period of 15-26 March, 2012 (MJD 56001-56013). Nearly simultaneous multiwavelength observations of the source also indicate a comparatively higher flux state during this period (MJD 56001-56013). In this paper, we present the study of Mrk 421 during this period in very high energy (VHE) domain along with the results from high energy (HE), X-ray, optical and radio observations. We reproduce the spectral energy distribution (SED) of the source during this period using the synchrotron and synchrotron self-Compton (SSC) process. The model parameters of the emission region of the source are found to be consistent with the values reported in the literature.