Search for TeV $\gamma$--ray emission from blazar 1ES1218+304 with TACTIC telescope during March-April 2013
K. K. Singh, K. K. Yadav, A. K. Tickoo, R. C. Rannot, P. Chandra, N., K. Agarwal, K. K. Gaur, A. Goyal, H. C. Goyal, N. Kumar, P. Marandi, M., Kothari, H. Bhatt, K. Chanchalani, N. Chouhan, V. K. Dhar, B. Ghosal, S. R., Kaul, M. K. Koul, R. Koul, K. Venugopal, C. K. Bhat

TL;DR
This study reports on TeV gamma-ray observations of blazar 1ES 1218+304 using the TACTIC telescope, finding no significant activity but setting upper limits and analyzing multi-wavelength data from radio to gamma rays.
Contribution
First simultaneous multi-wavelength analysis of 1ES 1218+304 during TACTIC observations, providing upper limits on TeV emission and multi-band activity without detection.
Findings
No TeV gamma-ray activity detected during observation period.
Established upper limits on TeV flux consistent with previous measurements.
No significant variability observed across radio, optical, UV, X-ray, and gamma-ray bands.
Abstract
In this paper, we present results of TeV --ray observations of the high synchrotron peaked BL Lac object 1ES 1218+304 (z=0.182) with the (TeV Atmospheric Cherenkov Telescope with Imaging Camera). The observations are primarily motivated by the unusually hard GeV-TeV spectrum of the source despite its relatively large redshift. The source is observed in the TeV energy range with the from March 1, 2013 to April 15, 2013 (MJD 56352--56397) for a total observation time of 39.62 h and no evidence of TeV --ray activity is found from the source. The corresponding 99 confidence level upper limit on the integral flux above a threshold energy of 1.1 TeV is estimated to be 3.41 photons cm s (i.e Crab Nebula flux) assuming a power law differential energy spectrum with photon index 3.0, as previously observed by the …
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