# Search for TeV $\\gamma$--ray emission from blazar 1ES1218+304 with TACTIC telescope during March-April 2013

Source: [Search for TeV $\\gamma$--ray emission from blazar 1ES1218+304 with TACTIC telescope during March-April 2013](<https://www.sota2.com/research/paper/68fa31791e209131ce87f2c5>)

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

Data updated: 2025-10-24T18:53:05.883Z

Authors: 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, C. Borwankar, J. Bhagwan, A. C. Gupta

Published: 2014-10-09T06:54:15.000Z

## Abstract

In this paper, we present results of TeV $\\gamma$--ray observations of the high synchrotron peaked BL Lac object 1ES 1218+304 (z=0.182) with the $TACTIC$ (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 $TACTIC$ 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 $\\gamma$--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 $\\times10^{-12}$ photons cm$^{-2}$ s$^{-1}$ (i.e $\<23\\%$ Crab Nebula flux) assuming a power law differential energy spectrum with photon index 3.0, as previously observed by the $MAGIC$ and $VERITAS$ telescopes. For the study of multi-wavelength emission from the source, we use nearly simultaneous optical, UV and and X--ray data collected by the UVOT and XRT instruments on board the \\emph{Swift} satellite and high energy $\\gamma$--ray data collected by the Large Area Telescope on board the \\emph{Fermi} satellite. We also use radio data at 15 GHz from OVRO 40 m telescope in the same period. No significant increase of activity is detected from radio to TeV $\\gamma$--rays from 1ES1218+304 during the period from March 1, 2013 to April 15, 2013.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1410.2369>)

[PDF](<https://arxiv.org/pdf/1410.2369.pdf>)