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Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April
The well studied blazar 3C 279 underwent a giant $\gamma$-ray outburst in 2014 March-April. The measured $\gamma$-ray flux (1.21 $\pm$ 0.10 $\times$ 10$^{-5}$ ph cm$^{-2}$ s$^{-1}$ in 0.1-300 GeV
The Peculiar Radio-loud Narrow Line Seyfert 1 Galaxy 1H 0323+342
We present a multiwavelength study of the radio-loud narrow-line Seyfert 1 galaxy (NLSy1) 1H 0323+342, detected by the Fermi Gamma-Ray Space Telescope. Multiband light curves show many orphan X-ray
General Physical Properties of CGRaBS Blazars
We present the results of a multi-frequency, time-averaged analysis of blazars included in the Candidate Gamma-ray Blazar Survey catalog. Our sample consists of 324 $\gamma$-ray detected
Violent Hard X-ray Variability of Mrk 421 Observed by NuSTAR in 2013 April
The well studied blazar Markarian 421 (Mrk 421, $z$=0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high energy (VHE,
The TACTIC atmospheric Cherenkov Imaging telescope
The TACTIC (TeV Atomospheric Cherenkov Telescope with Imaging Camera) γγ-ray telescope, equipped with a light collector of area ∼9.5m2 and a medium resolution imaging camera of 349 pixels, has been
Study on temporal and spectral behaviour of 3C 279 during 2018 January flare
We present a detailed temporal and spectral study of the blazar 3C\,279 using multi-wavelength observations from Swift-XRT, Swift-UVOT and Fermi-LAT during a flare in 2018 January. The temporal
A two-zone synchrotron model for the knots in the M87 jet
The flux and the spectral index in the X-ray energy band from the knots of the M87 jet as observed by Chandra indicate a possible synchrotron origin but cannot be explained by simple one-zone models
Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012
Abstract We have observed Markarian 501 in Very High Energy (VHE) gamma-ray wavelength band for 70.6 h from 15 April to 30 May, 2012 using TACTIC telescope. Detailed analysis of ∼66.3 h of clean data
Multi-wavelength study of Mrk 421 TeV flare observed with TACTIC telescope in February 2010
Abstract We present results from multi-wavelength study of intense flaring activity from a high frequency peaked BL Lac object Mrk 421. The source was observed in its flaring state on February 16,
High energy emission processes in OJ 287 during 2009 flare
The broad-band spectrum of a BL Lac object, OJ 287, from radio to γ-rays obtained during a major γ-ray flare detected by Fermi in 2009 is studied to understand the high energy emission mechanism