60 citations · 177 across the 7 of their papers we have counts for
7 papers
Multi-wavelength temporal and spectral variability of the blazar OJ 287 during and after the December 2015 flare: a major accretion disc contribution
P. Kushwaha, A. C. Gupta, P. J. Wiita +33
We present a multi-wavelength spectral and temporal analysis of the blazar OJ 287 during its recent activity between December 2015 -- May 2016, showing strong variability in the ne…
Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April-May, 2012
P Chandra, K K Singh, R C Rannot +23
We have observed Markarian 501 in Very High Energy (VHE) gamma-ray wavelength band for 70.6 hours from 15 April to 30 May, 2012 using TACTIC telescope. Detailed analysis of 6…
Multi-band optical variability of three TeV Blazars on Diverse Timescales
Alok C. Gupta, A. Agarwal, J. Bhagwan +7
We present our optical photometric observations of three TeV blazars, PKS 1510-089, PG 1553+113 and Mrk 501 taken using two telescopes in India, one in Bulgaria, one in Greece and…
Flux and spectral variability of the blazar PKS 2155-304 with XMM-Newton: Evidence of Particle Acceleration and Synchrotron Cooling
Jai Bhagwana, A. C. Gupta, I. E. Papadakis +1
We have analyzed XMM-Newton observations of the high energy peaked blazar, PKS 2155-304, made on 24 May 2002 in the 0.3 - 10 keV X-ray band. These observations display a mini-flare…
Multi-band variability in the blazar 3C 273 with XMM-Newton
Nibedita Kalita, Alok C. Gupta, Paul J. Wiita +2
We have undertaken a nearly simultaneous optical/UV and X-ray variability study of the flat spectrum radio quasar, 3C 273 using data available from the XMMNewton satellite missi…
Search for TeV --ray emission from blazar 1ES1218+304 with TACTIC telescope during March-April 2013
K. K. Singh, K. K. Yadav, A. K. Tickoo +22
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 Tele…
Spectral energy distributions of the BL Lac PKS 2155-304 from XMM-Newton
Jai Bhagwan, Alok C. Gupta, I. E. Papadakis +1
We have used all 20 archival XMM-Newton observations of PKS 2155-304 with simultaneous X-ray and UV/optical data to study its long term flux and spectral variability. We find signi…