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8 papers
Study of variability in long-term multiwavelength optical lightcurves of blazar AO 0235+164
Abhradeep Roy, Alok C. Gupta, Varsha R. Chitnis +9
We present a long-term and intraday variability study on optical multiwaveband () data from the blazar AO 0235+164 collected by various telescopes for 44 years (19…
Detection of a quasi-periodic oscillation in the optical light curve of the remarkable blazar AO 0235+164
Abhradeep Roy, Varsha R. Chitnis, Alok C. Gupta +8
We present a long term optical band light curve analysis of the gravitationally lensed blazar AO 0235+164 in the time span 1982 - 2019. Several methods of analysis lead to the…
Transient Quasi-Periodic Oscillations at -rays in the TeV Blazar PKS 1510-089
Abhradeep Roy, Arkadipta Sarkar, Anshu Chatterjee +3
We present periodicity search analyses on the -ray lightcurve of the TeV blazar PKS 1510-089 observed by the \textit{Fermi} Large Area Telescope. We report the detection of two…
Temporal and Spectral Study of PKS B1222+216 Flares in 2014
Anshu Chatterjee, Abhradeep Roy, Arkadipta Sarkar +1
We report on temporal and spectral study of a flat spectrum radio quasar, PKS B1222+216, in flare state to get insight into acceleration and emission mechanisms inside the jet. Thi…
Multiwavelength Study of the Quiescent States of Six Brightest Flat Spectrum Radio Quasars detected by Fermi-LAT
Abhradeep Roy, Sonal R. Patel, Arkadipta Sarkar +2
The regular monitoring of flat-spectrum radio quasars (FSRQs) in -rays by Fermi-LAT since past 12 years indicated six sources who exhibited extreme -ray outbursts crossing da…
Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
The IceCube, Fermi-LAT, MAGIC +13
Individual astrophysical sources previously detected in neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neut…