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Aryabhatta Research Institute of Observational Sciences: Nainital, Uttarakhand, IN

2008-01-07 to present | Scientist - F
Employment
Source: Self-asserted source
Alok C. Gupta

Education and qualifications (1)

Deen Dayal Upadhyay Gorakhpur University: Gorakhpur, Uttar Pradesh, IN

Ph.D.
Education
Source: Self-asserted source
Alok C. Gupta

Works (50 of 58)

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Page 1 of 2

Spectral Energy Distribution Variability of the Blazar OJ 287 During 2009–2021

The Astrophysical Journal
2025-02-01 | Journal article
DOI: 10.3847/1538-4357/ad9f30
Contributors: Wenwen Zuo; Alok C. Gupta; Minfeng Gu; Mauri J. Valtonen; Svetlana G. Jorstad; Margo F. Aller; Anne Lähteenmäki; Sebastian Kiehlmann; Pankaj Kushwaha; Hugh D. Aller et al.
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Multiband Optical Variability of the Blazar 3C 454.3 on Diverse Timescales

The Astrophysical Journal Supplement Series
2025-01-01 | Journal article
DOI: 10.3847/1538-4365/ad8e3d
Contributors: Karan Dogra; Alok C. Gupta; C. M. Raiteri; M. Villata; Paul J. Wiita; S. O. Kurtanidze; S. G. Jorstad; R. Bachev; G. Damljanovic; C. Lorey et al.
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Testing colour–magnitude pattern as a method in the search for changing-look AGNs

Monthly Notices of the Royal Astronomical Society
2024-12-20 | Journal article
DOI: 10.1093/mnras/stae2774
Contributors: Li-Tao Zhu; Zhongxiang Wang; P U Devanand; Alok C Gupta; Karan Dogra; Jie Li; Ju-Jia Zhang; Shun-Hao Ji; Si-Si Sun
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Crossref

Revisiting Radio Variability of the Blazar 3C 454.3

The Astrophysical Journal
2024-12-01 | Journal article
DOI: 10.3847/1538-4357/ad90e3
Contributors: Ashutosh Tripathi; Alok C. Gupta; Krista Lynne Smith; Paul J. Wiita; Margo F. Aller; Alexandr E. Volvach; Anne Lähteenmäki; Hugh D. Aller; Merja Tornikoski; Larisa N. Volvach
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Rapid optical flare in the extreme teraelectronvolt blazar 1ES 0229+200 on intraday timescales with the Transiting Exoplanet Survey Satellite

Astronomy & Astrophysics
2024-10 | Journal article
DOI: 10.1051/0004-6361/202449888
Contributors: S. Kishore; A. C. Gupta; P. J. Wiita; S. N. Tiwari
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Crossref

Optical Continuum Reverberation Mapping of a Candidate IMBH in a Nearby Seyfert 1 Galaxy

The Astrophysical Journal
2024-10-01 | Journal article
DOI: 10.3847/1538-4357/ad71d4
Contributors: Wenwen Zuo; Hengxiao Guo; Jingbo Sun; Qi Yuan; Paulina Lira; Minfeng Gu; Philip G. Edwards; Alok C. Gupta; Shubham Kishore; Jamie Stevens et al.
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X-ray flux and spectral variability of the blazar OJ 287 with Suzaku

Monthly Notices of the Royal Astronomical Society
2024-07-19 | Journal article
DOI: 10.1093/mnras/stae1722
Contributors: Dongtao Zhou; Zhongli Zhang; Alok C Gupta; Pankaj Kushwaha; Paul J Wiita; Minfeng Gu; Haiguang Xu
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Crossref

Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary System

The Astrophysical Journal Letters
2024-06-01 | Journal article
DOI: 10.3847/2041-8213/ad4d9b
Contributors: Mauri J. Valtonen; Staszek Zola; Alok C. Gupta; Shubham Kishore; Achamveedu Gopakumar; Svetlana G. Jorstad; Paul J. Wiita; Minfeng Gu; Kari Nilsson; Alan P. Marscher et al.
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Crossref

Rapid Optical Flares in the Blazar OJ 287 on Intraday Timescales with TESS

The Astrophysical Journal
2024-01-01 | Journal article
DOI: 10.3847/1538-4357/ad0b80
Contributors: Shubham Kishore; Alok C. Gupta; Paul J. Wiita
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Crossref

Multiband cross-correlated radio variability of the blazar 3C 279

Monthly Notices of the Royal Astronomical Society
2023-11-27 | Journal article
DOI: 10.1093/mnras/stad3583
Contributors: Krishna Mohana A; Alok C Gupta; Alan P Marscher; Yulia V Sotnikova; S G Jorstad; Paul J Wiita; Lang Cui; Margo F Aller; Hugh D Aller; Yu A Kovalev et al.
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Optical intraday variability of the blazar S5 0716+714

Monthly Notices of the Royal Astronomical Society
2023-11-27 | Journal article
DOI: 10.1093/mnras/stad3574
Contributors: Tushar Tripathi; Alok C Gupta; Ali Takey; Rumen Bachev; Oliver Vince; Anton Strigachev; Pankaj Kushwaha; E G Elhosseiny; Paul J Wiita; G Damljanovic et al.
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Crossref

Quasi-simultaneous Optical Flux and Polarization Variability of the Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of an Anticorrelation in Flux and Polarization Variability

The Astrophysical Journal Letters
2023-11-01 | Journal article
DOI: 10.3847/2041-8213/acfd2e
Contributors: Alok C. Gupta; Pankaj Kushwaha; Mauri J. Valtonen; Sergey S. Savchenko; Svetlana G. Jorstad; Ryo Imazawa; Paul J. Wiita; Minfeng Gu; Alan P. Marscher; Zhongli Zhang et al.
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Multiband optical variability on diverse time-scales of the TeV blazar TXS 0506 + 056, the first cosmic neutrino source

Monthly Notices of the Royal Astronomical Society
2023-10-28 | Journal article
DOI: 10.1093/mnras/stad3232
Contributors: Vinit Dhiman; Alok C Gupta; Rumen Bachev; Paul J Wiita; Sergio A Cellone; A Strigachev; Haritma Gaur; A Darriba; D P Bisen; G Locatelli et al.
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Crossref

On the need of an ultramassive black hole in OJ 287

Monthly Notices of the Royal Astronomical Society
2023-08-09 | Journal article
DOI: 10.1093/mnras/stad2249
Contributors: Mauri J Valtonen; Staszek Zola; A Gopakumar; Anne Lähteenmäki; Merja Tornikoski; Lankeswar Dey; Alok C Gupta; Tapio Pursimo; Emil Knudstrup; Jose L Gomez et al.
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Multiwavelength Temporal Variability of the Blazar PKS 1510–089

The Astrophysical Journal
2023-08-01 | Journal article
DOI: 10.3847/1538-4357/acdd74
Contributors: Q. Yuan; Pankaj Kushwaha; Alok C. Gupta; Ashutosh Tripathi; Paul J. Wiita; M. Zhang; X. Liu; Anne Lähteenmäki; Merja Tornikoski; Joni Tammi et al.
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The Detection of Possible Transient Quasiperiodic Oscillations in the γ-Ray Light Curve of PKS 0244-470 and 4C+38.41

The Astrophysical Journal
2023-06-01 | Journal article
DOI: 10.3847/1538-4357/acd17f
Contributors: Avik Kumar Das; Raj Prince; Alok C. Gupta; Pankaj Kushwaha
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Intra-night optical flux and polarization variability of BL Lacertae during its 2020–2021 high state

Monthly Notices of the Royal Astronomical Society
2023-04-21 | Journal article
DOI: 10.1093/mnras/stad1063
Contributors: Rumen Bachev; Tushar Tripathi; Alok C Gupta; Pankaj Kushwaha; Anton Strigachev; Alexander Kurtenkov; Yanko Nikolov; Svetlana Boeva; Goran Damljanovic; Oliver Vince et al.
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Refining the OJ 287 2022 impact flare arrival epoch

Monthly Notices of the Royal Astronomical Society
2023-03-31 | Journal article
DOI: 10.1093/mnras/stad922
Contributors: Mauri J Valtonen; Staszek Zola; A Gopakumar; Anne Lähteenmäki; Merja Tornikoski; Lankeswar Dey; Alok C Gupta; Tapio Pursimo; Emil Knudstrup; Jose L Gomez et al.
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Crossref

Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164

The Astrophysical Journal Supplement Series
2023-03-01 | Journal article
DOI: 10.3847/1538-4365/acb059
Contributors: Abhradeep Roy; Alok C. Gupta; Varsha R. Chitnis; Sergio A. Cellone; Claudia M. Raiteri; Gustavo E. Romero; Paul J. Wiita; Anshu Chatterjee; Jorge A. Combi; Mai Liao et al.
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Optical Flux and Spectral Variability of BL Lacertae during Its Historical High Outburst in 2020

The Astrophysical Journal
2023-02-01 | Journal article
DOI: 10.3847/1538-4357/aca801
Contributors: Nibedita Kalita; Yuhai Yuan; Minfeng Gu; Junhui Fan; Yosuke Mizuno; Peng Jiang; Alok C. Gupta; Hongyan Zhou; Xiang Pan; Anton A. Strigachev et al.
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Detection of Quasiperiodic Oscillations in the Blazar S4 0954+658 with TESS

The Astrophysical Journal
2023-01-01 | Journal article
DOI: 10.3847/1538-4357/aca809
Contributors: Shubham Kishore; Alok C. Gupta; Paul J. Wiita
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Crossref

Multiband optical variability of the TeV blazar PG 1553 + 113 in 2019

Monthly Notices of the Royal Astronomical Society
2022-12-30 | Journal article
DOI: 10.1093/mnras/stac3709
Contributors: Vinit Dhiman; Alok C Gupta; Sofia O Kurtanidze; I Eglitis; A Strigachev; G Damljanovic; Paul J Wiita; Minfeng Gu; Haritma Gaur; Oliver Vince et al.
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Crossref

Study of X-Ray Intraday Variability of HBL Blazars Based on Observations Obtained with XMM-Newton

The Astrophysical Journal
2022-11-01 | Journal article
DOI: 10.3847/1538-4357/ac9064
Contributors: P. U. Devanand; Alok C. Gupta; V. Jithesh; Paul J. Wiita
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Crossref

Launching the VASCO Citizen Science Project

Universe
2022-10 | Journal article | Author
DOI: 10.3390/universe8110561
Contributors: Beatriz Villarroel; Kristiaan Pelckmans; Enrique Solano; Mikael Laaksoharju; Abel Souza; nnaemeka onyeuwaoma; Khaoula Laggoune; Jamal Mimouni; Hichem Guergouri; Lars Mattsson et al.
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Multidisciplinary Digital Publishing Institute

X-Ray Intraday Variability of the TeV Blazar Markarian 421 with XMM-Newton

The Astrophysical Journal Supplement Series
2022-09-01 | Journal article
DOI: 10.3847/1538-4365/ac7799
Contributors: A Priyana Noel; Haritma Gaur; Alok C. Gupta; Alicja Wierzcholska; Michał Ostrowski; Vinit Dhiman; Gopal Bhatta
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Crossref

Long-term Multiband Near-infrared Variability of the Blazar OJ 287 during 2007–2021

The Astrophysical Journal Supplement Series
2022-06-01 | Journal article
DOI: 10.3847/1538-4365/ac6c2c
Contributors: Alok C. Gupta; Pankaj Kushwaha; L. Carrasco; Haiguang Xu; Paul J. Wiita; G. Escobedo; A. Porras; E. Recillas; Y. D. Mayya; V. Chavushyan et al.
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Crossref

Detection of a quasi-periodic oscillation in the optical light curve of the remarkable blazar AO 0235+164

Monthly Notices of the Royal Astronomical Society
2022-05-24 | Journal article
DOI: 10.1093/mnras/stac1287
Contributors: Abhradeep Roy; Varsha R Chitnis; Alok C Gupta; Paul J Wiita; Gustavo E Romero; Sergio A Cellone; Anshu Chatterjee; Jorge A Combi; Claudia M Raiteri; Arkadipta Sarkar et al.
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Crossref

A Search for Cosmic Ray Bursts at 0.1 PeV with a Small Air Shower Array

Symmetry
2022-03 | Journal article | Author
DOI: 10.3390/sym14030501
Contributors: Roger Clay; Jassimar Singh; Piotr Homola; Olaf Bar; Dmitriy Beznosko; Apoorva Bhatt; Gopal Bhatta; Łukasz Bibrzycki; Budnev; David Edwin Alvarez-Castillo et al.
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Multidisciplinary Digital Publishing Institute

X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021

Monthly Notices of the Royal Astronomical Society
2022-02-16 | Journal article
DOI: 10.1093/mnras/stac286
Contributors: G S Pavana Gowtami; Haritma Gaur; Alok C Gupta; Paul J Wiita; Mai Liao; Martin Ward
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Crossref

Transient quasi-periodic oscillations at γ-rays in the TeV blazar PKS 1510-089

Monthly Notices of the Royal Astronomical Society
2022-01-11 | Journal article
DOI: 10.1093/mnras/stab3701
Contributors: Abhradeep Roy; Arkadipta Sarkar; Anshu Chatterjee; Alok C Gupta; Varsha Chitnis; P J Wiita
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Crossref

Optical Variability of a Newly Discovered Blazar Sample from the BZCAT Catalog

The Astrophysical Journal Supplement Series
2021-12-01 | Journal article
DOI: 10.3847/1538-4365/ac1e9c
Contributors: Nibedita Kalita; Alok C. Gupta; Minfeng Gu
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Crossref

Blazar OJ 287 after First VHE Activity: Tracking the Reemergence of the HBL-like Component in 2020

The Astrophysical Journal
2021-11-01 | Journal article
DOI: 10.3847/1538-4357/ac19b8
Contributors: Pankaj Kushwaha; Main Pal; Nibedita Kalita; Neeraj Kumari; Sachindra Naik; Alok C Gupta; E. M. de Gouveia Dal Pino; Minfeng Gu
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Crossref

CNN-Based Classifier as an Offline Trigger for the CREDO Experiment

Sensors
2021-07 | Journal article | Author
DOI: 10.3390/s21144804
Contributors: Marcin Piekarczyk; Olaf Bar; Łukasz Bibrzycki; Michał Niedźwiecki; Krzysztof Rzecki; Sławomir Stuglik; Thomas Andersen; Budnev; David Edwin Alvarez-Castillo; Kévin Almeida Cheminant et al.
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Multidisciplinary Digital Publishing Institute

Multiband variability of the TeV blazar PG 1553+113 with XMM–Newton

Monthly Notices of the Royal Astronomical Society
2021-07-13 | Journal article
DOI: 10.1093/mnras/stab1743
Contributors: Vinit Dhiman; Alok C Gupta; Haritma Gaur; Paul J Wiita
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Crossref

X-Ray Intraday Variability of the TeV Blazar PKS 2155–304 with Suzaku during 2005–2014

The Astrophysical Journal
2021-03-01 | Journal article
DOI: 10.3847/1538-4357/abdd38
Contributors: Zhongli Zhang; Alok C. Gupta; Haritma Gaur; Paul J. Wiita; Tao An; Yang Lu; Shida Fan; Haiguang Xu
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Crossref

Quasi-periodic oscillations in the long-term radio light curves of the blazar AO 0235+164

Monthly Notices of the Royal Astronomical Society
2021-01-23 | Journal article
DOI: 10.1093/mnras/stab058
Contributors: Ashutosh Tripathi; Alok C Gupta; Margo F Aller; Paul J Wiita; Cosimo Bambi; Hugh Aller; Minfeng Gu
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Crossref

The dual nature of blazar fast variability: Space and ground observations of S5 0716+714

Monthly Notices of the Royal Astronomical Society
2020-12-30 | Journal article
DOI: 10.1093/mnras/staa3561
Contributors: C M Raiteri; M Villata; D Carosati; E Benítez; S O Kurtanidze; A C Gupta; D O Mirzaqulov; F D’Ammando; V M Larionov; T Pursimo et al.
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Crossref

Multiwaveband quasi-periodic oscillation in the blazar 3C 454.3

Monthly Notices of the Royal Astronomical Society
2020-12-17 | Journal article
DOI: 10.1093/mnras/staa3211
Contributors: Arkadipta Sarkar; Alok C Gupta; Varsha R Chitnis; Paul J Wiita
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Crossref

Cosmic-Ray Extremely Distributed Observatory

Symmetry
2020-11 | Journal article | Author
DOI: 10.3390/sym12111835
Contributors: Piotr Homola; Dmitriy Beznosko; Gopal Bhatta; Łukasz Bibrzycki; Michalina Borczyńska; Łukasz Bratek; Nikolay Budnev; Dariusz Burakowski; David Edwin Alvarez-Castillo; Kevin Almeida Cheminant et al.
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Multidisciplinary Digital Publishing Institute

Multi-waveband quasi-periodic oscillations in the light curves of blazar CTA 102 during its 2016–2017 optical outburst

Astronomy & Astrophysics
2020-10 | Journal article
DOI: 10.1051/0004-6361/202038052
Contributors: Arkadipta Sarkar; Pankaj Kushwaha; Alok C. Gupta; Varsha R. Chitnis; Paul J. Wiita
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Crossref

A possible γ-ray quasi-periodic oscillation of ∼314 days in the blazar OJ 287

Monthly Notices of the Royal Astronomical Society
2020-10-09 | Journal article
DOI: 10.1093/mnras/staa2899
Contributors: Pankaj Kushwaha; Arkadipta Sarkar; Alok C Gupta; Ashutosh Tripathi; Paul J Wiita
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Crossref

Temporal and Spectral Variability of OJ 287 before the April–June 2020 Outburst

Galaxies
2020-08-06 | Journal article
DOI: 10.3390/galaxies8030058
Contributors: Nibedita Kalita; Alok C. Gupta; Minfeng Gu
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Crossref

Optical variability of three extreme TeV blazars

Monthly Notices of the Royal Astronomical Society
2020-08-01 | Journal article
DOI: 10.1093/mnras/staa1598
Contributors: Ashwani Pandey; Alok C Gupta; G Damljanovic; P J Wiita; O Vince; M D Jovanovic
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Crossref

Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales

The Astrophysical Journal
2020-02-10 | Journal article
DOI: 10.3847/1538-4357/ab698e
Contributors: Ashwani Pandey; Alok C. Gupta; Sofia O. Kurtanidze; Paul J. Wiita; G. Damljanovic; R. Bachev; Jin Zhang; O. M. Kurtanidze; A. Darriba; R. A. Chigladze et al.
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Crossref

Long-term Variability and Correlation Study of the Blazar 3C 454.3 in the Radio, NIR, and Optical Wavebands

The Astrophysical Journal
2019-12-20 | Journal article
DOI: 10.3847/1538-4357/ab5281
Contributors: A. Sarkar; V. R. Chitnis; A. C. Gupta; H. Gaur; S. R. Patel; P. J. Wiita; A. E. Volvach; M. Tornikoski; W. Chamani; S. Enestam et al.
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Crossref

X-Ray Intraday Variability of the TeV Blazar Mrk 421 with Suzaku

The Astrophysical Journal
2019-10-20 | Journal article
DOI: 10.3847/1538-4357/ab3f3a
Contributors: Zhongli Zhang; Alok C. Gupta; Haritma Gaur; Paul J. Wiita; Tao An; Minfeng Gu; Dan Hu; Haiguang Xu
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Crossref

Signature of Stochastic Acceleration and Cooling Processes in an Outburst Phase of the TeV Blazar ON 231

The Astrophysical Journal
2019-07-20 | Journal article
DOI: 10.3847/1538-4357/ab2765
Contributors: Nibedita Kalita; Utane Sawangwit; Alok C. Gupta; Paul J. Wiita
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Crossref

Characterizing Optical Variability of OJ 287 in 2016–2017

The Astronomical Journal
2019-03-01 | Journal article
DOI: 10.3847/1538-3881/aafe7d
Contributors: Alok C. Gupta; Haritma Gaur; Paul J. Wiita; A. Pandey; P. Kushwaha; S. M. Hu; O. M. Kurtanidze; E. Semkov; G. Damljanovic; A. Goyal et al.
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Crossref

Detection of a quasi-periodic oscillation in γ-ray light curve of the high redshift blazar B2 1520+31

Monthly Notices of the Royal Astronomical Society
2019-02-11 | Journal article
DOI: 10.1093/mnras/stz395
Contributors: Alok C Gupta; Ashutosh Tripathi; Paul J Wiita; Pankaj Kushwaha; Zhongli Zhang; Cosimo Bambi
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Crossref

Optical Variability of TeV Blazars on long time-scales

Monthly Notices of the Royal Astronomical Society
2019-02-04 | Journal article
DOI: 10.1093/mnras/stz322
Contributors: Haritma Gaur; Alok C Gupta; R Bachev; A Strigachev; E Semkov; P J Wiita; O M Kurtanidze; A Darriba; G Damljanovic; R G Chanishvili et al.
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Crossref
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