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X-Ray Intraday Variability of the Blazar OJ 287 Observed with XMM-Newton
Tao Huang, Alok C. Gupta, Lang Cui, Ashutosh Tripathi, Yongfeng Huang, P. U. Devanand and Xiang Liu The Astrophysical Journal 998(1) 107 (2026) https://doi.org/10.3847/1538-4357/ae38b9
Characterizing Multiband Optical Emission and Variability of 1ES 1215+303 on Diverse Timescales
A. Ozdonmez, H. Er, M. Tekkesinoglu, E. Ege, M. E. Kenger, I. C. Ozkesen and A. Polatoğlu The Astrophysical Journal 979(1) 56 (2025) https://doi.org/10.3847/1538-4357/ad9d45
Multiband Optical Variability of the Blazar 3C 454.3 on Diverse Timescales
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, S. S. Savchenko, O. Vince, M. Abdelkareem, F. J. Aceituno, J. A. Acosta-Pulido, I. Agudo, G. Andreuzzi, S. A. Ata, G. V. Baida, L. Barbieri, D. A. Blinov, G. Bonnoli, G. A. Borman, M. I. Carnerero, D. Carosati, et al. The Astrophysical Journal Supplement Series 276(1) 1 (2025) https://doi.org/10.3847/1538-4365/ad8e3d
Multiband Optical Variability of the Blazar OP 313 in the Outburst State during 2024–2025
P. U. Devanand, Alok C. Gupta, Karan Dogra, Shubham Kishore and Tushar Tripathi The Astrophysical Journal 990(2) 214 (2025) https://doi.org/10.3847/1538-4357/adf4c3
X-ray flux and spectral variability of the blazar OJ 287 with Suzaku
Dongtao Zhou, Zhongli Zhang, Alok C Gupta, Pankaj Kushwaha, Paul J Wiita, Minfeng Gu and Haiguang Xu Monthly Notices of the Royal Astronomical Society 532(3) 3285 (2024) https://doi.org/10.1093/mnras/stae1722
Multiwavelength variability of the blazar AO 0235+164
V V Vlasyuk, Y V Sotnikova, A E Volvach, T V Mufakharov, Y A Kovalev, O I Spiridonova, M L Khabibullina, Y Y Kovalev, A G Mikhailov, V A Stolyarov, D O Kudryavtsev, M G Mingaliev, S Razzaque, T A Semenova, A K Kudryashova, N N Bursov, S A Trushkin, A V Popkov, A K Erkenov, I A Rakhimov, M A Kharinov, M A Gurwell, P G Tsybulev, A S Moskvitin, T A Fatkhullin, et al. Monthly Notices of the Royal Astronomical Society 535(3) 2775 (2024) https://doi.org/10.1093/mnras/stae2491
A Supermassive Binary Black Hole Candidate in Mrk 501
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
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, Arkadipta Sarkar and Massimo Villata The Astrophysical Journal Supplement Series 265(1) 14 (2023) https://doi.org/10.3847/1538-4365/acb059
Optical Flux and Spectral Variability of BL Lacertae during Its Historical High Outburst in 2020
Nibedita Kalita, Yuhai Yuan, Minfeng Gu, Junhui Fan, Yosuke Mizuno, Peng Jiang, Alok C. Gupta, Hongyan Zhou, Xiang Pan, Anton A. Strigachev, Rumen S. Bachev and Lang Cui The Astrophysical Journal 943(2) 135 (2023) https://doi.org/10.3847/1538-4357/aca801
Multiband optical variability on diverse time-scales of the TeV blazar TXS 0506 + 056, the first cosmic neutrino source
Vinit Dhiman, Alok C Gupta, Rumen Bachev, Paul J Wiita, Sergio A Cellone, A Strigachev, Haritma Gaur, A Darriba, D P Bisen, G Locatelli, L A Mammana and E Semkov Monthly Notices of the Royal Astronomical Society 527(1) 1344 (2023) https://doi.org/10.1093/mnras/stad3232
Optical intraday variability of the blazar S5 0716+714
Tushar Tripathi, Alok C Gupta, Ali Takey, Rumen Bachev, Oliver Vince, Anton Strigachev, Pankaj Kushwaha, E G Elhosseiny, Paul J Wiita, G Damljanovic, Vinit Dhiman, A Fouad, Haritma Gaur, Minfeng Gu, G E Hamed, Shubham Kishore, A Kurtenkov, Shantanu Rastogi, E Semkov, I Zead and Zhongli Zhang Monthly Notices of the Royal Astronomical Society 527(3) 5220 (2023) https://doi.org/10.1093/mnras/stad3574
Near infrared background with 1.2-m telescope at Mount Abu
Optical and Radio Variability of the Blazar S4 0954+658
V. V. Vlasyuk, Yu. V. Sotnikova, A. E. Volvach, O. I. Spiridonova, V. A. Stolyarov, A. G. Mikhailov, Yu. A. Kovalev, Y. Y. Kovalev, M. L. Khabibullina, M. A. Kharinov, L. Yang, M. G. Mingaliev, T. A. Semenova, P. G. Zhekanis, T. V. Mufakharov, R. Yu. Udovitskiy, A. A. Kudryashova, L. N. Volvach, A. K. Erkenov, A. S. Moskvitin, E. V. Emelianov, T. A. Fatkhullin, P. G. Tsybulev, N. A. Nizhelsky, G. V. Zhekanis and E. V. Kravchenko Astrophysical Bulletin 78(4) 464 (2023) https://doi.org/10.1134/S1990341323600229
Multiband optical variability of a newly discovered 12 blazars sample from 2013–2019
Miljana D Jovanović, Goran Damljanović, François Taris, Alok C Gupta and Gopal Bhatta Monthly Notices of the Royal Astronomical Society 522(1) 767 (2023) https://doi.org/10.1093/mnras/stad904
About 300 days Optical Quasi-periodic Oscillations in the Long-term Light Curves of the Blazar PKS 2155-304
Multiband optical variability of the TeV blazar PG 1553 + 113 in 2019
Vinit Dhiman, Alok C Gupta, Sofia O Kurtanidze, I Eglitis, A Strigachev, G Damljanovic, Paul J Wiita, Minfeng Gu, Haritma Gaur, Oliver Vince, R Bachev, D P Bisen, S Ibryamov, R Z Ivanidze, Miljana D Jovanovic, Omar M Kurtanidze, M G Nikolashvili, E Semkov, B Spassov, M Stojanovic, Beatriz Villarroel, Haiguang Xu and Zhongli Zhang Monthly Notices of the Royal Astronomical Society 519(2) 2796 (2022) https://doi.org/10.1093/mnras/stac3709
Flux and spectral variability of Mrk 421 during its moderate activity state usingNuSTAR: Possible accretion disc contribution?
Long-term Multiband Near-infrared Variability of the Blazar OJ 287 during 2007–2021
Alok C. Gupta, Pankaj Kushwaha, L. Carrasco, Haiguang Xu, Paul J. Wiita, G. Escobedo, A. Porras, E. Recillas, Y. D. Mayya, V. Chavushyan, Beatriz Villarroel and Zhongli Zhang The Astrophysical Journal Supplement Series 260(2) 39 (2022) https://doi.org/10.3847/1538-4365/ac6c2c
Study of X-Ray Intraday Variability of HBL Blazars Based on Observations Obtained with XMM-Newton
X-Ray Intraday Variability of the TeV Blazar Markarian 421 with XMM-Newton
A Priyana Noel, Haritma Gaur, Alok C. Gupta, Alicja Wierzcholska, Michał Ostrowski, Vinit Dhiman and Gopal Bhatta The Astrophysical Journal Supplement Series 262(1) 4 (2022) https://doi.org/10.3847/1538-4365/ac7799
Study of the Rapid Variability of the BL Lac Object MRK 421 in the Optical Range
X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021
G S Pavana Gowtami, Haritma Gaur, Alok C Gupta, et al. Monthly Notices of the Royal Astronomical Society 511(2) 3101 (2022) https://doi.org/10.1093/mnras/stac286
X-Ray Intraday Variability of the TeV Blazar PKS 2155–304 with Suzaku during 2005–2014
Zhongli Zhang, Alok C. Gupta, Haritma Gaur, Paul J. Wiita, Tao An, Yang Lu, Shida Fan and Haiguang Xu The Astrophysical Journal 909(2) 103 (2021) https://doi.org/10.3847/1538-4357/abdd38
Multiband variability of the TeV blazar PG 1553+113 with XMM–Newton
Vinit Dhiman, Alok C Gupta, Haritma Gaur and Paul J Wiita Monthly Notices of the Royal Astronomical Society 506(1) 1198 (2021) https://doi.org/10.1093/mnras/stab1743
Optical Variability of a Newly Discovered Blazar Sample from the BZCAT Catalog
Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales
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, G. Latev, M. G. Nikolashvili, S. Peneva, E. Semkov, A. Strigachev, S. N. Tiwari and O. Vince The Astrophysical Journal 890(1) 72 (2020) https://doi.org/10.3847/1538-4357/ab698e
Multiband optical variability of 3C 279 on diverse time-scales
Aditi Agarwal, Sergio A Cellone, Ileana Andruchow, et al. Monthly Notices of the Royal Astronomical Society 488(3) 4093 (2019) https://doi.org/10.1093/mnras/stz1981
Characterizing Optical Variability of OJ 287 in 2016–2017
Alok C. Gupta, Haritma Gaur, Paul J. Wiita, A. Pandey, P. Kushwaha, S. M. Hu, O. M. Kurtanidze, E. Semkov, G. Damljanovic, A. Goyal, M. Uemura, A. Darriba, Xu Chen, O. Vince, M. F. Gu, Z. Zhang, R. Bachev, R. Chanishvili, R. Itoh, M. Kawabata, S. O. Kurtanidze, T. Nakaoka, M. G. Nikolashvili, Ł. Stawarz and A. Strigachev The Astronomical Journal 157(3) 95 (2019) https://doi.org/10.3847/1538-3881/aafe7d
X-Ray Intraday Variability of the TeV Blazar Mrk 421 with Suzaku
Zhongli Zhang, Alok C. Gupta, Haritma Gaur, Paul J. Wiita, Tao An, Minfeng Gu, Dan Hu and Haiguang Xu The Astrophysical Journal 884(2) 125 (2019) https://doi.org/10.3847/1538-4357/ab3f3a
Optical Flux and Spectral Variability of the TeV Blazar PG 1553+113
Intra-night optical variability of misaligned active galaxies
Debbijoy Bhattacharya, Sanna Gulati and C S Stalin Monthly Notices of the Royal Astronomical Society 483(3) 3382 (2019) https://doi.org/10.1093/mnras/sty3299
Multi-color Optical Monitoring of 10 Blazars from 2005 to 2011
Nankun Meng, Xiaoyuan Zhang, Jianghua Wu, Jun Ma and Xu Zhou The Astrophysical Journal Supplement Series 237(2) 30 (2018) https://doi.org/10.3847/1538-4365/aacffe
X-Ray Flux and Spectral Variability of Six TeV Blazars with NuSTAR
Multiband optical variability of the blazar OJ 287 during its outbursts in 2015–2016
Alok C. Gupta, Aditi Agarwal, Alka Mishra, et al. Monthly Notices of the Royal Astronomical Society 465(4) 4423 (2017) https://doi.org/10.1093/mnras/stw3045
A time dependent approach to model X-ray and γ–ray light curves of Mrk 421 observed during the flare in February 2010
Intra-Night Variability of OJ 287 with Long-Term Multiband Optical Monitoring
Wei Zeng, Qing-Jiang Zhao, Ze-Jun Jiang, Zhi-Hui Kong, Zhen Liu, Dong-Dong Wang, Xiong-Fei Geng, Shen-Bang Yang and Ben-Zhong Dai Galaxies 5(4) 85 (2017) https://doi.org/10.3390/galaxies5040085
Search for Intra-day Optical Variability in Mrk 501
Hai-Cheng Feng, H. T. Liu, X. L. Fan, Yinghe 应和 Zhao 赵, J. M. Bai, Fang Wang, D. R. Xiong and S. K. Li The Astrophysical Journal 849(2) 161 (2017) https://doi.org/10.3847/1538-4357/aa9123
A Search for Quasi-periodic Oscillations in the Blazar 1ES 1959+650
Multiband optical variability of three TeV blazars on diverse time-scales
Alok C. Gupta, A. Agarwal, J. Bhagwan, et al. Monthly Notices of the Royal Astronomical Society 458(1) 1127 (2016) https://doi.org/10.1093/mnras/stw377
Peak of spectral energy distribution plays an important role in intra-day variability of blazars?
Alok C. Gupta, Nibedita Kalita, Haritma Gaur and Kalpana Duorah Monthly Notices of the Royal Astronomical Society 462(2) 1508 (2016) https://doi.org/10.1093/mnras/stw1667
Multiband optical variability of the blazar S5 0716+714 in outburst state during 2014–2015
Aditi Agarwal, Alok C. Gupta, R. Bachev, et al. Monthly Notices of the Royal Astronomical Society 455(1) 680 (2016) https://doi.org/10.1093/mnras/stv2345
Flux and spectral variability of the blazar PKS 2155−304 with XMM–Newton: Evidence of particle acceleration and synchrotron cooling
Multiband optical–NIR variability of blazars on diverse time-scales
Aditi Agarwal, Alok C. Gupta, R. Bachev, et al. Monthly Notices of the Royal Astronomical Society 451(4) 3882 (2015) https://doi.org/10.1093/mnras/stv1208
Multiband variability in the blazar 3C 273 with XMM–Newton
Nibedita Kalita, Alok C. Gupta, Paul J. Wiita, Jai Bhagwan and Kalpana Duorah Monthly Notices of the Royal Astronomical Society 451(2) 1356 (2015) https://doi.org/10.1093/mnras/stv1027
Colour variation of the BL Lacertae object PKS 0537–441
Xiaopan Li, Li Zhang, Yuhui Luo, Lisha Wang and Li Zhou Monthly Notices of the Royal Astronomical Society 449(3) 2750 (2015) https://doi.org/10.1093/mnras/stv563
Junhui Fan, Jiang He Yang, Jing-Yi Zhang, Tong Xu Hua, Yi Liu, Yi-Ping Qin and Yong Huang Publications of the Astronomical Society of Japan 65(2) (2013) https://doi.org/10.1093/pasj/65.2.25
Optical intra-day variability timescales and black hole mass of the blazars
Spectral Index and Core-Dominance Parameter in Blazars
Jun-Hui Fan, Jiang-He Yang, Jun Tao, Yong Huang and Yi Liu Publications of the Astronomical Society of Japan 62(2) 211 (2010) https://doi.org/10.1093/pasj/62.2.211
Short-term flux and colour variations in low-energy peaked blazars
Radio Variability and Relativistic Beaming Effect for Blazars
Jun-Hui Fan, Yong Huang, Tang-Mei He, Jiang He Yang, Tong Xu Hua, Yi Liu and Yong Xiang Wang Publications of the Astronomical Society of Japan 61(4) 639 (2009) https://doi.org/10.1093/pasj/61.4.639
Radio Polarization Properties for Blazars
Jun-Hui Fan, Yu-Hai Yuan, Yi Liu, Tong-Xu Hua, Gustavo E. Romero, Yong-Wei Zhang, Jiang-Bo Su, Alok G. Gupta, Hua Liu, Yong Huang, Qian Guo, Jiang-Shui Zhang, Hong-Guang Wang, Jing-Yi Zhang and Jun Tao Publications of the Astronomical Society of Japan 60(4) 707 (2008) https://doi.org/10.1093/pasj/60.4.707
Multi-color optical variability of the TeV blazar Mrk 501 in the low-state
Simultaneous Multi-Wavelength Observations of the TeV Blazar Mrk 421 during February–March, 2003: X-Ray and NIR Correlated Variability
Alok C Gupta, B. S Acharya, Debanjan Bose, Varsha R Chitnis and Jun-Hui Fan Chinese Journal of Astronomy and Astrophysics 8(4) 395 (2008) https://doi.org/10.1088/1009-9271/8/4/03
Jun-Hui Fan, Tong-Xu Hua, Yu-Hai Yuan, Yong-Xiang Wang, Yi Liu, Jiang-Bo Su, Yong-Wei Zhang, Jiang-He Yang and Yong Huang Publications of the Astronomical Society of Japan 58(6) 945 (2006) https://doi.org/10.1093/pasj/58.6.945
Intra-night optical variability of luminous radio-quiet QSOs