61 citations · 224 across the 11 of their papers we have counts for
11 papers
Understanding the X-ray spectral curvature of Mkn 421 using broadband AstroSat observations
Jyotishree Hota, Zahir Shah, Rukaiya Khatoon +3
We present a time-resolved X-ray spectral study of the high energy peaked blazar Mkn 421 using simultaneous broadband observations from the LAXPC and SXT instruments on-board Astro…
The long-term X-ray flux distribution of Cygnus X-1 using RXTE-ASM and MAXI observations
Kabita Deka, Zahir Shah, Ranjeev Misra +1
We studied the long term flux distribution of Cygnus X-1 using RXTE-ASM lightcurves in two energy bands B (3-5 keV) & C (5-12.1 keV) as well as MAXI lightcurves in energy bands B (…
AstroSat observation of the HBL 1ES 1959+650 during its October 2017 flaring
Zahir Shah, Savithri H. Ezhikode, Ranjeev Misra +1
We present the results of the X-ray flaring activity of 1ES 1959+650 during October 25-26, 2017 using AstroSat observations. The source was variable in the X-ray. We investigated t…
Correlation between optical and -ray flux variations in BL Lacs
Bhoomika Rajput, Zahir Shah, C. S. Stalin +2
We report here results on the analysis of correlated flux variations between the optical and GeV -ray bands in three bright BL Lac objects, namely AO\, 0235+164, OJ 287 and PKS…
Temporal and spectral study of PKS 0208-512 during the 2019-2020 flare
Rukaiya Khatoon, Raj Prince, Zahir Shah +2
We present the temporal and spectral study of blazar PKS 0208-512, using recent flaring activity from November 2019 to May 2020, as detected by the Fermi-LAT observatory. The conte…
Unveiling the broadband spectral and temporal properties of PKS\,0903-57 during its brightest flare
Zahir Shah, V. Jithesh, S. Sahayanathan +1
We carried a detailed spectral and temporal study of blazar, \mbox{PKS\,0903-57} using the \emph{Fermi}-LAT and \emph{Swift}-XRT/UVOT observations, during its brightest flaring per…
On the determination of log-normal flux distributions for astrophysical systems
Zahir Shah, Ranjeev Misra, Atreyee Sinha
Determining whether the flux distribution of an Astrophysical source is a Gaussian or a log-normal, provides key insight into the nature of its variability. For lightcurves of mode…
Study of long-term flux and photon Index distributions of blazars using RXTE observations
Rukaiya Khatoon, Zahir Shah, Ranjeev Misra +1
We present a detailed study of flux and index distributions of three blazars (one FSRQ and two BL Lacs) by using 16 years of Rossi X-ray Timing Explorer archival data. The three bl…
Study on Temporal and Spectral behavior of 3C 279 during 2018 January flare
Zahir Shah, V. Jithesh, S. Sahayanathan +2
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.…
Log-normal flux distribution of bright Fermi blazars
Zahir Shah, N. Mankuzhiyil, A. Sinha +3
We present the results of the -ray flux distribution study on the brightest blazars which are observed by the \emph{Fermi}-LAT. We selected 50 brightest blazars based on the max…
Clues on High Energy Emission Mechanism from Blazar 3C 454.3 during 2015 August Flare
Zahir Shah, S. Sahayanathan, Nijil Mankuzhiyil +3
We perform a detailed spectral study of a recent flaring activity from the Flat Spectrum Radio Quasar (FSRQ), 3C\,454.3, observed simultaneously in optical, UV, X-ray and -ray e…