12 citations · 23 across the 17 of their papers we have counts for
17 papers
Importance and Science Outcomes from the first XSPECT/XPoSat Workshop
Anuj Nandi, Rwitika Chatterjee, V. P. Shyam Prakash +49
This paper summarizes the science outcomes of the first Workshop on Data Analysis using observations from the XSPECT payload onboard the XPoSat, which brought together early-career…
Tracing the outburst decay of soft X-ray transients Aql X-1 and 4U 1608-52 with XSPECT
Rwitika Chatterjee, Vivek Kumar Agrawal, V. P. Shyam Prakash +2
XSPECT instrument on-board XPoSat mission is a soft X-ray spectrometer sensitive in the energy band 0.815 keV. XSPECT has observed several bright neutron star low mass X-ray bin…
X-ray spectral and temporal evolution of atoll source 4U 1820-30 with AstroSat: detection of high frequency quasi-periodic oscillation
Subhasish Das, Vivek Kumar Agrawal, Parijat Thakur +4
AstroSat/LAXPC and SXT observed the persistent neutron star low-mass X-ray binary 4U 1820-30 between 2016 and 2022. During these observations, the hardness-intensity diagram (HID)…
X-ray Timing and Spectral studies of the bare AGN Mrk 110
Deblina Lahiri, K. Sriram, Vivek Kumar Agrawal
The origin of the soft X-ray excess below 2 keV in active galactic nuclei (AGNs) remains debated, with relativistic reflection from the inner accretion disk and warm Comptonization…
Accretion Geometry of the New Galactic Black Hole Candidate AT2019wey in the Hard State
Pragati Sahu, Swadesh Chand, Gulab C. Dewangan +3
We perform broadband spectral and timing studies of the Galactic low-mass black hole candidate AT2019wey using quasi-simultaneous NICER, Swift, and NuSTAR observations obtained in…
Spectral nature of Sco X-1 observed using the X-ray SPECtroscopy and Timing (XSPECT) payload on-board XPoSat
V. P. Shyam Prakash, Vivek K. Agrawal, Rwitika Chatterjee +3
Scorpius X-1 is the brightest and first discovered X-ray source in the sky. Studying this source in the low-energy band has been challenging in the past due to its high brightness.…
XSPECT on-board XPoSat: Calibration and First Results
Rwitika Chatterjee, Koushal Vadodariya, Radhakrishna Vatedka +6
XPoSat is India's first X-ray spectro-polarimetry mission, consisting of two co-aligned instruments, a polarimeter (POLIX) and a spectrometer (XSPECT), to study the X-ray emission…
X-Ray spectroscopy and timing (XSPECT) experiment on XPoSat -- instrument configuration and science prospects
Radhakrishna V, Anurag Tyagi, Koushal Vadodariya +11
X-ray Polarimeter Satellite (XPoSat) with POLarimeter Instrument in X-rays (POLIX), is India's first spacecraft dedicated to study medium energy X-ray polarisation from celestial o…
First spectro-polarimetric study of the neutron star low-mass X-ray binary GX 9+1
V. P. Shyam Prakash, Vivek K. Agrawal, A. M. Vinodkumar
We present the first spectro-polarimetric study of the bright atoll source GX 9+1, using the simultaneous Imaging X-ray Polarimetry Explorer (IXPE), and Neutron star Interior Compo…
Simultaneous X-ray and optical polarization observations of the blazar Mrk 421
Athira M. Bharathan, C. S. Stalin, S. Sahayanathan +7
We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The X-ray polarimetric observations were carried out u…
Astrosat view of GX 339-4 during the peak of the recent outburst
Shyam Prakash V. P., Ramadevi M. C., Vivek K. Agrawal
We present the spectral and timing analyses of \textit{AstroSat} observations of the Black Hole X-ray Binary GX 339-4 when the source was close the peak of the outburst in 2024. We…
AstroSat View of the Neutron Star Low-mass X-Ray Binary GX 5-1
Shyam Prakash V P, Vivek K. Agrawal
We present the spectral and timing study of the bright NS-LMXB GX 5-1 using \textit{\textit{AstroSat}/LAXPC} and \textit{SXT} observations conducted in the year 2018. During the ob…
Spectro-polarimetric study to constrain accretion-ejection properties of MCG-5-23-16 using IXPE and NuSTAR observations
Santanu Mondal, Rwitika Chatterjee, Vivek K. Agrawal +1
We conducted a study on the X-ray polarization properties of MCG-5-23-16 by analyzing long-term monitoring data from {\it NuSTAR} jointly with {\it IXPE} observations made in May a…
AstroSat View of Transient Low-mass X-ray Binary XTE J1701-462: Spectral and Temporal Evolution along the Z-track
Vivek K. Agrawal
AstroSat observed transient neutron star low-mass X-ray binary XTE J1701-462 for a total duration of 135 ks during its 2022 outburst. The source traced a complete `Z' shaped…
Detection of X-ray Polarization in the High Synchrotron Peaked Blazar 1ES 1959+650
Athira M. Bharathan, C. S. Stalin, Rwitika Chatterjee +4
We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochsof observations from the {\it Imaging X-ray Polarimetry Explor…
X-ray polarization observations of IC 4329A with IXPE: Constraining the geometry of the X-ray corona
Indrani Pal, C. S. Stalin, Rwitika Chatterjee +1
X-ray polarimetry is a powerful tool to probe the geometry of the hot X-ray corona in active galactic nuclei (AGN). Here, we present our results on the characterisation of the X-ra…
A truncated accretion disk in the galactic black hole source H1743-322
K. Sriram, V. K. Agrawal, A. R. Rao
To investigate the geometry of the accretion disk in the source H1743-322, we have carried out a detailed X-ray temporal and spectral study using RXTE pointed observations. We have…