Type-C quasi-periodic oscillations (QPOs) in black hole X-ray transients can appear when
the source is in the low-hard and hard-intermediate states. The spectral-timing evolution of …

We study the properties of the type-C quasi-periodic oscillation (type-C QPO) of MAXI J1348–
630 during its 2019 outburst and reflare with NICER. This is the first time that the evolution of …

We report the evolution of the X-ray pulsations of EXO 2030+ 375 during its 2021 outburst
using the observations from Insight-HXMT. Based on the accretion torque model, we study …

The fast transitions between different types of quasi-periodic oscillations (QPOs) are
generally observed in black hole transient sources (BHTs). We present a detailed study of …

We report the first detection of evolving Low-Frequency Quasi-periodic Oscillation (LFQPO)
frequencies in hard X-rays upto 100 keV with AstroSat/LAXPC during 'unusual'outburst …

Fast transitions between different types of power density spectra (PDS) happening over time-
scales of several tens of seconds are rare phenomena in black hole X-ray binaries. In this …

The study of quasi-periodic oscillations (QPOs) plays a vital role in understanding the nature
and geometry of the Comptonizing medium around black hole X-ray binaries. The spectral …

We present the timing analysis results of MAXI J1803− 298, a black hole candidate, during
its 2021 outburst using data obtained from the Insight–Hard X-ray Modulation Telescope …

We perform comprehensive temporal and spectral analysis of the newly discovered X-ray
transient MAXI J1803–298 using an AstroSat target of opportunity observation on 2021 May …

Here we report the spectral-timing results of the black hole X-ray binary 4U 1630–47 during
its 2021 outburst using observations from the Hard X-ray Modulation Telescope (Insight …