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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…
Multimission Observations of GS 1354-64 during the 2025-2026 Outburst: First Results
Dipak Debnath, Hsiang-Kuang Chang, Subham Srimani +1
The Galactic transient black hole GS 1354-64 recently showed a new outburst, which has been continuously monitored by {\it MAXI}, {\it NuSTAR} and {\it Insight-HXMT} missions. The…
Time-Lag properties associated with LFQPO in X-ray variability classes of GRS 1915+105: Findings from AstroSat
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
We present a comprehensive analysis of Low Frequency Quasi-periodic Oscillation (LFQPO) associated time-lags in the persistently variable black hole binary GRS 1915+105 using 441 k…
Possible detection of HFQPOs associated with 'unknown' variability class of GRS 1915+105
Seshadri Majumder, Santabrata Das, Anuj Nandi
We present a comprehensive spectro-temporal analysis of GRS observed with AstroSat during June, . A detailed study of the temporal properties reveals the appearanc…
Revisiting Disc-Jet Coupling in Black Hole X-ray Binaries: On the Nature of Disc Dynamics and Jet Velocity
Sreetama Das Choudhury, Bhuvana G. R., Santabrata Das +1
We perform a comprehensive wide-band (keV) spectro-temporal analysis of 13 outbursting BH-XRBs, using data (quasi)simultaneous with radio observations to unravel the complex…
Probing the accretion geometry of black hole X-ray binaries: A multi-mission spectro-polarimetric and timing study
Seshadri Majumder, Ankur Kushwaha, Swapnil Singh +3
We present a comprehensive spectro-polarimetric and timing analysis of twelve black hole X-ray binaries, namely Cyg X-1, 4U 1630-47, Cyg X-3, LMC X-1, 4U 1957+115, LMC X-3, Swift J…
Evidence of oscillating `compact' Comptonized corona in GRS 1915+105: Insights into HFQPOs with AstroSat
Sreehari Harikesh, Seshadri Majumder, Santabrata Das +1
We present, for the first time, an in-depth dynamical analysis of the spectro-temporal properties of the soft variability classes (, , , and ) of GRS 1915+105 during th…
Decoding the Origin of HFQPOs of GRS 1915+105 during 'Canonical' Soft States: An In-depth View using Multi-mission observations
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
We present a comprehensive analysis of the 'canonical' soft state (, , and spectral variability classes) of the black hole binary GRS 1915+105, using RXTE, AstroSat, and…
Long-term evolution of BH-ULX candidates: An `unusual' - correlation associated with spectral states
Seshadri Majumder, Santabrata Das, Anuj Nandi
We present the long-term spectral evolution of eight black hole ultra-luminous X-ray sources (BH-ULXs), namely NGC1313 X-1, NGC5408 X-1, NGC6946 X-1, IC342 X-1, NGC55 ULX1, NGC4395…
Accretion disc dynamics in extragalactic black hole X-ray binaries: A comprehensive study of M33 X-7, NGC 300 X-1 and IC 10 X-1
Bhuvana G. R., Anuj Nandi
Extragalactic Black Hole X-ray Binaries (BH-XRBs) are the most intriguing X-ray sources as some of them are `home' to the most massive stellar-mass BHs ever found. In this work, we…
Long term wide-band spectro-temporal studies of outbursting black hole candidate sources GX 339-4 and H 1743-322: AstroSat and NuSTAR results
U. Aneesha, Santabrata Das, Tilak B. Katoch +1
We present a comprehensive spectro-temporal analyses of recurrent outbursting black hole sources GX 3394 and H 1743322 using available AstroSat and NuSTAR archival observatio…
Discovery of evolving low-frequency QPOs in hard X-rays ( keV) observed in black hole Swift J1727.8-1613 with
Anuj Nandi, Santabrata Das, Seshadri Majumder +3
We report the first detection of evolving Low-Frequency Quasi-periodic Oscillation (LFQPO) frequencies in hard X-rays upto keV with during `unusual' outburst…
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…
First detection of X-ray polarization in Galactic ULX pulsar Swift J0243.66124 with {\it IXPE}
Seshadri Majumder, Rwitika Chatterjee, Kiran M. Jayasury +2
We report the results of first ever spectro-polarimetric analyses of the Galactic ultra-luminous X-ray pulsar Swift J0243.6 during the 2023 outburst using quasi-simultaneous…
First detection of Soft-lag in GRS 1915+105 at HFQPO using AstroSat observations
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
The Galactic black hole GRS 1915+105 exhibits generic High-Frequency Quasi-periodic Oscillations (HFQPOs) at 67 Hz only during the radio-quiet 'softer' variability classes.…
First detection of X-ray polarization in thermal state of LMC X-3: Spectro-polarimetric study with IXPE
Seshadri Majumder, Ankur Kushwaha, Santabrata Das +1
We report a comprehensive spectro-polarimetric study of the black hole binary LMC X using simultaneous {\it IXPE}, {\it NICER} and {\it NuSTAR} observations in 0.520 keV ene…
Spectro-polarimetry of 4U 1957+115 with IXPE: Effects of spin and returning radiation on polarised emission of black hole in thermal state
Ankur Kushwaha, Kiran M. Jayasurya, Anuj Nandi
We present a comprehensive spectro-polarimetric study of persistent Black hole X-ray binary 4U with {\it IXPE} and {\it NICER} observations. The source is observed i…
Unveiling the accretion scenario of BH-ULXs using XMM-Newton observations
Seshadri Majumder, Santabrata Das, Vivek. K. Agrawal +1
We present a comprehensive spectro-temporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival {\it XMM-Newton} obser…
Wideband Study of the Brightest Black Hole X-ray Binary 4U 1543-47 in the 2021 Outburst: Signature of Disk-Wind Regulated Accretion
Geethu Prabhakar, Samir Mandal, Bhuvana G. R. +1
A comprehensive wideband spectral analysis of the brightest black hole X-ray binary 4U during its 2021 outburst is carried out for the first time using NICER, NuSTAR, and…
Spectro-temporal evolution during the onset-phase of the 2011 outburst of IGR J17091-3624. Implications on accretion disk dynamics
Nirmal Iyer, A. Nandi
We re-analysed the archival data of RXTE / INTEGRAL / Swift satellites at the onset phase of the 2011 outburst of the X-ray source IGR J17091-3624. The evolution of the spectral an…
Disk-Jet connection in outbursting Black Hole sources
D. Radhika, A. Nandi, S. Seetha
We explored the `spectro - temporal' behaviour of outbursting Black Hole sources in X-rays, at the time of jet ejections which are observed as radio flares. The energy dependent ev…