7 papers
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…
Evolution of Time-Lags of Swift J1727.8-1613 during the Rising Phase of Its Discovery Outburst
Sujoy Kumar Nath, Dipak Debnath, Hsiang-Kuang Chang
We investigate the accretion dynamics of the black hole X-ray binary Swift J1727.8-1613 during its discovery outburst that lasted for months. Insight-HXMT moni…
Accretion Flow Properties of MAXI J1834-021 During Its Double-Outbursts In 2023
Dipak Debnath, Hsiang-Kuang Chang
The Galactic transient black hole candidate MAXI J1834-021 exhibited `faint' outbursting activity for approximately months following its discovery on February 5, 2023. We stud…
Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass
Dipak Debnath, Hsiang-Kuang Chang, Sujoy Kumar Nath +1
The rising phase of the 2023-24 outburst of the recently discovered bright transient black hole candidate Swift J1727.8-1613 was monitored by {\it Insight}-HXMT. We study the evolu…
Detection of X-ray Polarization in the Hard State of IGR J17091-3624: Spectro-Polarimetric Study with IXPE and NuSTAR Data
Dipak Debnath, Subham Srimani, Hsiang-Kuang Chang
The class-transition Galactic X-ray binary IGR~J17091--3624 was simultaneously monitored by the \textit{IXPE} and \textit{NuSTAR} satellites. We present a detailed spectro-polarime…
Investigating the Anti-Correlation between Photon Index and Flux of the Crab using RXTE and NuSTAR
Debjit Chatterjee, Hsiang-Kuang Chang, Dipak Debnath +2
We present a systematic study of the recently reported anti-correlation between X-ray flux and photon index () in the Crab Nebula, using archival RXTE/PCA (3 - 50 keV), RXTE/HE…