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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…
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/HEX…
Evolution of QPO During Discovery Outburst of MAXI J1834-021: Estimation of Intrinsic Parameters from Spectro-Temporal Study
Dipak Debnath, Hsiang-Kuang Chang
The Galactic transient black hole candidate (BHC) MAXI~J1834-021 was detected for the first time by MAXI/GSC on February 05, 2023 and it was active for next ~months. A mon…
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…
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…