231 citations · 771 across the 16 of their papers we have counts for
16 papers
Fermi-GBM Observation of GRB 090717034: Test Confirms Evidence of Gravitational Lensing by a Supermassive Black Hole with Million Solar Mass
Zeinab Kalantari, Sohrab Rahvar, Alaa Ibrahim
Gravitational lensing of gamma-ray bursts (GRBs) can provide an opportunity to probe the massive compact objects in the universe at different redshifts. We have discovered two cons…
Imprints of Gravitational Millilensing on the Light Curve of GRBs
Zeinab Kalantari, Alaa Ibrahim, Mohammad Reza Rahimi Tabar +1
In this work, we search for signatures of gravitational millilensing in Gamma-ray bursts (GRB) in which the source-lens-observer geometry produces two images that manifest in the G…
The X-ray evolution and geometry of the 2018 outburst of XTE J1810-197
A. Borghese, N. Rea, R. Turolla +17
After 15 years, in late 2018, the magnetar XTE J1810-197 underwent a second recorded X-ray outburst event and reactivated as a radio pulsar. We initiated an X-ray monitoring campai…
A Minimal Timescale for the Continuum in 4U 1608-52 and Aql X-1
K. Mohamed, E. Sonbas, K. S. Dhuga +4
Similar to black-hole X-ray binary (BHXRB) transients, hysteresis-like state transitions are also seen in some neutron-star X-ray binaries (NSXRBs). Using a method based on wavelet…
The X-ray Spectrum Of The Black Hole Candidate Swift J1753.5-0127
Reham Mostafa, Mariano Mendez, Beike Hiemstra +4
We present a spectral analysis of the black hole candidate and X-ray transient source Swift J1753.5 0127 making use of simultaneous observations of XMM-Newton and Rossi X-ray Timin…
Discovery of Quasi-Periodic Oscillations in the Recurrent Burst Emission from SGR 1806-20
Ahmed M. El-Mezeini, Alaa I. Ibrahim
We present evidence for Quasi-Periodic Oscillations (QPOs) in the recurrent outburst emission from the soft gamma repeater SGR 1806-20 using NASA's Rossi X-ray Timing Explorer (RXT…