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17 papers · 2 filters
Persistent Emission Properties of SGR J1935+2154 During Its 2020 Active Episode
Ersin Gogus, Matthew G. Baring, Chryssa Kouveliotou +6
We present detailed spectral and temporal characteristics of the persistent X-ray emission of SGR J1935+2154 based on our XMM-Newton and Chandra observations taken in the aftermath…
PSR J1709-4429's Proper Motion and its Relationship to SNR G343.1-2.3
Martijn de Vries, Roger W. Romani, Oleg Kargaltsev +6
We have obtained a deep 670 ks CXO ACIS image of the remarkable pulsar wind nebula (PWN) of PSR J1709-4429, in 4 epochs during 2018-2019. Comparison with an archival 2004 data set…
A Minimal Time Scale for the Spectral States of GX 339-4
E. Sonbas, K. Mohamed, K. S. Dhuga +2
Black hole transients are known to undergo spectral transitions that form q-shaped tracks on a hardness intensity diagram. In this work, we use archival RXTE data to extract a char…
GRB Spectrum from Gradual Dissipation in a Magnetized Outflow
Ramandeep Gill, Jonathan Granot, Paz Beniamini
Modeling of gamma-ray burst (GRB) prompt emission spectra sometimes requires a (quasi-) thermal spectral component in addition to the Band function. In photospheric emission models…
Discovery of the optical afterglow and host galaxy of short GRB181123B at : Implications for Delay Time Distributions
K. Paterson, W. Fong, A. Nugent +19
We present the discovery of the optical afterglow and host galaxy of the {\it Swift} short-duration gamma-ray burst, GRB\,181123B. Observations with Gemini-North starting at $\appr…
A radiatively-quiet glitch and anti-glitch in the magnetar 1E 2259+586
G. Younes, P. S. Ray, M. G. Baring +5
We report on the timing and spectral properties of the soft X-ray emission from the magnetar 1E 2259+586 from January 2013, months after the detection of an anti-glitch, u…