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Detection of X-ray pulsations at the lowest observed luminosity of Be/X-ray binary pulsar EXO 2030+375 with AstroSat
Gaurava K. Jaisawal, Sachindra Naik, Shivangi Gupta +4
We present the results obtained from timing and spectral studies of Be/X-ray binary pulsar EXO 2030+375 using observations with the Large Area Xenon Proportional Counters and Soft…
The X-ray bursts of XTE J1739-285: a NICER sample
Peter Bult, Diego Altamirano, Zaven Arzoumanian +10
In this work we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739-285. We observed the source in 2020 F…
A Comprehensive X-ray Report on AT2019wey
Yuhan Yao, S. R. Kulkarni, K. C. Gendreau +25
Here, we present MAXI, SWIFT, NICER, NuSTAR and Chandra observations of the X-ray transient AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234). From spectral and timing analy…
Discovery of Thermonuclear Type-I X-ray Bursts from the X-ray binary MAXI J1807+132
A. C. Albayati, D. Altamirano, G. K. Jaisawal +13
MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburst in 2017. Observations during the 2017 outburst did not allow for an unambiguous identification of the na…
AstroSat Observations of the first Galactic ULX Pulsar Swift J0243.6+6124
Aru Beri, Sachindra Naik, K. P Singh +11
SwiftJ0243.6+6124, the first Galactic ultra-luminous X-ray pulsar, was observed during its 2017-2018 outburst with \emph{AstroSat} at both sub- and super-Eddington levels of accret…
Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
D. J. K. Buisson, D. Altamirano, P. Bult +22
Swift J1858.6-0814 is a recently discovered X-ray binary notable for extremely strong variability (by factors in soft X-rays) in its discovery state. We present the detectio…
NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0-1607: a Missing Link between Magnetars and Rotation Powered Pulsars
Chin-Ping Hu, Beste Begicarslan, Tolga Guver +13
We report on the hard X-ray burst and the first ~100 days NICER monitoring of the soft X-ray temporal and spectral evolution of the newly-discovered magnetar Swift J1818.0-1607. Th…
Proper motion, spectra, and timing of PSR J1813-1749 using Chandra and NICER
Wynn C. G. Ho, Sebastien Guillot, P. M. Saz Parkinson +7
PSR J1813-1749 is one of the most energetic rotation-powered pulsars known, producing a pulsar wind nebula (PWN) and gamma-ray and TeV emission, but whose spin period is only measu…
Revisiting the spectral and timing properties of 4U 1909+07 with NuSTAR and Astrosat
Gaurava K. Jaisawal, Sachindra Naik, Wynn C. G. Ho +3
We present the results obtained from the analysis of high mass X-ray binary pulsar 4U 1909+07 using NuSTAR and Astrosat observations in 2015 and 2017 July, respectively. X-ray puls…
Broadband X-ray Burst Spectroscopy of the FRB-Emitting Galactic Magnetar
G. Younes, M. G. Baring, C. Kouveliotou +22
Magnetars are young, magnetically-powered neutron stars possessing the strongest magnetic fields in the Universe. Fast Radio Bursts (FRBs) are extremely intense millisecond-long ra…
NICER-NuSTAR Observations of the Neutron Star Low-Mass X-ray Binary 4U 1735-44
R. M. Ludlam, E. M. Cackett, J. A. García +8
We report on the first simultaneous and observations of the neutron star (NS) low-mass X-ray binary 4U 173544, obtained in 2018 August. The source was at a lumi…
The 2019 super-Eddington outburst of RX J0209.6-7427: Detection of pulsations and constraints on the magnetic field strength
G. Vasilopoulos, P. S. Ray, K. C. Gendreau +10
In November 2019, MAXI detected an X-ray outburst from the known Be X-ray binary system RX J0209.6-7427 located in the outer wing of the Small Magellanic Cloud. We followed the out…
Timing of the accreting millisecond pulsar IGR J17591-2342: evidence of spin-down during accretion
A. Sanna, L. Burderi, K. C. Gendreau +8
We report on the phase-coherent timing analysis of the accreting millisecond X-ray pulsar IGR J17591-2342, using Neutron Star Interior Composition Explorer (NICER) data taken durin…