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Evidence for a Compact Object in the Aftermath of the Extra-Galactic Transient AT2018cow
Dheeraj R. Pasham, Wynn C. G. Ho, William Alston +16
The brightest Fast Blue Optical Transients (FBOTs) are mysterious extragalactic explosions that may represent a new class of astrophysical phenomena. Their fast time to maximum bri…
A NICER look at thermonuclear X-ray bursts from Aql X-1
Tolga Guver, Tugba Boztepe, David R. Ballantyne +8
We present spectral and temporal properties of all the thermonuclear X-ray bursts observed from Aql X-1 by the Neutron Star Interior and Composition Explorer (NICER) between 2017 J…
A month of monitoring the new magnetar Swift J1555.2-5402 during an X-ray outburst
Teruaki Enoto, Mason Ng, Chin-ping Hu +23
The soft gamma-ray repeater Swift J1555.2-5402 was discovered by means of a 12-ms duration short burst detected with Swift BAT on 2021 June 3. Then 1.6 hours after the first burst…
On the impact of an intermediate duration X-ray burst on the accretion environment in IGR J17062-6143
Peter Bult, Diego Altamirano, Zaven Arzoumanian +10
We report on a spectroscopic analysis of the X-ray emission from IGR J17062-6143 in the aftermath of its June 2020 intermediate duration Type I X-ray burst. Using the Neutron Star…
NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348-630
L. Zhang, D. Altamirano, P. Uttley +13
We present a systematic spectral-timing analysis of a fast appearance/disappearance of a type-B quasi-periodic oscillation (QPO), observed in four NICER observations of MAXI J1348-…
Constraining the Neutron Star Mass--Radius Relation and Dense Matter Equation of State with NICER. III. Model Description and Verification of Parameter Estimation Codes
Slavko Bogdanov, Alexander J. Dittmann, Wynn C. G. Ho +16
We describe the X-ray pulse profile models we use, and how we use them, to analyze Neutron Star Interior Composition Explorer (NICER) observations of rotation-powered millisecond p…