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An evolving broad iron line from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
Gaurava K. Jaisawal, Colleen A. Wilson-Hodge, Andrew C. Fabian +15
We present a spectral study of the ultraluminous Be/X-ray transient pulsar Swift J0243.6+6124 using Neutron Star Interior Composition Explorer (NICER) observations during the syste…
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow
M. Ajello, M. Arimoto, M. Axelsson +147
We report on the observations of gamma-ray burst (GRB) 190114C by the Fermi Gamma-ray Space Telescope and the Neil Gehrels Swift Observatory. The early-time observations reveal mul…
Evaluation of Automated Fermi GBM Localizations of Gamma-ray Bursts
Adam Goldstein, Corinne Fletcher, Peter Veres +14
The capability of the Fermi Gamma-ray Burst Monitor (GBM) to localize gamma-ray bursts (GRBs) is evaluated for two different automated algorithms: the GBM Team's RoboBA algorithm a…
BurstCube: Concept, Performance, and Status
Jacob R. Smith, Michael S. Briggs, Alessandro Bruno +26
The first simultaneous detection of a short gamma-ray burst (SGRB) with a gravitational-wave (GW) signal ushered in a new era of multi-messenger astronomy. In order to increase the…
All-sky Medium Energy Gamma-ray Observatory: Exploring the Extreme Multimessenger Universe
Julie McEnery, Juan Abel Barrio, Ivan Agudo +182
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s…
Spectral and Timing Analysis of the accretion-powered pulsar 4U 1626-67 observed with Suzaku and NuSTAR
Wataru B. Iwakiri, Katja Pottschmidt, Sebastian Falkner +13
We present an analysis of the spectral shape and pulse profile of the accretion-powered pulsar 4U 1626-67 observed with Suzaku and NuSTAR during a spin-up state. The pulsar, which…
Astro2020 Science White Paper: A Summary of Multimessenger Science with Galactic Binaries
Thomas Kupfer, Mukremin Kilic, Tom Maccarone +3
Galactic binaries with orbital periods less than 1 hr are strong gravitational wave sources in the mHz regime, ideal for the Laser Interferometer Space Antenna (LISA). In…
The Physics of Accretion Onto Highly Magnetized Neutron Stars
Michael T. Wolff, Peter A. Becker, Joel Coley +16
Studying the physical processes occurring in the region just above the magnetic poles of strongly magnetized, accreting binary neutron stars is essential to our understanding of st…
Determining the Equation of State of Cold, Dense Matter with X-ray Observations of Neutron Stars
Slavko Bogdanov, Anna L. Watts, Deepto Chakrabarty +9
The unknown state of matter at ultra-high density, large proton/neutron number asymmetry, and low temperature is a major long-standing problem in modern physics. Neutron stars prov…
Gamma Rays and Gravitational Waves
E. Burns, S. Zhu, C. M. Hui +28
The first multimessenger observation of a neutron star merger was independently detected in gamma-rays by Fermi-GBM and INTEGRAL SPI-ACS and gravitational waves by Advanced LIGO an…
Opportunities for Multimessenger Astronomy in the 2020s
E. Burns, A. Tohuvavohu, J. M. Bellovary +22
Electromagnetic observations of the sky have been the basis for our study of the Universe for millennia, cosmic ray studies are now entering their second century, the first neutrin…
A Summary of Multimessenger Science with Neutron Star Mergers
Eric Burns, Aaron Tohuvavohu, James Buckley +17
Neutron star mergers, referring to both binary neutron star and neutron star black hole mergers, are the canonical multimessenger events. They have been detected across the electro…
Updates to the Fermi GBM Targeted Sub-threshold Search in Preparation for the Third Observing Run of LIGO/Virgo
Adam Goldstein, Rachel Hamburg, Joshua Wood +11
In this document, we detail the improvements made to the Fermi GBM targeted sub-threshold search for counterparts to LIGO/Virgo gravitational-wave triggers. We describe the impleme…
Fermi GBM GRBs with characteristics similar to GRB 170817A
A. von Kienlin, P. Veres, O. J. Roberts +11
We present a search for gamma-ray bursts in the Fermi-GBM 10 year catalog that show similar characteristics to GRB 170817A, the first electromagnetic counterpart to a GRB identifie…