Explanipedia

The 2025 outburst of IGR J17511−3057: Timing and spectral insights from NICER and NuSTAR Open

A. Sanna, G. K. Jaisawal, T. E. Strohmayer, Giulia Illiano, A. Riggio , et al. · 2025

Context. IGR J17511−3057 is an accreting millisecond X-ray pulsar and a known type-I burster. The source was observed in outburst for the first time in 2009 and again in 2015, followed by a decade-long quiescence phase. Aims. The source wa…

First X-ray and radio polarimetry of the neutron star low-mass X-ray binary GX 17+2 Open

Unnati Kashyap, Thomas J. Maccarone, Eliot C. Pattie, Mason Ng, Swati Ravi , et al. · 2025

We report the first polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 17+2 using the Imaging X-ray Polarimetry Explorer (IXPE) and the Very Large Array (VLA). We find that the X-ray source was polarized…

X-Ray and Radio Polarimetry of the Neutron Star Low-mass X-Ray Binary GX 13+1 Open

Unnati Kashyap, Thomas J. Maccarone, Eliot C. Pattie, Mason Ng, Swati Ravi , et al. · 2025

We report the X-ray and radio polarization study of the neutron star low-mass X-ray binary (LMXB) GX 13+1 using the Imaging X-ray Polarimetry Explorer (IXPE) and Very Large Array. Simultaneous Neutron Star Interior Composition Explorer obs…

The 2020 superburst of 4U 1608–522 and its impact on the accretion disc Open

Tuğba Boztepe, Tolga Güver, Elif Ece Devecioğlu, J. Speicher, Motoko Serino , et al. · 2025

Superbursts are rare events observed from bursting neutron star low-mass X-ray binaries. They are thought to originate from unstable burning of the thick layer of Carbon on the surface of the neutron star, causing the observed X-ray flashe…

What's the Buzz About GX 13+1? Constraining Coronal Geometry with QUEEN-BEE: A Bayesian Nested Sampling Framework for X-ray Polarization Rotation Analysis Open

Swati Ravi, Mason Ng, Herman L. Marshall, Andrea Gnarini · 2025

Observations from the Imaging X-ray Polarimetry Explorer (IXPE) have revealed electric vector position angle (EVPA) rotation in several neutron star low-mass X-ray binaries, including the galactic X-ray burster GX 13+1. We developed a nove…

A Spatial Gap in the Sky Distribution of Fast Radio Burst Detections Coinciding with Galactic Plasma Overdensities Open

Swarali Shivraj Patil, Robert Main, Emmanuel Fonseca, Kyle McGregor, B. M. Gaensler , et al. · 2025

We analyze the positional and morphological properties of about 3600 unique fast radio burst (FRB) sources reported in the second FRB catalog generated by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. We find a two-…

FRB 20250316A: A Brilliant and Nearby One-off Fast Radio Burst Localized to 13 pc Precision Open

Thomas C. Abbott, Daniel Amouyal, Bridget C. Andersen, Shion Andrew, Kevin Bandura , et al. · 2025

Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations revealing diverse local environments. However, the 2%–3% of FR…

X-ray and radio polarimetry of the neutron star low mass X-ray binary GX 13+1 Open

Unnati Kashyap, Thomas J. Maccarone, Eliot C. Pattie, Mason Ng, Swati Ravi , et al. · 2025

We report the X-ray and radio polarization study of the neutron star (NS) low-mass X-ray binary (LMXB) GX 13+1 using the Imaging X-ray Polarimetry Explorer (IXPE) and Very Large Array (VLA). Simultaneous Neutron Star Interior Composition E…

Timing and Spectral Evolution of the Magnetar 1E 1841-045 in Outburst Open

George Younes, S. K. Lander, Matthew G. Baring, Marlon L. Bause, R. J. Stewart , et al. · 2025

We present timing and spectral analyses of Neutron star Interior Composition Explorer (NICER), Nuclear Spectroscopic Telescope Array (NuSTAR), and IXPE observations of the magnetar 1E 1841−045 covering 82 days following its 2024 August bur…

CHIME/Fast Radio Burst Discovery of an Unusual Circularly Polarized Long-period Radio Transient with an Accelerating Spin Period Open

Fengqiu Adam Dong, Kaitlyn Shin, Casey Law, Mason Ng, I. H. Stairs , et al. · 2025

We report the discovery of CHIME J1634+44, a long-period radio transient (LPT) unique for two aspects: it is the first known LPT to emit fully circularly polarized radio bursts, and it is the first LPT with a significant spin-up. Given tha…

A Gravitational-wave-detectable Candidate Type Ia Supernova Progenitor Open

Emma Chickles, Kevin B. Burdge, Joheen Chakraborty, V. S. Dhillon, Paul A. Draghis , et al. · 2025

Type Ia supernovae (SNe Ia), critical for studying cosmic expansion, arise from thermonuclear explosions of white dwarfs, but their precise progenitor pathways remain unclear. Growing evidence supports the “double-degenerate scenario,” whe…

FRB 20250316A: A Brilliant and Nearby One-Off Fast Radio Burst Localized to 13 parsec Precision Open

FRB Collaboration, Thomas C. Abbott, Daniel Amouyal, Shion Andrew, Kevin Bandura , et al. · 2025

Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations revealing diverse local environments. However, the 2--3\% of F…

X-Ray Polarization Study of the Neutron Star Low-mass X-Ray Binary GX 349+2 Open

Unnati Kashyap, Thomas J. Maccarone, Mason Ng, Eliot C. Pattie, Swati Ravi , et al. · 2025

We report the first X-ray polarimetric results of the neutron star (NS) low-mass X-ray binary Z-source GX 349+2 using the Imaging X-ray Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized at a polarization degree…

Discovery and Localization of the Swift-Observed FRB 20241228A in a Star-forming Host Galaxy Open

Alice P. Curtin, Shion Andrew, Sunil Simha, Alice Cai, Kenzie Nimmo , et al. · 2025

On 2024 December 28, CHIME/FRB detected the thus-far non-repeating FRB 20241228A with a real-time signal-to-noise ratio of $>50$. Approximately 112~s later, the X-ray Telescope onboard the Neil Gehrels Swift Observatory was on source, the …

X-Ray and Radio Polarimetry of the Neutron Star Low-mass X-Ray Binary 4U 1728–34 Open

Unnati Kashyap, Thomas J. Maccarone, T. D. Russell, Mason Ng, Swati Ravi , et al. · 2025

We report the first X-ray and radio polarimetric results of the neutron star (NS) low-mass X-raydis binary atoll-source 4U 1728−34 using the Imaging X-ray Polarimetry Explorer (IXPE) and Australia Telescope Compact Array. We discovered tha…

X-Ray Polarization of the Magnetar 1E 1841−045 Open

R. J. Stewart, George Younes, A. K. Harding, Zorawar Wadiasingh, Matthew G. Baring , et al. · 2025

We report on IXPE and NuSTAR observations beginning 40 days after the 2024 outburst onset of magnetar 1E 1841−045, marking the first IXPE observation of a magnetar in an enhanced state. Our spectropolarimetric analysis indicates that both …

The CHIME/FRB Discovery of the Extremely Active Fast Radio Burst Source FRB 20240114A Open

Kaitlyn Shin, Alice P. Curtin, Maxwell Fine, Ayush Pandhi, Shion Andrew , et al. · 2025

Among the thousands of observed fast radio bursts (FRBs), a few sources exhibit exceptionally high burst activity observable by many telescopes across a broad range of radio frequencies. Almost all of these highly active repeaters have bee…

X-ray polarization study of the neutron star low-mass X-ray binary GX 349+2 Open

Unnati Kashyap, Thomas J. Maccarone, Mason Ng, Eliot C. Pattie, Swati Ravi , et al. · 2025

We report the first X-ray polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 349+2 using the Imaging X-ray Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized at PD = 1.1 +/- 0…

Exploring polarization and geometry in the X-ray pulsar 4U 1538−52 Open

Vladislav Loktev, Sofia V. Forsblom, Sergey S. Tsygankov, Juri Poutanen, Alexander A. Mushtukov , et al. · 2025

The Imaging X-ray Polarimetry Explorer (IXPE) observations of accreting X-ray pulsars (XRPs) continue to provide novel insights into the physics and geometry of these sources. We present the first X-ray polarimetric study of the persistent…

X-ray spectro-polarimetry analysis of the weakly magnetized neutron star X-ray binary GX 9+1 Open

A. Tarana, Fiamma Capitanio, Andrea Gnarini, Sergio Fabiani, F. Ursini , et al. · 2025

We present an X-ray spectro-polarimetric study of the weakly magnetized neutron star low-mass X-ray binary GX 9+1, utilizing data from the Imaging X-ray Polarimetry Explorer (IXPE), alongside simultaneous NuSTAR, NICER, and INTEGRAL observ…

Parameter constraints for accreting millisecond pulsars with synthetic NICER data Open

Bas Dorsman, Tuomo Salmi, Anna L. Watts, Mason Ng, Satish Kamath , et al. · 2025

Pulse profile modelling (PPM) is a technique for inferring mass, radius, and hotspot properties of millisecond pulsars. PPM is now regularly used for the analysis of rotation-powered millisecond pulsars with data from the Neutron Star Inte…

Timing and Spectral Evolution of the Magnetar 1E 1841-045 in Outburst Open

George Younes, S. K. Lander, M. G. Baring, M. L. Bause, Ross Stewart , et al. · 2025

We present the timing and spectral analyses of the NICER, NuSTAR, and IXPE observations of the magnetar 1E 1841-045 covering 82 days following its August 2024 bursting activity as well as radio observations utilizing MeerKAT and Effelsberg…

Einstein Probe Discovery of EP J005245.1−722843: A Rare Be–White Dwarf Binary in the Small Magellanic Cloud? Open

A. Marino, Haonan Yang, F. Coti Zelati, N. Rea, Sébastien Guillot , et al. · 2025

On 2024 May 27, the Wide-field X-ray Telescope on board the Space Sciences, University of Chinese Academy of Einstein Probe (EP) mission detected enhanced X-ray emission from a new transient source in the Small Magellanic Cloud during its …

NICER observations of type-I X-ray bursts from the ultra-compact X-ray binary M15 X-2 Open

María Alejandra Díaz Teodori, J. J. E. Kajava, C. Sánchez‐Fernández, A. Sanna, Mason Ng , et al. · 2025

Type-I X-ray bursts are thermonuclear explosions caused by the unstable burning of accreted material on the surface of neutron stars. We report the detection of seven type-I X-ray bursts from the ultracompact X-ray binary M15 X-2 observed …

Characterization of a Peculiar Einstein Probe Transient EP240408a: An Exotic Gamma-Ray Burst or an Abnormal Jetted Tidal Disruption Event? Open

Brendan O’Connor, Dheeraj R. Pasham, Igor Andreoni, Jeremy Hare, Paz Beniamini , et al. · 2025

We present the results of our multiwavelength (X-ray to radio) follow-up campaign of the Einstein Probe transient EP240408a. The initial 10 s trigger displayed bright soft X-ray (0.5–4 keV) radiation with peak luminosity L X ≳ 10 49 (10 50…

Discovery of polarized X-ray emission from the accreting millisecond pulsar SRGA J144459.2–604207 Open

Alessandro Papitto, Alessandro Di Marco, Juri Poutanen, Tuomo Salmi, Giulia Illiano , et al. · 2025

We report the discovery of polarized X-ray emission from an accreting millisecond pulsar. During a 10-day-long coverage of the February 2024 outburst of SRGA J144459.2−604207, the Imaging X-ray Polarimetry Explorer (IXPE) detected an avera…

X-ray polarization of the magnetar 1E 1841-045 Open

R. J. Stewart, George Younes, A. K. Harding, Zorawar Wadiasingh, Matthew G. Baring , et al. · 2024

We report on IXPE and NuSTAR observations beginning forty days after the 2024 outburst onset of magnetar 1E 1841-045, marking the first IXPE observation of a magnetar in an enhanced state. Our spectropolarimetric analysis indicates that bo…

A gravitational wave detectable candidate Type Ia supernova progenitor Open

Emma Chickles, Kevin B. Burdge, Joheen Chakraborty, V. S. Dhillon, Paul A. Draghis , et al. · 2024

Type Ia supernovae, critical for studying cosmic expansion, arise from thermonuclear explosions of white dwarfs, but their precise progenitor pathways remain unclear. Growing evidence supports the ``double-degenerate'' scenario, where two …

Tentative Blazar Candidate EP240709A Associated with 4FGL J0031.5−5648: NICER and Archival Multiwavelength Observations Open

Mason Ng, Jeremy Hare, Gaurava K. Jaisawal, Christian Malacaria, C. B. Markwardt , et al. · 2024

We report on follow-up observations of the recently discovered transient by the Einstein Probe, EP240709A, with the Neutron star Interior Composition Explorer. We also incorporated archival multiwavelength survey data from the Neil Gehrels…

First spectropolarimetric observation of the neutron star low-mass X-ray binary GX 3+1 Open

Andrea Gnarini, R. Farinelli, F. Ursini, S. Bianchi, Fiamma Capitanio , et al. · 2024

We report the first simultaneous X-ray spectropolarimetric observation of the bright atoll neutron star low-mass X-ray binary GX 3+1, performed by the Imaging X-ray Polarimetry Explorer (IXPE) joint with NICER and NuSTAR . The source does …

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