FRB 20240114A shows a ~112-day periodic modulation in central emission frequency with systematic upward drift within each period at >6σ significance.
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D., Ravi, V., Belov, K
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Two FRBs exhibit microlensing signatures consistent with intermediate-mass black holes of masses approximately 500-600 and 1500-2500 solar masses, interpreted as possible evidence for isolated primordial black holes comprising about 4% of dark matter.
A second coherent radio burst spanning 704-4032 MHz with spectral index -2.18, 54% linear and 22% circular polarization, and an orthogonal polarization angle jump was detected from 2XMM J104608.7-594306, showing rare radio activity in sources thought to be radio-quiet.
Spectral fits to magnetar burst X-rays disfavor light ions and favor effective charge Z~37, providing evidence for heavy nuclei from the neutron star crust.
A 4200-hour campaign on FRB 20240114A finds that the highest-energy bursts account for most of the observed radio energy release, with a break in the energy distribution at ~2×10^40 erg and a linear DM rise of +0.96 pc cm^{-3} over 318 days.
CHIME/FRB has now cataloged 80 repeating FRB sources whose burst rates and upper limits are consistent with a power-law distribution implying 50-100% of all FRBs repeat.
Polarization position angles of repeating FRBs are Gaussian distributed with no periodicity, arising from geometric projection in a stochastically varying magnetosphere that also explains non-repeating FRBs.
A search of repeating FRBs identifies RM flare candidates in FRB 20121102A, FRB 20201124A, and FRB 20180916B, suggesting such events may be common and tied to dynamic magneto-ionic environments.
Synchrotron cooling produces an energy-dependent loss cone and a cooled-loss-cone plasma distribution in neutron star outer magnetospheres, with losses localized at a few hundred to a thousand stellar radii.
CASM-256 is a new 256-antenna radio array at Owens Valley that uses real-time digital beamforming to search for fast radio bursts and galactic transients over a huge sky area.
No statistically significant excess of associations is found between CHIME FRBs and Swift GRBs after spatial, redshift, and temporal filtering, consistent with random coincidences.
Simulations demonstrate that Cosmic Explorer can robustly constrain cosmology and host galaxy parameters from GW-FRB associations using luminosity distance-dispersion measure relations without spectroscopic redshifts, unlike the current LIGO-Virgo network.
An MCMC-based period search method recovers previously reported candidate periods in FRB 20201124A observations.
Wideband observations show M28A giant pulses differ from FRB 20200120E bursts in duration, luminosity, timing statistics, and spectral structure, yielding no strong evidence for a direct link.
FRB 20220912A shows bimodal burst intervals, a 2.3-sigma DM rise of 1.4 pc cm^{-3} yr^{-1}, no RM trend, and possibly unique local environment compared to other repeaters.
Matching FRB QPOs to crustal modes constrains the neutron star mass to 1.00-1.76 solar masses, radius to ~13 km, and nuclear symmetry energy slope L to 59.5-96.8 MeV.
FRB 20250316A is confirmed as a pronounced outlier whose peak flux and fluence imply return periods of roughly 30-800 years and 8-55 years respectively under GEV modeling of the CHIME catalog.
Frabjous applies deep learning to classify FRB morphologies into five classes at 55% accuracy by augmenting limited real data with simulations.
Author contributes to SPOTLIGHT collaboration using modern radio tech to search for fast radio transients and pulsars.
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Spectral Evidence of Heavy Nuclei from the Neutron Star Crust in Magnetar Bursts
Spectral fits to magnetar burst X-rays disfavor light ions and favor effective charge Z~37, providing evidence for heavy nuclei from the neutron star crust.