FRB microstructure revealed by the real-time detection of FRB170827

Abstract

We report a new Fast Radio Burst (FRB) discovered in real-time as part of the UTMOST project at the Molonglo Observatory Synthesis Radio Telescope (MOST). FRB170827 is the first detected with our low-latency ($<24$ s), machine-learning-based FRB detection system. The FRB discovery was accompanied by the capture of voltage data at the native time and frequency resolution of the observing system, enabling coherent dedispersion and detailed off-line analysis, which have unveiled fine temporal and frequency structure. The dispersion measure (DM) of 176.80 $\pm$ 0.04 pc cm${}^{-3}$, is the lowest of the FRB population. The Milky Way contribution along the line of sight is $\sim$ 40 pc cm${}^{-3}$, leaving an excess DM of $\sim$ 145 pc cm${}^{-3}$. The FRB has a fluence $>$ 20 $\pm$ 7 Jy ms, and is narrow, with a width of $\sim$ 400 $\mu$s at 10$\%$ of its maximum amplitude. However, the burst shows three temporal components, the narrowest of which is $\sim$ 30 $\mu$s, and a scattering timescale of $4.1\pm 2.7$ $\mu$s. The FRB shows spectral modulations on frequency scales of 1.5 MHz and 0.1 MHz. Both are prominent in the dynamic spectrum, which shows a very bright region of emission between 841 and 843 MHz, and weaker, patchy emission across the entire band. We show the fine spectral structure could arise in the FRB host galaxy, or its immediate vicinity.

arXiv comment10 pages, 6 figures, accepted for publication in MNRAS

References in corpus (42)

• emcee: The MCMC Hammer
• A bright millisecond radio burst of extragalactic origin
• The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
• A Repeating Fast Radio Burst
• The direct localization of a fast radio burst and its host
• The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102
• SkyMapper and the Southern Sky Survey
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• An extreme magneto-ionic environment associated with the fast radio burst source FRB 121102
• NE2001.I. A New Model for the Galactic Distribution of Free Electrons and its Fluctuations
• FRBCAT: The Fast Radio Burst Catalogue
• The Repeating Fast Radio Burst FRB 121102 as Seen on Milliarcsecond Angular Scales
• Dense magnetized plasma associated with a fast radio burst
• Millisecond Magnetar Birth Connects FRB 121102 to Superluminous Supernovae and Long Duration Gamma-ray Bursts
• The High Time Resolution Universe Pulsar Survey I: System configuration and initial discoveries
• Fast radio bursts: the last sign of supramassive neutron stars
• Cosmological Fast Radio Bursts from Binary Neutron Star Mergers
• Supergiant Pulses from Extragalactic Neutron Stars
• A Fast Radio Burst Host Galaxy
• Five new Fast Radio Bursts from the HTRU high latitude survey: first evidence for two-component bursts
• A real-time fast radio burst: polarization detection and multiwavelength follow-up
• Probing the Cosmic Reionization History and Local Environment of Gamma-Ray Bursts through Radio Dispersion
• On the origin of a highly-dispersed coherent radio burst
• The magnetic field and turbulence of the cosmic web measured using a brilliant fast radio burst
• The SUrvey for Pulsars and Extragalactic Radio Bursts II: New FRB discoveries and their follow-up
• The detection of an extremely bright fast radio burst in a phased array feed survey
• A fast radio burst in the direction of the Carina dwarf spheroidal galaxy
• FRB 121102 is coincident with a star forming region in its host galaxy
• The Galactic Position Dependence of Fast Radio Bursts and the Discovery of FRB 011025
• Temporal Smearing of Transient Radio Sources by the Intergalactic Medium
• The SUrvey for Pulsars and Extragalactic Radio Bursts I: Survey Description and Overview
• Discovery of 14 radio pulsars in a survey of the Magellanic Clouds
• Local Circumnuclear Magnetar Solution to Extragalactic Fast Radio Bursts
• Are there multiple populations of Fast Radio Bursts?
• The Crab Pulsar at Centimeter Wavelengths II: Single Pulses
• A polarized fast radio burst at low Galactic latitude
• FRB event rate counts I --- Interpreting the Observations
• Fast Radio Transient searches with UTMOST at 843 MHz
• The UTMOST: A hybrid digital signal processor transforms the MOST
• Associating Fast Radio Bursts with Their Host Galaxies
• The observed properties of Fast Radio Bursts
• Determination of the Sun's Offset from the Galactic Plane Using Pulsars

Cited by in corpus (100)

• Fast Radio Bursts
• A Living Theory Catalogue for Fast Radio Bursts
• CHIME/FRB Detection of Eight New Repeating Fast Radio Burst Sources
• Highest-frequency detection of FRB 121102 at 4-8 GHz using the Breakthrough Listen Digital Backend at the Green Bank Telescope
• FRB 121102 Bursts Show Complex Time-Frequency Structure
• A Second Source of Repeating Fast Radio Bursts
• The low density and magnetization of a massive galaxy halo exposed by a fast radio burst
• Fast Radio Burst Morphology in the First CHIME/FRB Catalog
• Observations of Fast Radio Bursts at Frequencies down to 400 Megahertz
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• A sample of low energy bursts from FRB 121102
• High time resolution and polarisation properties of ASKAP-localised fast radio bursts
• Surveying the reach and maturity of machine learning and artificial intelligence in astronomy
• On the normalised FRB luminosity function
• Faint Repetitions from a Bright Fast Radio Burst Source
• The spectral properties of the bright FRB population
• Spectropolarimetric analysis of FRB 181112 at microsecond resolution: Implications for Fast Radio Burst emission mechanism
• The z-DM distribution of fast radio bursts
• FRB Coherent Emission from Decay of Alfven Waves
• Fast Radio Bursts
• The 60 pc Environment of FRB 20180916B
• Extremely band-limited repetition from a fast radio burst source
• Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz
• Are all fast radio bursts repeating sources?
• The UTMOST pulsar timing programme II: Timing noise across the pulsar population
• Simultaneous multi-telescope observations of FRB 121102
• Five new real-time detections of Fast Radio Bursts with UTMOST
• Fast Radio Bursts
• The UTMOST pulsar timing programme I: overview and first results
• Interpreting the distributions of FRB observables
• Shock-powered radio precursors of neutron star mergers from accelerating relativistic binary winds
• CRAFTS for Fast Radio Bursts Extending the dispersion-fluence relation with new FRBs detected by FAST
• A Fast Radio Burst with frequency-dependent polarization detected during Breakthrough Listen observations
• The Thousand-Pulsar-Array programme on MeerKAT III: Giant pulse characteristics of PSR J0540$-$6919
• What does FRB light-curve variability tell us about the emission mechanism?
• The discovery and scientific potential of fast radio bursts
• Pulse Morphology of the Galactic Center Magnetar PSR J1745-2900
• Coherent Plasma-Curvature Radiation in FRB
• A bright, high rotation-measure FRB that skewers the M33 halo
• Beaming as an explanation of the repetition/width relation in FRBs
• Exploring the epoch of hydrogen reionization using FRBs
• A population analysis of pulse broadening in ASKAP Fast Radio Bursts
• Detection of ultra-fast radio bursts from FRB 20121102A
• Commensal discovery of four Fast Radio Bursts during Parkes Pulsar Timing Array observations
• Constraining Primordial Black Holes using Fast Radio Burst Gravitational-Lens Interferometry with CHIME/FRB
• Lensing of fast radio bursts: future constraints on primordial black hole density with an extended mass function and a new probe of exotic compact fermion and boson stars
• Detection of Bursts from FRB 121102 with the Effelsberg 100-m Radio Telescope at 5 GHz and the Role of Scintillation
• The Future of Fast Radio Burst Science
• A Fast Radio Burst discovered in FAST drift scan survey
• Probing the extragalactic fast transient sky at minute timescales with DECam
• A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts
• Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
• Probing Dynamics of Boson Stars by Fast Radio Bursts and Gravitational Wave Detection
• Magnetars from Neutron Star--White Dwarf Mergers: Application to Fast Radio Bursts
• Constraining small scale magnetic fields through plasma lensing: Application to the Black widow eclipsing pulsar binary
• Synthesizing the intrinsic FRB population using frbpoppy
• Fast radio burst source properties from polarization measurements
• Self-modulation of Fast Radio Bursts
• The dispersion measure and scattering of FRBs: Contributions from the intergalactic medium, foreground halos, and hosts
• Burst timescales and luminosities link young pulsars and fast radio bursts
• FRB Energetics and Sources
• The discovery and significance of fast radio bursts
• Zwicky Transient Facility constraints on the optical emission from the nearby repeating FRB 180916.J0158+65
• Enhanced Rates of Fast Radio Bursts from Galaxy Clusters
• Radiation Forces Constrain the FRB Mechanism
• A fast radio burst with a low dispersion measure
• Radio Properties of Rotating Radio Transients: Single Pulse Spectral and Wait Time Analyses
• Identification of BASS DR3 Sources as Stars, Galaxies and Quasars by XGBoost
• A Southern sky search for repeating Fast Radio Bursts using the Australian SKA Pathfinder
• Estimating fast transient detection pipeline efficiencies at UTMOST via real-time injection of mock FRBs
• Systematic performance of the ASKAP Fast Radio Burst search algorithm
• Scintillation can explain the spectral structure of the bright radio burst from SGR 1935+2154
• Hunting for radio emission from the intermittent pulsar J1107-5907 at low frequencies
• Periodic activity from fast radio burst FRB180916 explained in the frameof the orbiting asteroid model
• FRBs Lensed by Point Masses II. The multi-peaked FRBs from the point view of microlensing
• A Toy Model for the Time-Frequency Structure of Fast Radio Bursts: Implications for the CHIME Burst Dichotomy
• Narrow-band giant pulses from the Crab pulsar
• MWA tied-array processing III: Microsecond time resolution via a polyphase synthesis filter
• Detection of a glitch in the pulsar J1709-4429
• Verifying and Reporting Fast Radio Bursts
• Gravitational Microlensing Time Delays at High Optical Depth: Image Parities and the Temporal Properties of Fast Radio Bursts
• Constraining the FRB mechanism from scintillation in the host galaxy
• The ultra narrow FRB20191107B, and the origins of FRB scattering
• Fast radio bursts at the dawn of the 2020s
• The UTMOST Survey for Magnetars, Intermittent pulsars, RRATs and FRBs I: System description and overview
• The Curious Case of Twin Fast Radio Bursts: Evidence for Neutron Star Origin?
• A Bright Fast Radio Burst from FRB 20200120E with Sub-100-Nanosecond Structure
• Highly polarised microstructure from the repeating FRB 20180916B
• Population modelling of FRBs from intrinsic properties
• A maximum likelihood estimate of the parameters of the FRB population
• Comprehensive analysis of the Apertif Fast Radio Burst sample: similarities with young, energetic neutron stars
• Constrains on optical emission of FAST-detected FRB 20181130B with GWAC synchronized observations
• Constraining the Fast Radio Burst (FRB) properties using the joint distributions of dispersion measure and fluence of the events detected at Parkes, ASKAP, CHIME and UTMOST
• Scintillometry of Fast Radio Bursts: Resolution effects in two-screen models
• The localization of single pulse in VLBI observation
• The Extreme Faraday Effect in Fast Radio Bursts
• Flickers, Bursts, and Dips: Detecting Rapid Variability with the g(2) Autocorrelation Function
• Geometrical envelopes of fast radio bursts
• Detecting FRB by DANCE: a method based on DEnsity ANalysis and Cluster Extraction
• Detection of Partial Coherence due to Multipath Propagation for FRB 20220413B with CHIME/FRB