Dense Forests of Microshots in Bursts from FRB 20220912A
Dant\'e M. Hewitt, Jason W. T. Hessels, Omar S. Ould-Boukattine,, Pragya Chawla, Isma\"el Cognard, Akshatha Gopinath, Lucas Guillemot, Daniela, Huppenkothen, Kenzie Nimmo6, Mark P. Snelders

TL;DR
This paper reports the discovery of microsecond-scale, highly luminous, broadband bursts called microshots from the repeating FRB 20220912A, revealing dense forests of microshots with unique polarization and scintillation properties, suggesting a potentially different emission mechanism.
Contribution
It introduces the concept of microshots and their dense clustering into forests, providing detailed polarization and scintillation analysis, and proposing a new emission mechanism hypothesis.
Findings
Microshots are extremely luminous (~450 Jy) and short (~16 microseconds).
Microshots cluster into dense forests modeled by Weibull distributions.
Bursts are nearly 100% linearly polarized with low circular polarization.
Abstract
We report on exceptionally bright bursts (>400 Jy ms) detected from the repeating fast radio burst source FRB 20220912A using the Nan\c{c}ay Radio Telescope (NRT), as part of the ECLAT (Extragalactic Coherent Light from Astrophysical Transients) monitoring campaign. These bursts exhibit extremely luminous, broadband, short-duration structures (~ 16 microseconds), which we term 'microshots' and which can be especially well studied in the NRT data given the excellent signal-to-noise and dynamic range (32-bit samples). The estimated peak flux density of the brightest microshot is 450 Jy. We show that the microshots are clustered into dense 'forests', by modelling them as Weibull distributions and obtaining Weibull shape parameters of approximately 0.5. Our polarimetric analysis reveals that the bursts are nearly 100% linearly polarised; have < 10% circular polarisation fractions; a…
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Stellar, planetary, and galactic studies · Adaptive optics and wavefront sensing
