التفاصيل البيبلوغرافية
| العنوان: |
A search for radio afterglows from gamma-ray bursts with the Australian Square Kilometre Array Pathfinder |
| المؤلفون: |
Adam Stewart, Vanessa A. Moss, Emil Lenc, David McConnell, Tara Murphy, James K. Leung, Giancarlo Ghirlanda, Aidan Hotan, Dougal Dobie, W. Raja, C. L. Hale, Julie Banfield, Joshua Pritchard, David L. Kaplan, Matthew Whiting |
| بيانات النشر: |
arXiv, 2021. |
| سنة النشر: |
2021 |
| مصطلحات موضوعية: |
Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Declination, law.invention, Telescope, law, 0103 physical sciences, Continuum (set theory), 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, Astronomy and Astrophysics, Celestial sphere, Afterglow, Supernova, 13. Climate action, Space and Planetary Science, Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Gamma-ray burst |
| الوصف: |
We present a search for radio afterglows from long gamma-ray bursts using the Australian Square Kilometre Array Pathfinder (ASKAP). Our search used the Rapid ASKAP Continuum Survey, covering the entire celestial sphere south of declination $+41^\circ$, and three epochs of the Variables and Slow Transients Pilot Survey (Phase 1), covering $\sim 5,000$ square degrees per epoch. The observations we used from these surveys spanned a nine-month period from 2019 April 21 to 2020 January 11. We crossmatched radio sources found in these surveys with 779 well-localised (to $\leq 15''$) long gamma-ray bursts occurring after 2004 and determined whether the associations were more likely afterglow- or host-related through the analysis of optical images. In our search, we detected one radio afterglow candidate associated with GRB 171205A, a local low-luminosity gamma-ray burst with a supernova counterpart SN 2017iuk, in an ASKAP observation 511 days post-burst. We confirmed this detection with further observations of the radio afterglow using the Australia Telescope Compact Array at 859 days and 884 days post-burst. Combining this data with archival data from early-time radio observations, we showed the evolution of the radio spectral energy distribution alone could reveal clear signatures of a wind-like circumburst medium for the burst. Finally, we derived semi-analytical estimates for the microphysical shock parameters of the burst: electron power-law index $p = 2.84$, normalised wind-density parameter $A_* = 3$, fractional energy in electrons $\epsilon_{e} = 0.3$, and fractional energy in magnetic fields $\epsilon_{B} = 0.0002$.
Comment: 18 pages, 7 figures; accepted for publication in MNRAS |
| DOI: |
10.48550/arxiv.2102.01948 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::033126bf27f01912aff6982540d7fbe8 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....033126bf27f01912aff6982540d7fbe8 |
| قاعدة البيانات: |
OpenAIRE |