High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array

Tian, J; Anderson, GE; Hancock, PJ; Miller-Jones, JCA; Sokolowski, M; Swainston, NA; Rowlinson, A; Williams, A; Kaplan, DL; Hurley-Walker, N; Morgan, J; Bhat, NDR; Ung, D; Tingay, S; Bannister, KW; Bell, ME; Meyers, BW; Walker, M

High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array

Tian, J Anderson, GE Hancock, PJ Miller-Jones, JCA Sokolowski, M Swainston, NA Rowlinson, A Williams, A Kaplan, DL Hurley-Walker, N Morgan, J Bhat, NDR Ung, D Tingay, S Bannister, KW Bell, ME Meyers, BW Walker, M

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Publisher:: OXFORD UNIV PRESS
Publication Type:: Journal Article
Citation:: Monthly Notices of the Royal Astronomical Society, 2022, 514, (2), pp. 2756-2768
Issue Date:: 2022-08-01

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Field	Value	Language
dc.contributor.author	Tian, J
dc.contributor.author	Anderson, GE
dc.contributor.author	Hancock, PJ
dc.contributor.author	Miller-Jones, JCA
dc.contributor.author	Sokolowski, M
dc.contributor.author	Swainston, NA
dc.contributor.author	Rowlinson, A
dc.contributor.author	Williams, A
dc.contributor.author	Kaplan, DL
dc.contributor.author	Hurley-Walker, N
dc.contributor.author	Morgan, J
dc.contributor.author	Bhat, NDR
dc.contributor.author	Ung, D
dc.contributor.author	Tingay, S
dc.contributor.author	Bannister, KW
dc.contributor.author	Bell, ME
dc.contributor.author	Meyers, BW
dc.contributor.author	Walker, M
dc.date.accessioned	2023-07-02T23:00:37Z
dc.date.available	2023-07-02T23:00:37Z
dc.date.issued	2022-08-01
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2022, 514, (2), pp. 2756-2768
dc.identifier.issn	0035-8711
dc.identifier.issn	1365-2966
dc.identifier.uri	http://hdl.handle.net/10453/171101
dc.description.abstract	We present a low-frequency (170-200 MHz) search for prompt radio emission associated with the long GRB 210419A using the rapid-response mode of the Murchison Widefield Array (MWA), triggering observations with the Voltage Capture System for the first time. The MWA began observing GRB 210419A within 89 s of its detection by Swift, enabling us to capture any dispersion delayed signal emitted by this gamma-ray burst (GRB) for a typical range of redshifts. We conducted a standard single pulse search with a temporal and spectral resolution of 100, μs and 10 kHz over a broad range of dispersion measures from 1 to 5000, pc, cm-3, but none were detected. However, fluence upper limits of 77-224 Jy ms derived over a pulse width of 0.5-10 ms and a redshift of 0.6 < z < 4 are some of the most stringent at low radio frequencies. We compared these fluence limits to the GRB jet-interstellar medium interaction model, placing constraints on the fraction of magnetic energy (ϵB ≲ [0.05-0.1]). We also searched for signals during the X-ray flaring activity of GRB 210419A on minute time-scales in the image domain and found no emission, resulting in an intensity upper limit of 0.57, Jy, beam-1, corresponding to a constraint of ϵB ≲ 10-3. Our non-detection could imply that GRB 210419A was at a high redshift, there was not enough magnetic energy for low-frequency emission, or the radio waves did not escape from the GRB environment.
dc.language	English
dc.publisher	OXFORD UNIV PRESS
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society
dc.relation.isbasedon	10.1093/mnras/stac1483
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0201 Astronomical and Space Sciences
dc.subject.classification	Astronomy & Astrophysics
dc.title	High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array
dc.type	Journal Article
utslib.citation.volume	514
utslib.for	0201 Astronomical and Space Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2023-07-02T23:00:36Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	514
utslib.citation.issue	2

Abstract:

We present a low-frequency (170-200 MHz) search for prompt radio emission associated with the long GRB 210419A using the rapid-response mode of the Murchison Widefield Array (MWA), triggering observations with the Voltage Capture System for the first time. The MWA began observing GRB 210419A within 89 s of its detection by Swift, enabling us to capture any dispersion delayed signal emitted by this gamma-ray burst (GRB) for a typical range of redshifts. We conducted a standard single pulse search with a temporal and spectral resolution of 100, μs and 10 kHz over a broad range of dispersion measures from 1 to 5000, pc, cm-3, but none were detected. However, fluence upper limits of 77-224 Jy ms derived over a pulse width of 0.5-10 ms and a redshift of 0.6 < z < 4 are some of the most stringent at low radio frequencies. We compared these fluence limits to the GRB jet-interstellar medium interaction model, placing constraints on the fraction of magnetic energy (ϵB ≲ [0.05-0.1]). We also searched for signals during the X-ray flaring activity of GRB 210419A on minute time-scales in the image domain and found no emission, resulting in an intensity upper limit of 0.57, Jy, beam-1, corresponding to a constraint of ϵB ≲ 10-3. Our non-detection could imply that GRB 210419A was at a high redshift, there was not enough magnetic energy for low-frequency emission, or the radio waves did not escape from the GRB environment.

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http://hdl.handle.net/10453/171101