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

Tian, Jia-Jin; Anderson, G.; Hancock, P. J.; Miller-Jones, J. C. A.; Sokołowski, M.; Swainston, N. A.; Rowlinson, A.; Williams, A.; Kaplan, David L.; Hurley‐Walker, N.; Morgan, John S.; Bhat, N. D. R.; Ung, D.; Tingay, Steven; Bannister, K. W.; Bell, M. E.; Meyers, Bradley W.; Walker, M.

doi:10.1093/mnras/stac1483

Cited by 5 publications

(1 citation statement)

References 145 publications

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“…We can also perform offline correlation of the VCS data to create images over longer integrations to search for persistent pulsar emission or other predicted long-lived coherent radio emission (e.g. Starling et al 2020;Tian et al 2022b).…”

Section: Mwa Observing Strategiesmentioning

confidence: 99%

MWA rapid follow-up of gravitational wave transients: Prospects for detecting prompt radio counterparts

Tian,

Anderson,

Cooper

et al. 2023

Publ. Astron. Soc. Aust.

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We present and evaluate the prospects for detecting coherent radio counterparts to gravitational wave (GW) events using Murchison Widefield Array (MWA) triggered observations. The MWA rapid-response system, combined with its buffering mode ( $\sim$ 4 min negative latency), enables us to catch any radio signals produced from seconds prior to hours after a binary neutron star (BNS) merger. The large field of view of the MWA ( $\sim$ $1\,000\,\textrm{deg}^2$ at 120 MHz) and its location under the high sensitivity sky region of the LIGO-Virgo-KAGRA (LVK) detector network, forecast a high chance of being on-target for a GW event. We consider three observing configurations for the MWA to follow up GW BNS merger events, including a single dipole per tile, the full array, and four sub-arrays. We then perform a population synthesis of BNS systems to predict the radio detectable fraction of GW events using these configurations. We find that the configuration with four sub-arrays is the best compromise between sky coverage and sensitivity as it is capable of placing meaningful constraints on the radio emission from 12.6% of GW BNS detections. Based on the timescales of four BNS merger coherent radio emission models, we propose an observing strategy that involves triggering the buffering mode to target coherent signals emitted prior to, during or shortly following the merger, which is then followed by continued recording for up to three hours to target later time post-merger emission. We expect MWA to trigger on $\sim$ $5-22$ BNS merger events during the LVK O4 observing run, which could potentially result in two detections of predicted coherent emission.

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Section: Mwa Observing Strategiesmentioning

confidence: 99%

MWA rapid follow-up of gravitational wave transients: Prospects for detecting prompt radio counterparts

Tian,

Anderson,

Cooper

et al. 2023

Publ. Astron. Soc. Aust.

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A targeted search for repeating fast radio bursts with the MWA

Tian

Anderson

Hancock

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present a targeted search for low-frequency (144–215 MHz) FRB emission from five repeating FRBs using 23.3 hr of archival data taken with the Murchison Widefield Array (MWA) Voltage Capture System (VCS) between 2014 September and 2020 May. This is the first time that the MWA VCS has been used to search for FRB signals from known repeaters, which enables much more sensitive FRB searches than previously performed with the standard MWA correlator mode. We performed a standard single pulse search with a temporal and spectral resolution of 400 μs and 10 kHz, respectively, over a 100 pc cm−3 dispersion measure (DM) range centred at the known DM of each studied repeating FRB. No FRBs exceeding a 6σ threshold were detected. The fluence upper limits in the range of 32–1175 Jy ms and 36–488 Jy ms derived from 10 observations of FRB 20190711A and four observations of FRB 20201124A respectively, allow us to constrain the spectral indices of their bursts to ≳ −1 if these two repeaters were active during the MWA observations. If free-free absorption is responsible for our non-detection, we can constrain the size of the absorbing medium in terms of the electron temperature T to <1.00 × (T/104K)−1.35 pc, <0.92 × (T/104K)−1.35 pc and <[0.22–2.50] × (T/104K)−1.35 pc for FRB 20190117A, 20190711A, and 20201124A, respectively. However, given that the activities of these repeaters are not well characterised, our non-detections could also suggest they were inactive during the MWA observations.

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The most probable host of CHIME FRB 190425A, associated with binary neutron star merger GW190425, and a late-time transient search

Panther

Anderson

Bhandari

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The identification and localization of Fast Radio Bursts to their host galaxies has revealed important details about the progenitors of these mysterious, millisecond-long bursts of coherent radio emission. In this work we study the most probable host galaxy of the apparently non-repeating CHIME/FRB event FRB 20190425A — a particularly high luminosity, low dispersion measure event that was demonstrated in a recent paper to be temporally and spatially coincident with the LIGO-Virgo-KAGRA binary neutron star merger GW190425, suggesting an astrophysical association (p-value 0.0052). In this paper we remain agnostic to this result, and we confirm UGC10667 as the most probable host galaxy of FRB 20190425A, demonstrating that the host galaxies of low dispersion measure, one-off CHIME FRBs can be plausibly identified. We then perform multi-wavelength observations to characterize the galaxy and search for any afterglow emission associated with the FRB and its putative GW counterpart. We find no radio or optical transient emission in our observations 2.5 yr post-burst. UGC10667 is a spiral galaxy at z ∼ 0.03, dominated by an old stellar population. We find no evidence of a large population of young stars, with nebular emission dominated by star formation at a rate of 1 − 2 M⊙ yr−1. While we cannot rule out a young magnetar as the origin of FRB 20190425A, our observations are consistent with an origin in a long delay-time neutron star binary merger.

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

Cited by 5 publications

References 145 publications

MWA rapid follow-up of gravitational wave transients: Prospects for detecting prompt radio counterparts

MWA rapid follow-up of gravitational wave transients: Prospects for detecting prompt radio counterparts

A targeted search for repeating fast radio bursts with the MWA

The most probable host of CHIME FRB 190425A, associated with binary neutron star merger GW190425, and a late-time transient search

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