A Deep Search for Prompt Radio Emission From the Short GRB 150424a With the Murchison Widefield Array

Kaplan, David L.; Rowlinson, A.; Bannister, K. W.; Bell, M. E.; Croft, Steve; Murphy, Tara; Tingay, S. J.; Wayth, R. B.; Williams, A.

doi:10.1088/2041-8205/814/2/l25

Cited by 48 publications

(81 citation statements)

References 42 publications

(59 reference statements)

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“…When the beaming and efficiency factor is assumed to be f = 3.45 (using the analysis of Rowlinson et al 2014), the predicted flux drops to ∼ 1 mJy. Our limits are three orders of magnitude deeper than the previous best obtained by the MWA (Kaplan et al 2015). Assuming that the newly formed magnetar is emitting consistently with the known pulsar population and that the emission can escape the system, the emission would have been likely, or close to, detectable in our observations if its beaming and efficiency properties are consistent with the known GRB magnetar population (Rowlinson et al 2014).…”

Section: Pulsar Like Emissionsupporting

confidence: 45%

“…With the exception of the work by Bannister et al (2012), which used rapid response observations by the Parkes Radio Telescope, the previous surveys have typically been either whole sky instruments (with limited sensitivity) or hampered by very slow slew times. Recently, astronomers used the Murchison Widefield Array (MWA; Tingay et al 2013), a low frequency radio telescope array with no moving parts, to enable a very rapid response observation of a short GRB (Kaplan et al 2015) reaching a sensitivity of ∼1 Jy on 30 minute time scales. Additionally, the Long Wavelength Array (LWA; Taylor et al 2012), a whole sky transient survey instrument, was able to constrain prompt emission from a short GRB to a 1σ flux density limit of 4.5 Jy beam −1 (Anderson et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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LOFAR early-time search for coherent radio emission from GRB 180706A

Rowlinson

Gourdji

Meulen

et al. 2019

Monthly Notices of the Royal Astronomical Society

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The nature of the central engines of gamma-ray bursts (GRBs) and the composition of their relativistic jets are still under debate. If the jets are Poynting flux dominated rather than baryon dominated, a coherent radio flare from magnetic re-connection events might be expected with the prompt gamma-ray emission. There are two competing models for the central engines of GRBs; a black hole or a newly formed milli-second magnetar. If the central engine is a magnetar it is predicted to produce coherent radio emission as persistent or flaring activity. In this paper, we present the deepest limits to date for this emission following LOFAR rapid response observations of GRB 180706A. No emission is detected to a 3σ limit of 1.7 mJy beam −1 at 144 MHz in a two-hour LOFAR observation starting 4.5 minutes after the gamma-ray trigger. A forced source extraction at the position of GRB 180706A provides a marginally positive (1 sigma) peak flux density of 1.1 ± 0.9 mJy. The data were time-sliced into different sets of snapshot durations to search for FRB like emission. No short duration emission was detected at the location of the GRB. We compare these results to theoretical models and discuss the implications of a non-detection.

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Section: Pulsar Like Emissionsupporting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

LOFAR early-time search for coherent radio emission from GRB 180706A

Rowlinson

Gourdji

Meulen

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…The MWA is often used to undertake surveys, for a range of science goals including dedicated (e.g., Bell et al 2014;Murphy et al 2015) and commensal (e.g., Rowlinson et al 2016;Tingay et al 2015) transient searches, but it has also been used for triggered follow-up of transients at other wavelengths (e.g., Kaplan et al 2015). Its huge field of view (700 square degrees at 150 MHz) also means that archival observations have a much larger chance, compared to most other radio telescopes, of serendipitously covering an event of interest.…”

Section: Mwa Follow-up Of Antares Eventsmentioning

confidence: 99%

Murchison Widefield Array Limits on Radio Emission From Antares Neutrino Events

Croft¹,

Kaplan²,

Tingay³

et al. 2016

ApJL

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We present a search, using the Murchison Widefield Array (MWA), for electromagnetic (EM) counterparts to two candidate high-energy neutrino events detected by the ANTARES neutrino telescope in 2013 November and 2014 March. These events were selected by ANTARES because they are consistent, within 0°.4, with the locations of galaxies within 20 Mpc of Earth. Using MWA archival data at frequencies between 118 and 182 MHz, taken ∼20days prior to, at the same time as, and up to a year after the neutrino triggers, we look for transient or strongly variable radio sources that are consistent with the neutrino positions. No such counterparts are detected, and we set a 5σ upper limit for low-frequency radio emission of ∼10 37 erg s −1 for progenitors at 20 Mpc. If the neutrino sources are instead not in nearby galaxies, but originate in binary neutron star coalescences, our limits place the progenitors at z  0.2. While it is possible, due to the high background from atmospheric neutrinos, that neither event is astrophysical, the MWA observations are nevertheless among the first to follow up neutrino candidates in the radio, and illustrate the promise of wide-field instruments like MWA for detecting EM counterparts to such events.

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“…In October 2017, the High Band Array (120 − 168 MHz) of the Low Frequency Array (LOFAR) enabled a rapid-response system capable of triggering within 3 − 5 min on transient alerts (referred to as the LOFAR Responsive Telescope 2 ). Meanwhile, the MWA, which operates in the 80 − 300 MHz frequency range (Tingay et al 2013;Wayth et al 2018), has been running a functional, yet somewhat limited rapid-response mode since December 2014 (Kaplan et al 2015). There are also all-sky low frequency radio experiments that have been (or are capable of being) onsky at the time of GRBs and gravitational wave events, including the LWA1 Prototype All Sky Imager (LWA1-PASI; Obenberger et al 2014), the Owens Vally Radio Observatory Long Wavelength Array (OVRO-LWA, 27-84 MHz; Anderson et al 2018b;Callister et al 2019), and the LOFAR Low Band Array (10 − 90 MHz) Amsterdam ASTRON Radio Transient Facility and Analysis Centre (AARTFAAC; Prasad et al 2014Prasad et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

A VOEvent-based automatic trigger system for the Murchison Widefield Array

Hancock

Anderson

Williams

et al. 2019

Publ. Astron. Soc. Aust.

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The Murchison Widefield Array (MWA) is an electronically steered low frequency (< 300 MHz) radio interferometer, with a 'slew' time less than 8 seconds. Low frequency (∼ 100 MHz) radio telescopes are ideally suited for rapid-response follow-up of transients due to their large field of view, the inverted spectrum of coherent emission, and the fact that the dispersion delay between a 1GHz and 100MHz pulse is on the order of 1 − 10 min for dispersion measures of 100 − 2000 pc/cm 3 . The MWA has previously been used to provide fast follow up for transient events including gamma-ray bursts, fast radio bursts, and gravitational waves, using systems that respond to gamma-ray coordinates network (GCN) packet-based notifications. We describe a system for automatically triggering MWA observations of such events, based on VOEvent triggers, which is more flexible, capable, and accurate than previous systems. The system can respond to external multi-messenger triggers, which makes it well-suited to searching for prompt coherent radio emission from gamma-ray bursts, the study of fast radio bursts and gravitational waves, single pulse studies of pulsars, and rapid follow-up of high-energy superflares from flare stars. The new triggering system has the capability to trigger observations in both the regular correlator mode (limited to ≥ 0.5 s integrations) or using the Voltage Capture System (VCS, 0.1 ms integration) of the MWA, and represents a new mode of operation for the MWA. The upgraded standard correlator triggering capability has been in use since MWA observing semester 2018B (July-Dec 2018), and the VCS and buffered mode triggers will become available for observing in a future semester.

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A Deep Search for Prompt Radio Emission From the Short GRB 150424a With the Murchison Widefield Array

Cited by 48 publications

References 42 publications

LOFAR early-time search for coherent radio emission from GRB 180706A

LOFAR early-time search for coherent radio emission from GRB 180706A

Murchison Widefield Array Limits on Radio Emission From Antares Neutrino Events

A VOEvent-based automatic trigger system for the Murchison Widefield Array

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