A VOEvent based automatic trigger system for the Murchison Widefield Array
MetadataShow full item record
Funding and Sponsorship
© Astronomical Society of Australia 2019; published by Cambridge University Press.
The Murchison Widefield Array (MWA) is an electronically steered low frequency ($<300$\,MHz) radio interferometer, with a `slew' time less than 8seconds. Low frequency ($\sim 100$\,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 $\geq 0.5$\,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.
Showing items related by title, author, creator and subject.
Anderson, Gemma; Staley, T.; van der Horst, A.; Fender, R.; Rowlinson, A.; Mooley, K.; Broderick, J.; Wijers, R.; Rumsey, C.; Titterington, D. (2018)We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gamma-ray bursts (GRBs). AMI observes at a central frequency of 15.7 GHz and is equipped with a fully automated rapid-response mode, which ...
Petroff, E.; Bailes, M.; Barr, E.; Barsdell, B.; Bhat, Ramesh; Bian, F.; Burke-Spolaor, S.; Caleb, M.; Champion, D.; Chandra, P.; Da Costa, G.; Delvaux, C.; Flynn, C.; Gehrels, N.; Greiner, J.; Jameson, A.; Johnston, S.; Kasliwal, M.; Keane, E.; Keller, S.; Kocz, J.; Kramer, M.; Leloudas, G.; Malesani, D.; Mulchaey, J.; Ng, C.; Ofek, E.; Perley, D.; Possenti, A.; Schmidt, B.; Shen, Y.; Stappers, B.; Tisserand, P.; van Straten, W.; Wolf, C. (2015)Fast radio bursts (FRBs) are one of the most tantalizing mysteries of the radio sky; their progenitors and origins remain unknown and until now no rapid multiwavelength follow-up of an FRB has been possible. New instrumentation ...
Anderson, Gemma; Van der horst, A.; Staley, T.; Fender, R.; Wijers, R.; Scaife, A.; Rumsey, C.; Titterington, D.; Rowlinson, A.; Saunders, R. (2014)We present one of the best sampled early-time light curves of a gamma-ray burst (GRB) at radio wavelengths. Using the Arcminute Mircrokelvin Imager (AMI), we observed GRB 130427A at the central frequency of 15.7 GHz between ...