Fast Transient Detection with the (e)-EVN

1. Fast Transient Detection with the (e)-EVN Andrew Siemion Zsolt Paragi Aard Keimpema

2. Commensal Fast Transient Detection with Interferometers and Possibilities for the (e)-EVN Andrew Siemion Zsolt Paragi Aard Keimpema

3. Coherent emission mechanisms - physics of particle acceleration. • Very high energy densities - Giant Pulses from the Crab Pulsar have Tb ~ 1040 K! • Probing intervening media • Equation of state at nuclear densities • Probe of strong field gravity • Are we Alone? Nanosecond Scale Crab Giant Pulses, Hankins et al. Nature 2003

4. Expecting the Unexpected Vela satellite discovery of Gamma Ray Bursts Jocelyn Bell, discovery of pulsars M. McLaughlin et al., RRATs

5. Frequency vs. Time Waterfall (Lorimer 2007)

6. The Saga of the ‘Lorimer Burst’ Astronomer Happiness Time

7. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Astronomer Happiness Time

8. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Astronomer Happiness Deneva et al. 2009 non-detection at Arecibo Time

9. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Astronomer Happiness Deneva et al. 2009 non-detection at Arecibo Burke-Spolaor et al. 2010 ‘Perytons’ Time

10. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Astronomer Happiness Deneva et al. 2009 non-detection at Arecibo Burke-Spolaor et al. 2010 ‘Perytons’ 2011 non-detections at ATA, GBT.... Time

11. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Astronomer Happiness Deneva et al. 2009 non-detection at Arecibo Keane et al. 2011 DM=745 Burke-Spolaor et al. 2010 ‘Perytons’ 2011 non-detections at ATA, GBT.... Time

12. The Saga of the ‘Lorimer Burst’ Lorimer et al. 2007 ‘A Millisecond Burst’ Thornton et al. 2013 ‘A Population...’ Astronomer Happiness Deneva et al. 2009 non-detection at Arecibo Keane et al. 2011 DM=745 Burke-Spolaor et al. 2010 ‘Perytons’ 2011 non-detections at ATA, GBT.... Time

13. Parkes Multibeam Pointing During Lorimer Detection (Lorimer 2007)

14. But what are they?!?! • More Examples • Observing time is precious - commensal observations can provide much more telescope time than possible with dedicated observations. • More Information • Interferometers generally provide much better position information, with VLBI systems potentially yielding milli-arcsecond position information. - Location, Location, Location! • If voltage data is captured, much more in depth analysis is possible - e.g. coherent de-dispersion, very high time resolution, etc...

15. New Flexible Correlators

16. 100s Gb/s 1 Gb/s 1 Mb/s Casey Law, Geoff Bower: Conceptual pipeline for bispectrum transient detection @ JVLA (Law et al. 2012, http://arxiv.org/abs/1208.6056) Pulse localized! Bispectrum lightcurve and diagnostic for VLA data toward J0628+0909

17. Thompson et al., 2013 Wayth et al., ApJL 2012 Trott et al., ApJ 2013 Single Pulse from J1919+0021

18. SFXC Software Correlator readily able to produce delay-corrected autocorrelations • Begin with pseudo-real-time ‘out-of-the-box’ search pipelines, e.g. PRESTO, SigProc, iterate and improve, eventually move to real-time (GPU accelerated) pipeline

19. Hartebeesthoek Zelenchukskaya Onsala Urumqi Noto Badary Effelsberg Jodrell Bank Westerbork 180 s 0 s 0 1 2 • B1937+21 - Folded Profiles SFXC delay-corrected autocorrelations .filterbank conversion PRESTO

20. Nt Ef Wb Bd Jb On Hh Zc Ur

21. Arcminutes Arcminutes A Heterogeneous Array

22. (e)EVN 500 hours - baseline config