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PySE: Software for extracting sources from radio images

D. Carbone, H. Garsden, H. Spreeuw, J.D. Swinbank, A.J. van der Horst, A. Rowlinson, J.W. Broderick, E. Rol, C. Law, G. Molenaar, R.A.M.J. Wijers
2018 Astronomy and Computing  
PySE is a Python software package for finding and measuring sources in radio telescope images.  ...  The software was designed to detect sources in the LOFAR telescope images, but can be used with images from other radio telescopes as well.  ...  DC, RAMJW, AR, GM. acknowledge support from the European Research Council Advanced Grant 247295 "AARTFAAC".  ... 
doi:10.1016/j.ascom.2018.02.003 fatcat:6dqejlswljgw7ilqvb2yhkziea

The ASKAP/EMU Source Finding Data Challenge

A. M. Hopkins, M. T. Whiting, N. Seymour, K. E. Chow, R. P. Norris, L. Bonavera, R. Breton, D. Carbone, C. Ferrari, T. M. O. Franzen, H. Garsden, J. González-Nuevo (+22 others)
2015 Publications Astronomical Society of Australia  
As a step toward this goal we conducted a "Data Challenge" to test a variety of source finders on simulated images.  ...  We conclude with a series of recommendations for improving the performance of the ASKAPsoft source-finding tool.  ...  JGN acknowledges financial support from the Spanish MINECO for a 'Ramon y Cajal' fellowship, cofunded by the European Social Fund.  ... 
doi:10.1017/pasa.2015.37 fatcat:63s33szxcjenvfbpraodbvej6m

Efficient Source Finding for Radio Interferometric Images [article]

Luis Lucas, Tim Staley, Anna Scaife
2019 arXiv   pre-print
In radio astronomy, source finding has historically been performed by bespoke off-line systems; however, modern data acquisition systems as well as those proposed for upcoming observatories such as the  ...  One area where a change of approach is particularly necessary is in the design of fast imaging systems for transient studies.  ...  Acknowledgements The authors gratefully acknowledge support from the UK Science and Technology Facilities Council.  ... 
arXiv:1901.04956v1 fatcat:7c3zehgu5vcf5evcdd3pe6jyai

The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

G. H. Heald, R. F. Pizzo, E. Orrú, R. P. Breton, D. Carbone, C. Ferrari, M. J. Hardcastle, W. Jurusik, G. Macario, D. Mulcahy, D. Rafferty, A. Asgekar (+138 others)
2015 Astronomy and Astrophysics  
Images and catalogs for the full survey, expected to contain 150,000-200,000 sources, will be released to a public web server.  ...  We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.  ...  We thank the anonymous referee for comments that have improved this paper.  ... 
doi:10.1051/0004-6361/201425210 fatcat:taf5p5sswvd7fm7is3wmqspb7m

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

G. E. Anderson, T. D. Staley, A. J. van der Horst, R. P. Fender, A. Rowlinson, K. P. Mooley, J. W. Broderick, R. A. M. J. Wijers, C. Rumsey, D. J. Titterington
2017 Monthly notices of the Royal Astronomical Society  
Further AMI observations are manually scheduled for several days following the trigger.  ...  We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gamma-ray bursts (GRBs).  ...  ACKNOWLEDGEMENTS We thank the staff of the Mullard Radio Astronomy Observatory for their invaluable assistance in the operation of AMI.  ... 
doi:10.1093/mnras/stx2407 fatcat:dsawoojxajcgtbi2pukplxl7jm

Astronomical source finding services for the CIRASA visual analytic platform [article]

S. Riggi, C. Bordiu, F. Vitello, G. Tudisco, E. Sciacca, D. Magro, R. Sortino, C. Pino, M. Molinaro, M. Benedettini, S.Leurini, F. Bufano (+2 others)
2021 arXiv   pre-print
Innovative developments in data processing, archiving, analysis, and visualization are nowadays unavoidable to deal with the data deluge expected in next-generation facilities for radio astronomy, such  ...  To this aim, we are developing a visual analytic platform (CIRASA) for advanced source finding and classification, integrating state-of-the-art tools, such as the CAESAR source finder, the ViaLactea Visual  ...  Acknowledgements Part of the research leading to these results has received funding from INAF under the PRIN TEC programme (CIRASA) and from the European Commissions Horizon 2020 research and innovation  ... 
arXiv:2110.08211v2 fatcat:cvkt47mqsbg5hlfc5evciguhwq

Detecting dispersed radio transients in real time using convolutional neural networks

D. Ruhe, M. Kuiack, A. Rowlinson, R. Wijers, P. Forré
2021 Astronomy and Computing  
Accordingly, we would like to thank the scientific software development community, without whom this work would not be possible. This work was fully funded by the University of Amsterdam, Netherlands.  ...  This weight filter is then learned, extracting relevant features from the image.  ...  Note that PySE takes around 2 s to complete the analysis for one image (single band) on our system (see Section 3.5).  ... 
doi:10.1016/j.ascom.2021.100512 fatcat:2aoodk4cnvfqtnke4ds4wr67je

Detecting Dispersed Radio Transients in Real Time Using Convolutional Neural Networks [article]

David Ruhe, Mark Kuiack, Antonia Rowlinson, Ralph Wijers, Patrick Forré
2021 arXiv   pre-print
We present a methodology for automated real-time analysis of a radio image data stream with the goal to find transient sources.  ...  Experimentally, the pipeline is applied to simulated data and images from AARTFAAC (Amsterdam Astron Radio Transients Facility And Analysis Centre), a transients facility based on the Low-Frequency Array  ...  Accordingly, we would like to thank the scientific software development community, without whom this work would not be possible. This work was fully funded by the University of Amsterdam.  ... 
arXiv:2103.15418v3 fatcat:tulz4psqlbdudg3fztsxxgdybq

RFI flagging implications for short-duration transients

Y. Cendes, P. Prasad, A. Rowlinson, R.A.M.J. Wijers, J.D. Swinbank, C.J. Law, A.J. van der Horst, D. Carbone, J.W. Broderick, T.D. Staley, A.J. Stewart, F. Huizinga (+15 others)
2018 Astronomy and Computing  
transients from the data stream before imaging.  ...  Abstract With their wide fields of view and often relatively long coverage of any position in the sky in imaging survey mode, modern radio telescopes provide a data stream that is naturally suited to searching  ...  We would also like to thank Andre Offringa for answering some initial questions.  ... 
doi:10.1016/j.ascom.2018.04.001 fatcat:hlk6d3awdzbozcyxuo6xdffen4

RFI Flagging Implications for Short-Duration Transients [article]

Y. Cendes, P. Prasad, A. Rowlinson, R.A.M.J. Wijers, J.D. Swinbank, C.J. Law, A.J. van der Horst, D. Carbone, J.W. Broderick, T.D. Staley, A.J. Stewart, F. Huizinga, G. Molenaar (+14 others)
2018 arXiv   pre-print
transients from the data stream before imaging.  ...  With their wide fields of view and often relatively long coverage of any position in the sky in imaging survey mode, modern radio telescopes provide a data stream that is naturally suited to searching  ...  We would also like to thank Andre Offringa for answering some initial questions.  ... 
arXiv:1804.04708v1 fatcat:jgkz4z2ujjgsdocuxxuhjucvsi

The AARTFAAC 60 MHz transients survey [article]

Mark Kuiack, Ralph A.M.J. Wijers, Aleksandar Shulevski, Antonia Rowlinson, Folkert Huizinga, Gijs Molenaar, Peeyush Prasad
2020 arXiv   pre-print
, for 545 h.  ...  Lastly, we constrain some previously detected types of transient source by comparing our detections and limits with other low-frequency radio transient surveys.  ...  We use data obtained from LOFAR, the Low Frequency Array designed and constructed by ASTRON, which has facilities in several countries, that are owned by various parties (each with their own funding sources  ... 
arXiv:2003.13289v1 fatcat:yuz2qswzwvcsxnewtlg6ai2lmq

Searching for low radio-frequency gravitational wave counterparts in wide-field LOFAR data

K Gourdji, A Rowlinson, R A M J Wijers, J W Broderick, A Shulevski, P G Jonker
2021 Monthly notices of the Royal Astronomical Society  
In this study, we present a strategy to search for compact object merger radio counterparts in wide-field data collected by the Low-Frequency Array (LOFAR).  ...  This likely has to do with subtleties in the source extraction step and we note that TRAP uses a different source extraction tool ( PYSE; Carbone et al. 2018 ) than is used for TGSS ( PYBDSF; Mohan  ...  TRAP identifies common sources between images and, if a source that is extracted in the second or third image is not matched to a source from an earlier image, it is flagged as a new source.  ... 
doi:10.1093/mnras/stab3197 fatcat:66sxy2uwdfdzbnngk3m3epn2mm

Source finding in linear polarization for LOFAR, and SKA predecessor surveys, using Faraday moments

J S Farnes, G Heald, H Junklewitz, D D Mulcahy, M Haverkorn, C L Van Eck, C J Riseley, M Brentjens, C Horellou, V Vacca, D I Jones, A Horneffer (+1 others)
2017 Monthly notices of the Royal Astronomical Society  
We find that the technique can reduce the number of pixels on which RM Synthesis needs to be performed by a factor of ≈1×10^5 for source distributions anticipated with modern radio telescopes.  ...  The optimal source-finding strategy for linear polarization data is an unsolved problem, with many inhibitive factors imposed by the technically-challenging nature of polarization observations.  ...  For images from radio telescopes, a signal essentially fills the entire sky.  ... 
doi:10.1093/mnras/stx2915 fatcat:hb7do7ptujgi7loda33z3c6xgi

LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole

A. J. Stewart, R. P. Fender, J. W. Broderick, T. E. Hassall, T. Muñoz-Darias, A. Rowlinson, J. D. Swinbank, T. D. Staley, G. J. Molenaar, B. Scheers, T. L. Grobler, M. Pietka (+90 others)
2015 Monthly notices of the Royal Astronomical Society  
We present the results of a four-month campaign searching for low-frequency radio transients near the North Celestial Pole with the Low-Frequency Array (LOFAR), as part of the Multifrequency Snapshot Sky  ...  The campaign data were also searched for transients at a range of other time-scales, from 0.5 to 297 min, which allowed us to place a range of limits on transient rates at 60 MHz as a function of observation  ...  The authors would also like to thank Rachel Osten for helpful discussions during the project, along with the anonymous referee for their insightful comments and suggestions that improved the presentation  ... 
doi:10.1093/mnras/stv2797 fatcat:f3horxzy7bgjxk7nym5uglbyk4

Up and Down the Black Hole Radio/X-Ray Correlation: The 2017 Mini-outbursts from Swift J1753.5−0127

R. M. Plotkin, J. Bright, J. C. A. Miller-Jones, A. W. Shaw, J. A. Tomsick, T. D. Russell, G.-B. Zhang, D. M. Russell, R. P. Fender, J. Homan, P. Atri, F. Bernardini (+11 others)
2017 Astrophysical Journal  
Our campaign includes the lowest luminosity quasi-simultaneous radio/X-ray detection to date for a black hole X-ray binary during its rise out of quiescence, thanks to early notification from optical monitoring  ...  We discuss implications for the existence of a single radio/X-ray luminosity correlation for black hole X-ray binaries at the lowest luminosities (Lx < 1e35 erg/s), and we compare to supermassive black  ...  To extract flux measurements, we used the PYTHON-based source extractor PYSE, which was developed as part of the LOFAR Transient Pipeline (TRAP; Swinbank et al. 2015) .  ... 
doi:10.3847/1538-4357/aa8d6d fatcat:h4wqryhx5za77hb77ex6rln4ha
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