scholarly journals A GPU based single-pulse search pipeline (GSP) with database and its application to the Commensal Radio Astronomy FAST Survey (CRAFTS)

2022 ◽  
Vol 21 (12) ◽  
pp. 314
Author(s):  
Shan-Ping You ◽  
Pei Wang ◽  
Xu-Hong Yu ◽  
Xiao-Yao Xie ◽  
Di Li ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Data Streams ◽  
Single Pulse ◽  
Wide Band ◽  
Radio Bursts ◽  
Learning Tools ◽  
Radio Pulsars ◽  
Real Time Processing ◽  
Radio Transients ◽  
Rotating Radio Transients

Abstract We developed a GPU based single-pulse search pipeline (GSP) with a candidate-archiving database. Largely based upon the infrastructure of the open source PulsaR Exploration and Search Toolkit (PRESTO), GSP implements GPU acceleration of the de-dispersion and integrates a candidate-archiving database. We applied GSP to the data streams from the Commensal Radio Astronomy FAST Survey (CRAFTS), which resulted in quasi-real-time processing. The integrated candidate database facilitates synergistic usage of multiple machine-learning tools and thus improves efficient identification of radio pulsars such as rotating radio transients (RRATs) and fast radio bursts (FRBs). We first tested GSP on pilot CRAFTS observations with the FAST Ultra-Wide Band (UWB) receiver. GSP detected all pulsars known from the the Parkes multibeam pulsar survey in the corresponding sky area covered by the FAST-UWB. GSP also discovered 13 new pulsars. We measured the computational efficiency of GSP to be ∼120 times faster than the original PRESTO and ∼60 times faster than an MPI-parallelized version of PRESTO.

scholarly journals The Thousand-Pulsar-Array programme on MeerKAT – I. Science objectives and first results

2020 ◽  
Vol 493 (3) ◽  
pp. 3608-3615 ◽  
Author(s):  
Simon Johnston ◽  
A Karastergiou ◽  
M J Keith ◽  
X Song ◽  
P Weltevrede ◽  
...  
Keyword(s):  
Radio Emission ◽  
Single Pulse ◽  
Wide Band ◽  
Radio Pulsars ◽  
Pulse Trains ◽  
First Results ◽  
Dispersion Measures ◽  
Large Survey ◽  
First Time

ABSTRACT We report here on initial results from the Thousand-Pulsar-Array (TPA) programme, part of the Large Survey Project ‘MeerTime’ on the MeerKAT telescope. The interferometer is used in the tied-array mode in the band from 856 to 1712 MHz, and the wide band coupled with the large collecting area and low receiver temperature make it an excellent telescope for the study of radio pulsars. The TPA is a 5 year project, which aims at to observing (a) more than 1000 pulsars to obtain high-fidelity pulse profiles, (b) some 500 of these pulsars over multiple epochs, and (c) long sequences of single-pulse trains from several hundred pulsars. The scientific outcomes from the programme will include the determination of pulsar geometries, the location of the radio emission within the pulsar magnetosphere, the connection between the magnetosphere and the crust and core of the star, tighter constraints on the nature of the radio emission itself, as well as interstellar medium studies. First, results presented here include updated dispersion measures, 26 pulsars with Faraday rotation measures derived for the first time, and a description of interesting emission phenomena observed thus far.

scholarly journals PALFA Single-pulse Pipeline: New Pulsars, Rotating Radio Transients, and a Candidate Fast Radio Burst

2018 ◽  
Vol 869 (2) ◽  
pp. 181 ◽  
Author(s):  
C. Patel ◽  
D. Agarwal ◽  
M. Bhardwaj ◽  
M. M. Boyce ◽  
A. Brazier ◽  
...  
Keyword(s):  
Radio Burst ◽  
Single Pulse ◽  
Fast Radio Burst ◽  
Radio Transients ◽  
Rotating Radio Transients

scholarly journals The hunt for new pulsars with the Green Bank Telescope

2012 ◽  
Vol 8 (S291) ◽  
pp. 41-46
Author(s):  
Ryan S. Lynch
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Radio Pulsars ◽  
Large Area ◽  
Pulsar Timing ◽  
Drift Scan ◽  
Radio Transients ◽  
Pulsar Searches ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractThe Green Bank Telescope (GBT) is the largest fully steerable radio telescope in the world and is one of our greatest tools for discovering and studying radio pulsars. Over the last decade, the GBT has successfully found over 100 new pulsars through large-area surveys. Here I discuss the two most recent—the GBT 350 MHz Drift-scan survey and the Green Bank North Celestial Cap survey. The primary science goal of both surveys is to find interesting individual pulsars, including young pulsars, rotating radio transients, exotic binary systems, and especially bright millisecond pulsars (MSPs) suitable for inclusion in Pulsar Timing Arrays, which are trying to directly detect gravitational waves. These two surveys have combined to discover 85 pulsars to date, among which are 14 MSPs and many unique and fascinating systems. I present highlights from these surveys and discuss future plans. I also discuss recent results from targeted GBT pulsar searches of globular clusters and Fermi sources.

scholarly journals A search for rotating radio transients and fast radio bursts in the Parkes high-latitude pulsar survey

2015 ◽  
Vol 455 (2) ◽  
pp. 2207-2215 ◽  
Author(s):  
A. Rane ◽  
D. R. Lorimer ◽  
S. D. Bates ◽  
N. McMann ◽  
M. A. McLaughlin ◽  
...  
Keyword(s):  
High Latitude ◽  
Radio Bursts ◽  
Radio Transients ◽  
Rotating Radio Transients

scholarly journals First Discovery of New Pulsars and RRATs with CHIME/FRB

2021 ◽  
Vol 922 (1) ◽  
pp. 43
Author(s):  
D. C. Good ◽  
B. C. Andersen ◽  
P. Chawla ◽  
K. Crowter ◽  
F. Q. Dong ◽  
...  
Keyword(s):  
Radio Burst ◽  
Single Pulse ◽  
Radio Sources ◽  
Pulse Emission ◽  
Intensity Mapping ◽  
Fast Radio Burst ◽  
Radio Transients ◽  
Galactic Sources ◽  
Rotating Radio Transients ◽  
Galactic Radio

Abstract We report the discovery of seven new Galactic pulsars with the Canadian Hydrogen Intensity Mapping Experiment’s Fast Radio Burst (CHIME/FRB) backend. These sources were first identified via single pulses in CHIME/FRB, then followed up with CHIME/Pulsar. Four sources appear to be rotating radio transients, pulsar-like sources with occasional single-pulse emission with an underlying periodicity. Of those four sources, three have detected periods ranging from 220 ms to 2.726 s. Three sources have more persistent but still intermittent emission and are likely intermittent or nulling pulsars. We have determined phase-coherent timing solutions for the latter two. These seven sources are the first discovery of previously unknown Galactic sources with CHIME/FRB and highlight the potential of fast radio burst detection instruments to search for intermittent Galactic radio sources.

scholarly journals Radio Properties of Rotating Radio Transients: Single-pulse Spectral and Wait-time Analyses

2018 ◽  
Vol 866 (2) ◽  
pp. 152
Author(s):  
B. J. Shapiro-Albert ◽  
M. A. McLaughlin ◽  
E. F. Keane
Keyword(s):  
Wait Time ◽  
Single Pulse ◽  
Radio Transients ◽  
Rotating Radio Transients

scholarly journals Charting the Transient Radio Sky on Sub-Second Time-Scales with LOFAR

2011 ◽  
Vol 7 (S285) ◽  
pp. 104-104
Author(s):  
J. W. T. Hessels ◽  
Keyword(s):  
Time Scales ◽  
Low Frequency ◽  
Radio Bursts ◽  
Radio Telescopes ◽  
Dynamic Nature ◽  
Transient Sources ◽  
Fast Transients ◽  
Radio Transients ◽  
The Universe ◽  
Rotating Radio Transients

SummaryThe LOw Frequency ARray (LOFAR) is a radio interferometric telescope that promises to open a largely unexplored window on transient sources in the “radio sky”, from time-scales of nanoseconds to years. An important aspect of this will be the study of radio-emitting neutron stars in their various incarnations: slow pulsars, young pulsars, millisecond pulsars, magnetars, rotating radio transients, intermittent pulsars, et cetera. Pulsars and their brethren are the prototype of the more general “fast transients”: sub-second, dispersed radio bursts which point the way to extreme, and potentially still unknown, phenomena. For instance, prompt radio bursts from supernovæ and other extra-galactic bursts have been hypothesized; these could prove to be powerful cosmological probes.This talk discussed LOFAR's impressive ability to observe pulsars and to enlarge greatly the discovery space for (even rarer) fast transients. It also presented the latest pulsar observations made during LOFAR's commissioning period. These are demonstrating powerful observing techniques that will be crucial for the next generation of radio telescopes as well as the effort to increase our understanding of the dynamic nature of the Universe.An expanded version of the talk can be found at http://adsabs.harvard.edu/abs/2011A

Erratum: “Timing Solution and Single-pulse Properties for Eight Rotating Radio Transients” (2017, ApJ, 840, 5)

2017 ◽  
Vol 848 (1) ◽  
pp. 72
Author(s):  
B.-Y. Cui ◽  
J. Boyles ◽  
M. A. McLaughlin ◽  
N. Palliyaguru
Keyword(s):  
Single Pulse ◽  
Radio Transients ◽  
Rotating Radio Transients

scholarly journals The emission and scintillation properties of RRAT J2325−0530 at 154 MHz and 1.4 GHz

2019 ◽  
Vol 36 ◽  
Author(s):  
B. W. Meyers ◽  
S. E. Tremblay ◽  
N. D. R. Bhat ◽  
R. M. Shannon ◽  
S. M. Ord ◽  
...  
Keyword(s):  
Simultaneous Detection ◽  
Low Frequency ◽  
Single Pulse ◽  
Time Sampling ◽  
Energy Distributions ◽  
New Class ◽  
Broadband Emission ◽  
Murchison Widefield Array ◽  
Radio Transients ◽  
Rotating Radio Transients

AbstractRotating Radio Transients (RRATs) represent a relatively new class of pulsar, primarily characterised by their sporadic bursting emission of single pulses on time scales of minutes to hours. In addition to the difficulty involved in detecting these objects, low-frequency ( $ \lt 300\,\text{MHz}$ ) observations of RRATs are sparse, which makes understanding their broadband emission properties in the context of the normal pulsar population problematic. Here, we present the simultaneous detection of RRAT J2325−0530 using the Murchison Widefield Array (154 MHz) and Parkes radio telescope ( $1.4\,\text{GHz}$ ). On a single-pulse basis, we produce the first polarimetric profile of this pulsar, measure the spectral index ( $\alpha={-2.2\pm 0.1}$ ), pulse energy distributions, and present the pulse rates in the context of detections in previous epochs. We find that the distribution of time between subsequent pulses is consistent with a Poisson process and find no evidence of clustering over the $\sim\!1.5\,\text{h}$ observations. Finally, we are able to quantify the scintillation properties of RRAT J2325−0530 at 1.4 GHz, where the single pulses are modulated substantially across the observing bandwidth, and show that this characterisation is feasible even with irregular time sampling as a consequence of the sporadic emission behaviour.

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