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Very Long Baseline Interferometry with the SKA
Zsolt Paragi, Leith Godfrey, Cormac Reynolds +79
Adding VLBI capability to the SKA arrays will greatly broaden the science of the SKA, and is feasible within the current specifications. SKA-VLBI can be initially implemented by pr…
LOFAR Observations of Swift J1644+57 and Implications for Short-Duration Transients
Y. Cendes, R. A. M. J. Wijers, J. D. Swinbank +25
Aims: We have analyzed low frequency radio data of tidal disruption event (TDE) Swift J1644+57 to search for a counterpart. We consider how brief transient signals (on the order of…
Localization of Gamma-Ray Bursts using the Fermi Gamma-Ray Burst Monitor
V. Connaughton, M. S. Briggs, A. Goldstein +25
The Fermi Gamma-ray Burst Monitor (GBM) has detected over 1400 Gamma-Ray Bursts (GRBs) since it began science operations in July, 2008. We use a subset of over 300 GRBs localized b…
New methods to constrain the radio transient rate: results from a survey of four fields with LOFAR
D. Carbone, A. J. van der Horst, R. A. M. J. Wijers +23
We report on the results of a search for radio transients between 115 and 190\,MHz with the LOw-Frequency ARray (LOFAR). Four fields have been monitored with cadences between 15 mi…
Broadband modelling of short gamma-ray bursts with energy injection from magnetar spin-down and its implications for radio detectability
B. P. Gompertz, A. J. van der Horst, P. T. O'Brien +2
The magnetar model has been proposed to explain the apparent energy injection in the X-ray light curves of short gamma-ray bursts (SGRBs), but its implications across the full broa…
GRB 080517: A local, low luminosity GRB in a dusty galaxy at z=0.09
E. R. Stanway, A. J. Levan, N. R. Tanvir +4
We present an analysis of the photometry and spectroscopy of the host galaxy of Swift-detected GRB 080517. From our optical spectroscopy, we identify a redshift of z = 0.089 +/- 0.…
Circular polarization in the optical afterglow of GRB 121024A
K. Wiersema, S. Covino, K. Toma +37
Gamma-ray bursts (GRBs) are most probably powered by collimated relativistic outflows (jets) from accreting black holes at cosmological distances. Bright afterglows are produced wh…
The LOFAR Pilot Surveys for Pulsars and Fast Radio Transients
Thijs Coenen, Joeri van Leeuwen, Jason W. T. Hessels +87
We have conducted two pilot surveys for radio pulsars and fast transients with the Low-Frequency Array (LOFAR) around 140 MHz and here report on the first low-frequency fast-radio…
Detailed Afterglow Modeling and Host Galaxy Properties of the Dark GRB 111215A
A. J. van der Horst, A. J. Levan, G. G. Pooley +13
Gamma-ray burst (GRB) 111215A was bright at X-ray and radio frequencies, but not detected in the optical or near-infrared (nIR) down to deep limits. We have observed the GRB afterg…
Initial LOFAR observations of Epoch of Reionization windows: II. Diffuse polarized emission in the ELAIS-N1 field
V. Jelic, A. G. de Bruyn, M. Mevius +106
This study aims to characterise the polarized foreground emission in the ELAIS-N1 field and to address its possible implications for the extraction of the cosmological 21-cm signal…
Constraining properties of GRB magnetar central engines using the observed plateau luminosity and duration correlation
A. Rowlinson, B. P. Gompertz, M. Dainotti +3
An intrinsic correlation has been identified between the luminosity and duration of plateaus in the X-ray afterglows of Gamma-Ray Bursts (GRBs; Dainotti et al. 2008), suggesting a…
Quasi-Periodic Oscillations in Short Recurring Bursts of the Soft-Gamma Repeater J1550-5418
Daniela Huppenkothen, Caroline D'Angelo, Anna L. Watts +11
The discovery of quasi-periodic oscillations (QPOs) in magnetar giant flares has opened up prospects for neutron star asteroseismology. The scarcity of giant flares makes a search…
A Comprehensive Radio View of the Extremely Bright Gamma-Ray Burst 130427A
A. J. van der Horst, Z. Paragi, A. G. de Bruyn +11
GRB 130427A was extremely bright as a result of occurring at low redshift whilst the energetics were more typical of high-redshift gamma-ray bursts (GRBs). We collected well-sample…
Probing the Bright Radio Flare and Afterglow of GRB 130427A with the Arcminute Microkelvin Imager
G. E. Anderson, A. J. van der Horst, T. D. Staley +7
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…
Time resolved spectroscopy of SGR J1550-5418 bursts detected with Fermi/GBM
G. Younes, C. Kouveliotou, A. J. van der Horst +18
We report on time-resolved spectroscopy of the 63 brightest bursts of SGR J1550-5418, detected with Fermi/Gamma-ray Burst Monitor during its 2008-2009 intense bursting episode. We…
High-Time-Resolution Measurements of the Polarization of the Crab Pulsar at 1.38 GHz
Agnieszka Slowikowska, Benjamin W. Stappers, Alice K. Harding +4
Using the Westerbork Synthesis Radio Telescope (WSRT), we obtained high-time-resolution measurements of the full (linear and circular) polarization of the Crab pulsar. Taken at a r…
The 2nd Fermi GBM Gamma-Ray Burst Catalog: The First Four Years
Andreas von Kienlin, Charles A. Meegan, William S. Paciesas +30
This is the second of a series of catalogs of gamma-ray bursts (GRBs) observed with the Fermi Gamma-ray Burst Monitor (GBM). It extends the first two-year catalog by two more years…
The Fermi GBM Gamma-Ray Burst Spectral Catalog: Four Years Of Data
David Gruber, Adam Goldstein, Victoria Weller von Ahlefeld +29
In this catalog we present the updated set of spectral analyses of GRBs detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first four years of operation. It contains tw…
Discovery of Carbon Radio Recombination Lines in absorption towards Cygnus~A
J. B. R. Oonk, R. J. van Weeren, F. Salgado +100
We present the first detection of carbon radio recombination line absorption along the line of sight to Cygnus A. The observations were carried out with the LOw Frequency ARray in…