HEASA 2026 (29 Sep - 02 Oct)

Session

Transients 1

30 Sept 2026, 15:00

Description

Chair: Soebur Razzaque

11. The Spectral & Temporal Extremes of Gamma-Ray Bursts

Alexander van der Horst (The George Washington University)

30/09/2026, 15:00

GRBs, FRBs and other Transients

Invited Talk

Gamma-ray bursts are the most extreme cosmic explosions, emitting across the electromagnetic spectrum and detected on timescales from milliseconds to years. Modeling the multi-wavelength, multi-timescale observations of gamma-ray burst afterglows leads to insights into the macrophysics of the relativistic outflows and their environments, and the microphysics of the particles and magnetic...

65. A transient search pipeline for the Transient Array Radio Telescope (TART)

Shain Mukungu (University of Namibia)

30/09/2026, 15:31

GRBs, FRBs and other Transients

Dissertation Talk

Searching for transient events in data taken with the transient array radio telescope (TART) is a challenging task. Localising an actual transient event and ruling out that it is not some kind of radio interference source, all without knowing in advance where or when to look, has been the main cause of the challenge. The TART is a low-cost all-sky interferometer of 24 antennas operating at a...

28. A search for and modelling of persistent radio sources associated with Fast Radio Bursts.

Ms Lebogang Mfulwane (Centre for Space Research, North-West University,)

30/09/2026, 15:44

GRBs, FRBs and other Transients

Contributed Talk

Fast Radio Bursts (FRBs) are bright, extra-galactic, millisecond-duration transients whose physical origin is still unknown. Luminous compact persistent radio sources (PRSs) have been found to be co-located with a subset of repeating FRBs in some cases. Studying the PRSs may provide clues about the immediate environments of the FRBs, which in turn may reveal the nature of FRB sources. However,...

20. Constraining Jet Structure in Low-Luminosity Gamma-Ray Bursts: A Comparative Analysis of Top-Hat and Gaussian Jets in GRB 171205A

Godson Abbey (The Copperbelt University Zambia.)

30/09/2026, 15:57

GRBs, FRBs and other Transients

Contributed Talk

We present a comprehensive multiwavelength afterglow analysis of the nearby LL GRBs GRB~171205A ($z=0.0368$), associated with SN~2017iuk, to constrain its underlying jet structure. Using the standard synchrotron external forward shock framework and Markov Chain Monte Carlo (MCMC) methods, we perform a comparative study of two distinct jet geometries---the canonical top-hat jet and the smoothly...

19. Revisiting Lorentz-factor constraints in blazars and gamma-ray bursts based on polarization-dependent gamma-gamma absorption

Denzel Mkhwanazi (Northwest Univeristy)

30/09/2026, 16:10

GRBs, FRBs and other Transients

Contributed Talk

Gamma-ray bursts (GRBs: seconds to minutes long flashes of gamma-rays, probably resulting
from either the collapse of a very massive star or from the merger of a neutron star
with another neutron star or a black hole) and jetted active galactic nuclei (in
particular, blazars) are amongst the brightest sources of high-energy gamma-rays in
the Universe. It is well established that the...