Center for Astrophysics Research and Technologies Seminar Series
New Limits on Short GRBs from Radio Observations
Presented by Sarah Chastain, UNM
Gamma-ray bursts (GRBs) are among the most powerful explosive transients in the sky, accelerating electrons to extremely high Lorentz factors and emitting photons with up to TeV energies. Short GRBs are caused by binary mergers of compact objects, with some of them associated with kilonovae and one with a gravitational wave event. Following the GRB prompt gamma-ray emission, irrespective of the progenitor, an afterglow is observed across the electromagnetic spectrum, due to the interaction between the ejected material and the surrounding medium. Multiwavelength observations provide constraints on the physical parameters of the jet, its surrounding medium, and the microphysics of the enhanced magnetic fields and accelerated electrons in the blast wave at the front of the jet. Radio observations provide a particularly important role, since the synchrotron emission from GRB afterglows can be tracked and well defined over time, especially in the case of bright ones. As part of the ThunderKAT project we will present the results of eight SGRB observations with the MeerKAT radio telescope. Using these results we report one detected SGRB and deep upper limits that place constraints on the physical parameters and imply that deeper observations with future telescopes should be able to provide deeper insights into GRB afterglow physics.
2:00 pm, Thursday, September 7, 2023
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: email@example.com) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php