GBT23B-198

Probing the dynamic environment of FRB20180301A

Abstract

Repeating Fast radio bursts (FRBs) provide a novel way to investigate the temporal evolution of the density profile and magnetic fields in the immediate environment of the burst progenitor. Monitoring such FRB sources with sensitive radio telescopes and wide frequency coverage allows for detailed studies of the spectro-polarimetric properties of the burst emission. We propose GBT Ultra-wideband observations to investigate the source of repeating FRB 20180301A. Multi-epoch observations with the Parkes radio telescope have revealed burst characteristics from this FRB source indicative of a dynamic progenitor environment. These properties include Faraday RM variation with a sign reversal, a secular decreasing trend in the observed DM, bursts with extremely narrow temporal widths ~100 us, and spectral depolarization at low frequencies ~1.2 GHz. The proposed sensitive observations with the new ultra-wideband receiver will probe the dynamic environment of the FRB source. The GBT wide-band polarimetric measurements will investigate the DM-RM evolutionary trend and detect upcoming Faraday RM sign reversals. The increased detection yield will allow us to determine whether such variations correlate with periodic modulations, which can be used to distinguish models involving binary systems.

Investigators

Name	Institution
Pravir Kumar *	Weizmann Institute of Science
Vishal Gajjar	California at Berkeley, University of
Rui Luo	Australia Telescope National Facility ; Commonwealth Scientific and Industrial Research Organisation
Danny Price	California at Berkeley, University of
Ryan Shannon	Swinburne University of Technology
Adam Deller	Swinburne University of Technology
Shivani Bhandari	Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium
Ryan Lynch	Green Bank Observatory
Hao Qiu	Square Kilometre Array
Steve Croft	California at Berkeley, University of
Pavan Uttarkar	Swinburne University of Technology
Andrew Siemion	California at Berkeley, University of; Netherlands Institute for Radio Astronomy; Nijmegen, Radboud Universiteit
Navin Sridhar	Columbia University; Indian Institute of Science Education and Research, Bhopal

* indicates the PI