East Asia VLBI Network observations of the TeV Gamma-Ray Burst 190114C

Abstract

Observations of gamma-ray bursts (GRBs) at Very High Energy (VHE) offer a unique opportunity to investigate particle acceleration processes, magnetic fields and radiation fields in these events. Very Long Baseline Interferometry (VLBI) observations have been proven to be a powerful tool providing unique information on the source size of the GRBs at mas scales, as well as their accurate positions and possible expansion speeds. This paper reports on the follow-up observations of GRB 190114C, the first ever GRB detected with high significance at TeV photon energies by the MAGIC telescope, conducted with the East Asia VLBI Network (EAVN) at 22 GHz on three epochs, corresponding to 6, 15 and 32 days after the burst. The derived maps do not show any significant source above 5 sigma. The inferred upper limits on the GRB 190114C flux density at 22 GHz are used here to constrain the allowable two-dimensional parameter space for the afterglow emission. We find that our limits are consistent with most afterglow parameter combinations proposed so far in the literature. This is the first effort for the EAVN to search and monitor a radio transient in the Target of Opportunity mode. In addition to the useful constraints on GRB 190114C radio emission, experience gained from these observations is very helpful for future routine operation of EAVN transient program.

12 pages, 5 figures. Accepted by Science Bulletin

References in corpus (6)

• A Comprehensive Radio View of the Extremely Bright Gamma-Ray Burst 130427A
• High energy gamma-ray emission from Gamma-Ray Bursts -- before GLAST
• Analysis and modelling of the multi-wavelength observations of the luminous GRB 190114C
• Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales
• GRB 190114C: from prompt to afterglow?
• Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array

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• Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
• Methods for detection and analysis of weak radio sources with single-dish radio telescopes
• Jitter radiation: towards TeV-photons of gamma-ray bursts
• First Trigonometric Parallax Measurements with the KVN and VERA Array (KaVA)