Landing page for project GG088

GRB221009A is the brightest gamma-ray burst (GRB) ever detected. Located at redshift z=0.151, it represents the perfect candidate to measure the apparent superluminal expansion of the emitting region. Our VLBI campaign, comprising EVN, VLBA and global-VLBI observations at 5, 8 and 15 GHz, enabled us to measure the size of the source, and to reveal the apparent expansion for the second time ever, after GRB030329A. With this proposal, we ask for a third, global-VLBI observation to continue the monitoring of GRB221009A at high angular resolution. Combining all the observations, we will use the size growth to (i) constrain the expansion rate, (ii) infer the position of the termination shock radius and (iii) derive the global and microphysical parameters governing the long lasting afterglow emission by modelling its light curve and spectra self-consistently, accounting for size information from VLBI.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197