| 11th of June 2021 |
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| The afterglow of a TeV-bright Gamma-Ray Burst |
| by Misra et al. |
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Misra et al.
present radio and optical afterglow observations of the TeV-bright long Gamma Ray Burst
(GRB) 190114C at a redshift of 𝑧 = 0.425, which was detected by the MAGIC telescope.
Radio observations with ALMA, ATCA, and uGMRT made up to ∼140 days after the burst and optical observations
were made with three optical telescopes spanning up to ∼25 days after the burst. Long term
radio/mm observations reveal the complex nature of the afterglow, which does not follow the
spectral and temporal relations expected from the standard afterglow model.
The ATCA observed the afterglow over 13 epochs from 1.5 to 138 days after the GRB,
at frequencies ranging between 5.5 and 45 GHz.
The image above shows multi-band lightcurves of the afterglow of GRB 190114C from X-ray to the radio/mm bands
(note the scaling to offset bands vertically from each other)
The solid symbols represent data presented by Misra et al. and the light
shaded symbols represent the data from the literature.
They find that the microphysical parameters of the external forward shock
are evolving with time, in this burst which is one of only a handful
that have been detected in gamma-rays up to TeV energies.
The results will be published in
Monthly Notices of the Royal Astronomical Society.
As Monday is a public holiday in NSW, the next ADAP will appear on Tuesday 15th June. |