Effects of GRB221009A
Taken by Andrew Klekociuk on October 9, 2022 @
Kingston, Tasmania, Australia
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Details:
There was a short-lived decrease in the signal strength for a few of the VLF transmitters I monitor around 1321 UTC on 9 October. This appears to tally with the occurrence of the extremely bright flash from GRB221009A. I’m using an earth probe antenna, which response to the electric field in the earth-ionosphere waveguide. The high-energy emission from the event rapidly changed the properties of the ionosphere, leading to the signal decrease on paths exposed to the blast. Impressive for a source that seems to be about 2 billion light years away!
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