ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Mar 16, 2023 (Thursday) 14:00


Sarira Sahu (Instituto de Ciencias Nucleares, UNAM, Mexico City): 
Deciphering the ~18 TeV photons from GRB 221009A


On 9 October, 2022, an extremely powerful gamma-ray burst, GRB 221009A, was 
detected by several instruments. Despite being obstructed by the Milky Way 
galaxy, its afterglow outburst outshone all other GRBs seen before. LHAASO 
detected several thousands very high energy photons extending up to 18 TeV. 
Detection of such energetic photons are unexpected due to the large opacity 
of the Universe. It is possible that in the afterglow epoch the intrinsic 
very high energy photon flux from the source might have increased manifolds, 
which could compensate the attenuation by pair-production with the 
extragalactic background light. We propose such a scenario and show that very 
high energy photons can be observed on the Earth from the interaction of very 
high energy protons with the seed synchrotron photons in the external forward 
shock region of the GRB jet.


The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265



Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/szeminar/szeminarium.shtml