Deciphering the ~18 TeV photons from the extraordinarily bright
gamma-ray burst GRB 221009A
Dr. Sarira Sahu, ICN-UNAM
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.
Liga de Zoom:
https://cuaieed-unam.zoom.us/j/84528020176?pwd=ODRubmFxN2V1UjAyYUJvTGRFbGxaQT09