Properties of GRBs high-energy gamma-emission according to Fermi/LAT, CORONAS-F/ABC-F and PHOTON/NATALYA-2M data

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Abstract

The AVS-F catalogue contains several tens of GRBs, the one of NATALYA-2M consists of 6 objects (maximum photon energy ∼150 and ∼60 MeV, respectively). The Fermi/LAT catalogue contains more than 200 bursts in the range E > 100 MeV. Different behavior of the prompt emission time profiles is observed in the high and low energy ranges during some events with the presence of a high-energy spectral component. When using the parameter Rt (the ratio of the arrival time of photon with maximum energy to the duration of the burst) that does not require taking into account cosmological duration dilation, the following groups are distinguished among long bursts: (1) for ∼25% of GRBs the duration of high-energy emission is shorter than that of low-energy range; (2) for the remaining ∼75% the opposite situation is observed, but the maximum energy γ is detected during the low-energy prompt emission (2a) or after its completion (2b). The characteristics of GRBs with γ in the sub-TeV region are similar to types 2a and 2b, there is no significant correlation between their maximum energy and redshift.

About the authors

I. V Arkhangelskaja

NRNU MEPhI

Email: IVArkhangelskaya@mephi.ru
Moscow, Russia

A. I Arkhangelskiy

NRNU MEPhI

Moscow, Russia

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