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- W4283206475 abstract "Abstract We present the broadband numerical modeling of afterglows for two remarkably bright long gamma-ray bursts (GRBs), GRB 050820A and GRB 070125, with a wide range of observations from the radio band to the X-ray band. In our work, we fit light curves and constrain physical parameters using a standard forward shock model from the afterglowpy Python package, considering different jet structures and the jet lateral expansion. For GRB 050820A, the constrained jet is close to a top-hat jet with an extremely small half opening angle of about 0.015 rad, and the circumburst matter density is as small as 10 −7 cm −3 , which suggests that this peculiar long GRB might originate from metal-poor stars with low mass-loss rates. To explain the late time optical light curves of GRB 070125, the effects of the lateral expansion and the participation factor of electrons that are accelerated by the shock have to be taken into account. The constrained results for GRB 070125 show that the jet is also close to a top-hat jet with a half opening angle of about 0.1 rad, the viewing angle is about 0.05 rad, the circumburst density is about 10 cm −3 , and the participation factor is about 0.1. The jet energy of the two bursts is required to be ∼10 51 –10 52 erg, which can be produced by a millisecond magnetar or a hyper-accreting black hole." @default.
- W4283206475 created "2022-06-22" @default.
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- W4283206475 date "2022-07-22" @default.
- W4283206475 modified "2023-09-24" @default.
- W4283206475 title "On the Jet Structures of GRB 050820A and GRB 070125" @default.
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- W4283206475 doi "https://doi.org/10.1088/1674-4527/ac7a98" @default.
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