Journal
ASTROPHYSICAL JOURNAL
Volume 882, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab33fe
Keywords
gamma-ray burst: general; gamma-ray burst: individual (GRB 160625B)
Categories
Funding
- National Natural Science Foundation of China [11773007, 11533003, 11673006, 11851304, U1731239]
- Guangxi Science Foundation [2018GXNSFFA281010, 2016GXNSFDA380027, 2018GXNSFDA281033, 2016GXNSFFA380006, 2017GXNSFBA198206, 2017AD22006, 2018GXNSFGA281005]
- Innovation Team and Outstanding Scholar Program in Guangxi Colleges
- One-Hundred-Talents Program of Guangxi colleges
- Innovation Project of Guangxi Graduate Education [YCSW2018050]
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Recent research shows that the spectral lag is closely related to the spectral evolution in gamma-ray bursts (GRBs). In this paper, we study the spectral lag for a radiating jet shell with a high-energy cutoff radiation spectrum. For the jet shell with a cutoff power-law spectrum, the spectral lag monotonically increases with the photon energy and levels off at a certain photon energy. It is the same for the jet shell with a Band cutoff spectrum (Bandcut). However, a turnover from the positive lags to negative lags appears in the high-energy range for the jet shell with a Bandcut, which is very similar to that observed in GRB 160625B. The dependence of the spectral lags on the spectral shape/evolution is studied in detail. In addition, the spectral lag behavior observed in GRB 160625B is naturally reproduced based on our theoretical outcome.
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