GRB 180620A: Evidence for Late-time Energy Injection

Becerra, R. L.; De Colle, F.; Watson, A. M.; Fraija, N.; Butler, N. R.; Lee, W. H.; Román-Zúñiga, C. G.; Bloom, J. S.; González, J. J.; Kutyrev, A. S.; Prochaska, J. X.; Ramirez-Ruiz, E.; Richer, M. G.; Troja, E.

doi:10.3847/1538-4357/ab5859

Title: GRB 180620A: Evidence for Late-time Energy Injection

Journal Article · 26 December 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab5859 · OSTI ID:1603563

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^[1]; Watson, A. M. ^[1];

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^[2]; Lee, W. H. ^[1];

^[1]; Bloom, J. S. ^[3];

^[1]; Kutyrev, A. S. ^[4];

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Univ. Nacional Autónoma de México, Mexico City (Mexico)
Arizona State Univ., Tempe, AZ (United States)
Univ. of California, Berkeley, CA (United States)
Space Telescope Science Inst., Baltimore, MD (United States)
Univ. of California, Santa Cruz, CA (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)

The early optical emission of gamma-ray bursts (GRBs) gives an opportunity to understand the central engine and first stages of these events. About 30% of GRBs present flares whose origin is still a subject of discussion. We present optical photometry of GRB 180620A with the COATLI telescope and RATIR instrument. COATLI started to observe from the end of prompt emission at T + 39.3 s and RATIR from T + 121.4 s. We supplement the optical data with the X-ray light curve from Swift/XRT. We observe an optical flare from T + 110 s to T + 550 s, with a temporal index decay α O,decay = 1.32 ± 0.01, and Δt/t = 1.63, which we interpret as the signature of a reverse shock component. After the initial normal decay the light curves show a long plateau from T + 500 s to T + 7800 s in both X-rays and the optical before decaying again after an achromatic jet break at T + 7800 s. Fluctuations are seen during the plateau phase in the optical. Adding to the complexity of GRB afterglows, the plateau phase (typically associated with the coasting phase of the jet) is seen in this object after the "normal" decay phase (associated with the deceleration phase of the jet), and the jet break phase occurs directly after the plateau. Finally, we suggest that this sequence of events can be explained by a rapid deceleration of the jet with t _d ≲ 40 s due to the high density of the environment (≈100 cm^-3) followed by reactivation of the central engine, which causes the flare and powers the plateau phase.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); NASA; CONACyT; UNAM PAPIIT; UC MEXUS-CONACyT

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1603563

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 887; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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gamma-ray burst
gamma-ray bursters
gamma-ray sources
optical telescopes

Title: GRB 180620A: Evidence for Late-time Energy Injection

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