GRB 191016A: The onset of the forward shock and evidence of late energy injection
Por:
Pereyra, M., Fraija, N., Watson, A. M., Becerra, R. L., Butler, N. R., De Colle, F., Troja, E., Dichiara, S., Fraire-Bonilla, E., Lee, W. H., Ramirez-Ruiz, E., Bloom, J. S., Prochaska, J. X., Kutyrev, A. S., Gonzalez, J. J., Richer, M. G.
Publicada:
12 mar 2022
Resumen:
We present optical and near-infrared (NIR) photometric observations of
GRB 191016 with the COATLI,DDOTI, and RATIR ground-based telescopes over
the first three nights. We present the temporal evolution of the optical
afterglow and describe five different stages that were not completely
characterized in previous works, mainly due to scarcity of data points
to accurately fit the different components of the optical emission.
After the end of the prompt gamma-ray emission, we observed the
afterglow rise slowly in the optical and NIR wavelengths and peak at
around T + 1450 s in all filters. This was followed by an early decay, a
clear plateau from T + 5000 s to T + 11 000 s, and then a regular late
decay. We also present evidence of the jet break at later times, with a
temporal index in good agreement with the temporal slope obtained from
X-ray observations. Although many of the features observed in the
optical light curves of gamma-ray bursts are usually well explained by a
reverse shock (RS) or forward shock (FS), the shallowness of the optical
rise and enhanced peak emission in the GRB 191016A afterglow is not well
fitted by only a FS or a RS. We propose a theoretical model which
considers both of these components and combines an evolving FS with a
later embedded RS and a subsequent late energy injection from the
central engine activity. We use this model to successfully explain the
temporal evolution of the light curves and discuss its implications on
the fireball properties.
Filiaciones:
Pereyra, M.:
(Corresponding Author), Univ Nacl Autonoma Mexico, Inst Astron, Unidad Acad Ensenada, CONACYT, Ensenada 22860, Baja California, Mexico
Univ Nacl Autonoma Mexico, Inst Astron, Unidad Acad Ensenada, CONACYT, Ensenada 22860, Baja California, Mexico
Fraija, N.:
Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Cdmx 04510, Mexico
Watson, A. M.:
Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Cdmx 04510, Mexico
Becerra, R. L.:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-264, Cdmx 04510, Mexico
Butler, N. R.:
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
De Colle, F.:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-264, Cdmx 04510, Mexico
Troja, E.:
Univ Maryland, Dept Astron, College Pk, MD 20742 USA
NASA, Astrophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
Dichiara, S.:
Univ Maryland, Dept Astron, College Pk, MD 20742 USA
NASA, Astrophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
Fraire-Bonilla, E.:
Univ Autonoma Nuevo Leon, Fac Ciencias Fis Matemat, Monterrey 66451, NL, Mexico
Lee, W. H.:
Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Cdmx 04510, Mexico
Ramirez-Ruiz, E.:
Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA
Bloom, J. S.:
Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
Prochaska, J. X.:
Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA
Kutyrev, A. S.:
NASA, Astrophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
Gonzalez, J. J.:
Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Cdmx 04510, Mexico
Richer, M. G.:
Univ Nacl Autonoma Mexico, Inst Astron, Unidad Acad Ensenada, Ensenada 22860, Baja California, Mexico
Green Submitted, All Open Access; Green
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