TY - JOUR
T1 - Photometric and Spectroscopic Observations of GRB 190106A
T2 - Emission from Reverse and Forward Shocks with Late-time Energy Injection
AU - Zhu, Zi Pei
AU - Xu, Dong
AU - Fynbo, Johan P.U.
AU - Fu, Shao Yu
AU - Zhang, Jun Bo
AU - Liu, Xing
AU - Jiang, Shuai Qing
AU - Xiao, Shuo
AU - Xie, Wei
AU - Zou, Yuan Chuan
AU - Gao, He
AU - Hartmann, Dieter
AU - de Ugarte Postigo, Antonio
AU - Kann, David Alexander
AU - Valle, Massimo Della
AU - Jakobsson, Páll
AU - Zafar, Tayabba
AU - D’Elia, Valerio
AU - Xin, Li Ping
AU - Wei, Jian Yan
AU - Gao, Xing
AU - Liu, Jin Zhong
AU - Lu, Tian Hua
AU - Lei, Wei Hua
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/5/1
Y1 - 2023/5/1
N2 - Early optical observations of gamma-ray bursts can significantly contribute to the study of the central engine and physical processes therein. However, of the thousands observed so far, only a few have data at optical wavelengths in the first minutes after the onset of the prompt emission. Here we report on GRB 190106A, whose afterglow was observed in optical bands just 36 s after the Swift/BAT trigger, i.e., during the prompt emission phase. The early optical afterglow exhibits a bimodal structure followed by a normal decay, with a faster decay after ∼T 0 + 1 day. We present optical photometric and spectroscopic observations of GRB 190106A. We derive the redshift via metal absorption lines from Xinglong 2.16 m/BFOSC spectroscopic observations. From the BFOSC spectrum, we measure z = 1.861 ± 0.002. The double-peak optical light curve is a significant feature predicted by the reverse-forward external-shock model. The shallow decay followed by a normal decay in both the X-ray and optical light curves is well explained with the standard forward-shock model with late-time energy injection. Therefore, GRB 190106A offers a case study for GRB emission from both reverse and forward shocks.
AB - Early optical observations of gamma-ray bursts can significantly contribute to the study of the central engine and physical processes therein. However, of the thousands observed so far, only a few have data at optical wavelengths in the first minutes after the onset of the prompt emission. Here we report on GRB 190106A, whose afterglow was observed in optical bands just 36 s after the Swift/BAT trigger, i.e., during the prompt emission phase. The early optical afterglow exhibits a bimodal structure followed by a normal decay, with a faster decay after ∼T 0 + 1 day. We present optical photometric and spectroscopic observations of GRB 190106A. We derive the redshift via metal absorption lines from Xinglong 2.16 m/BFOSC spectroscopic observations. From the BFOSC spectrum, we measure z = 1.861 ± 0.002. The double-peak optical light curve is a significant feature predicted by the reverse-forward external-shock model. The shallow decay followed by a normal decay in both the X-ray and optical light curves is well explained with the standard forward-shock model with late-time energy injection. Therefore, GRB 190106A offers a case study for GRB emission from both reverse and forward shocks.
UR - http://www.scopus.com/inward/record.url?scp=85158041310&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/acbd96
DO - 10.3847/1538-4357/acbd96
M3 - Article
AN - SCOPUS:85158041310
SN - 0004-637X
VL - 948
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 30
ER -