Published April 21, 2023
| Version v1
Publication
Optical and Near-infrared Observations of the Distant but Bright 'New Year's Burst' GRB 220101A
Creators
- Zhu, Zi-Pei
- Lei, Wei-Hua
- Malesani, Daniele B
- Fu, Shao-Yu
- Liu, Dong-Jie
- Xu, Dong
- d'Avanzo, Paolo
- Fernández, José Feliciano Agüí
- Fynbo, Johan P.U
- Gao, Xing
- Guelbenzu, Ana Nicuesa
- Jiang, Shuai-Qing
- Kann, David Alexander
- Klose, Sylvio
- Liu, Jin-Zhong
- Liu, Xing
- de Pasquale, Massimiliano
- de Ugarte Postigo, Antonio
- Stecklum, Bringfried
- Thöne, Christina
- Viuho, Joonas Kari Markku
- Zhu, Yi-Nan
- Li, Jing-Da
- Gao, He
- Lu, Tian-Hua
- Xiao, Shuo
- Zou, Yuan-Chuan
- Xin, Li-Ping
- Wei, Jian-Yan
Description
High-redshift gamma-ray bursts (GRBs) provide a powerful tool to probe the early universe, but still for relatively few do we have good observations of the afterglow. We here report the optical and near-infrared observations of the afterglow of a relatively high-redshift event, GRB 220101A, triggered on New Year's Day of 2022. With the optical spectra obtained at XL2.16/BFOSC and NOT/ALFOSC, we determine the redshift of the burst at $z= 4.615$. Based on our optical and near-infrared data, combined with the X-ray data, we perform multiband fit with the python package \emph{afterglowpy}. A jet-break at $\sim$ 0.7 day post-burst is found to constrain the opening angle of the jet as $\sim$ 3.4 degree. We also determine circumburst density of $n_0 = 0.15\ {\rm cm}^{-3}$ as well as kinetic energy $E_{\rm K, iso} = 3.52\times 10^{54}$ erg. The optical afterglow is among the most luminous ever detected. We also find a ``mirror'' feature in the lightcurve during the prompt phase of the burst from 80 s to 120 s. The physical origin of such mirror feature is unclear.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.science/hal-04076935
- URN
- urn:oai:HAL:hal-04076935v1