Optical and Near-infrared observations of the distant but bright ''New Year's Burst'' GRB 220101A

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00604489" target="_blank" >RIV/67985815:_____/23:00604489 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0361906" target="_blank" >https://hdl.handle.net/11104/0361906</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad05c8" target="_blank" >10.3847/1538-4357/ad05c8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optical and Near-infrared observations of the distant but bright ''New Year's Burst'' GRB 220101A

Popis výsledku v původním jazyce

High-redshift gamma-ray bursts (GRBs) are useful to probe the early Universe, but only a few candidates have been detected so far. Here, we report the optical and near-infrared observations of the afterglow of a relatively high-redshift event GRB 220101A, which was triggered on New Year's Day of 2022, and therefore referred to as the ''New Year's burst''. With the optical spectra obtained by XL2.16/BFOSC and NOT/ALFOSC, we determine the redshift of the burst to be z = 4.615. We find that the optical afterglow of GRB 220101A is one of the most luminous ever detected. Based on our optical and near-infrared data, and combined with the X-ray observations, we perform a multiband fit with the Python package afterglowpy. The jet opening angle is constrained to similar to 3.degrees 4, which is consistent with the jet-break time at similar to 0.7 day. We also determine the circumburst density of n 0 = 0.15 cm-3 and kinetic energy E K,iso = 3.5 x 1054 erg. In the prompt phase of the burst, we find a ''mirror'' feature in the lightcurve from 80 s to 120 s. The physical origin of such a mirror feature is unclear.

Název v anglickém jazyce

Optical and Near-infrared observations of the distant but bright ''New Year's Burst'' GRB 220101A

Popis výsledku anglicky

High-redshift gamma-ray bursts (GRBs) are useful to probe the early Universe, but only a few candidates have been detected so far. Here, we report the optical and near-infrared observations of the afterglow of a relatively high-redshift event GRB 220101A, which was triggered on New Year's Day of 2022, and therefore referred to as the ''New Year's burst''. With the optical spectra obtained by XL2.16/BFOSC and NOT/ALFOSC, we determine the redshift of the burst to be z = 4.615. We find that the optical afterglow of GRB 220101A is one of the most luminous ever detected. Based on our optical and near-infrared data, and combined with the X-ray observations, we perform a multiband fit with the Python package afterglowpy. The jet opening angle is constrained to similar to 3.degrees 4, which is consistent with the jet-break time at similar to 0.7 day. We also determine the circumburst density of n 0 = 0.15 cm-3 and kinetic energy E K,iso = 3.5 x 1054 erg. In the prompt phase of the burst, we find a ''mirror'' feature in the lightcurve from 80 s to 120 s. The physical origin of such a mirror feature is unclear.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

959

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

118

Kód UT WoS článku

001126661200001

EID výsledku v databázi Scopus

2-s2.0-85181516569