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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Optical and Near-infrared observations of the distant but bright ''New Year's Burst'' GRB 220101A
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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