GN-z11-flash was a signal from a man-made satellite not a gamma-ray burst at redshift 11. Michałowski, M. J., Kamiński, K., Kamińska, M. K., & Wnuk, E. arXiv e-prints, 2102:arXiv:2102.13164, February, 2021.
GN-z11-flash was a signal from a man-made satellite not a gamma-ray burst at redshift 11 [link]Paper  abstract   bibtex   
Long gamma-ray bursts (GRB), explosions of very massive stars, provide crucial information on stellar and galaxy evolution, even at redshifts z \textasciitilde 8 - 9.5, when the Universe was only 500-600 million years old. Recently, during observations of a galaxy at a redshift of z \textasciitilde 11 (400 million years after the Big Bang), a bright signal, named GN-z11-flash, shorter than 245 s was detected and interpreted as an ultraviolet flash associated with a GRB in this galaxy, or a shock-breakout in a Population III supernova. Its resulting luminosity would be consistent with that of other GRBs, but a discussion based on probability arguments started on whether this is instead a signal from a man-made satellite or a Solar System object. Here we show a conclusive association of GN-z11-flash with Breeze-M upper stage of a Russian Proton rocket on a highly elliptical orbit. This rules out GN-z11-flash as the most distant GRB ever detected. It also implies that monitoring of a larger sample of very high redshift galaxies is needed to detect such distant GRBs. This also highlights the importance of a complete database of Earth satellites and debris, which can allow proper interpretation of astronomical observations.
@article{michalowski_gn-z11-flash_2021,
	title = {{GN}-z11-flash was a signal from a man-made satellite not a gamma-ray burst at redshift 11},
	volume = {2102},
	url = {http://adsabs.harvard.edu/abs/2021arXiv210213164M},
	abstract = {Long gamma-ray bursts (GRB), explosions of very massive stars, provide 
crucial information on stellar and galaxy evolution, even at redshifts z
{\textasciitilde} 8 - 9.5, when the Universe was only 500-600 million years old.
Recently, during observations of a galaxy at a redshift of z {\textasciitilde} 11 (400
million years after the Big Bang), a bright signal, named GN-z11-flash,
shorter than 245 s was detected and interpreted as an ultraviolet flash
associated with a GRB in this galaxy, or a shock-breakout in a
Population III supernova. Its resulting luminosity would be consistent
with that of other GRBs, but a discussion based on probability arguments
started on whether this is instead a signal from a man-made satellite or
a Solar System object. Here we show a conclusive association of
GN-z11-flash with Breeze-M upper stage of a Russian Proton rocket on a
highly elliptical orbit. This rules out GN-z11-flash as the most distant
GRB ever detected. It also implies that monitoring of a larger sample of
very high redshift galaxies is needed to detect such distant GRBs. This
also highlights the importance of a complete database of Earth
satellites and debris, which can allow proper interpretation of
astronomical observations.},
	urldate = {2021-03-04},
	journal = {arXiv e-prints},
	author = {Michałowski, Michał J. and Kamiński, Krzysztof and Kamińska, Monika K. and Wnuk, Edwin},
	month = feb,
	year = {2021},
	keywords = {Astrophysics - High Energy Astrophysical Phenomena},
	pages = {arXiv:2102.13164},
}

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