Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations

Dzhappuev, D. D.; Afashokov, Yu. Z.; Dzaparova, I. M.; Dzhatdoev, T.; Горбачева, Е. А.; Karpikov, I.; Khadzhiev, M. M.; Klimenko, N. F.; Kudzhaev, A. U.; Kurenya, A. N.; Lidvansky, A. S.; Михайлова, О. И.; Petkov, V. B.; Podlesnyi, E. I.; A., Pozdnukhov, N.; Romanenko, V. S.; Рубцов, Г.; Troitsky, Sergey; Unatlokov, I. B.; Vaiman, I. A.; Yanin, A. F.; Zhuravleva, K. V.

doi:10.1134/s0021364022603244

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…In October 2022, GRB 221009A was detected at energies at 18 TeV by the LHAASO observatory [187] and upto 250 TeV by the Carpet-2 detector [188]. This burst was also seen by Fermi-LAT in the 0.1-1.0 GeV range.…”

Section: Searches Based On Tev-pev Observationsmentioning

confidence: 99%

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai¹

2023

Preprint

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Lorentz invariance is one of the fundamental tenets of Special Relativity, and has been extensively tested with laboratory and astrophysical observations. However, many quantum gravity models and theories beyond the Standard Model of Particle Physics predict a violation of Lorentz invariance at energies close to Planck scale. This article reviews observational and experimental tests of Lorentz invariance violation (LIV) with photons, neutrinos and gravitational waves. Most astrophysical tests of LIV using photons are based on searching for a correlation of the spectral lag data with redshift and energy. These have been primarily carried out using compact objects such as pulsars, Active Galactic Nuclei (AGN), and Gamma-ray bursts (GRB). There have also been some claims for LIV from some of these spectral lag observations with GRBs, which however are in conflict with the most stringent limits obtained from other LIV searches. Searches have also been carried out using polarization measurements from GRBs and AGNs. For neutrinos, tests have been made using both astrophysical observations at MeV energies (from SN 1987A) as well as in the TeV-PeV energy range based on IceCube observations, atmospheric neutrinos, and long-baseline neutrino oscillation experiments. Cosmological tests of LIV entail looking for a constancy of the speed of light as a function of redshift using multiple observational probes, as well as looking for birefringence in Cosmic Microwave background observations. This article will review all of these aforementioned observational tests of LIV, including results which are in conflict with each other.

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Section: Searches Based On Tev-pev Observationsmentioning

confidence: 99%

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai¹

2023

Preprint

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“…Most unusually, many facilities, including Fermi, AGILE, Konus-Wind, and INTEGRAL, reported detecting X-ray and gamma-ray emission from this GRB an hour prior to the Swift detection [92][93][94][95][96][97][98][99]. It is also the second GRB to be detected at TeV energies, and the first with photons of above 10 TeV [100], with one photon being reported at 251 TeV [101]. The isotropic energy from this event is still to be confirmed, but initial estimates suggest it is E iso ∼ 1-6 × 10 54 [95,97,102,103], close to that of GRB 160625B [102].…”

Section: Record-breaking Grbsmentioning

confidence: 99%

Swift/UVOT: 18 Years of Long GRB Discoveries and Advances

Oates

2023

Universe

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The Neil Gehrels Swift Observatory (Swift) has been in operation for 18 years. The Ultra-Violet/Optical Telescope (UVOT) onboard Swift was designed to capture the earliest optical/UV emission from gamma-ray bursts (GRBs), spanning the first few minutes to days after the prompt gamma-ray emission. In this article, we provide an overview of the long GRBs (whose prompt gamma-ray duration is >2 s) observed by the Swift/UVOT, and review the major discoveries that have been achieved by the Swift/UVOT over the last 18 years. We discuss where improvements have been made to our knowledge and understanding of the optical/UV emission, particularly the early optical/UV afterglow.

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“…Within the following discussion, these datapoints will be retained as reported, with those caveats. And with GRB221009A, for the first time, at least one higher-energy photon may be inferred by Carpet-2 via the cosmic-ray air-shower angle of arrival (AoA) at 251 TeV [22]. The reconstructed AoA was at R.A. = 289.51 • and Dec. = 18.44 • , detected 1338 s after triggering by Swift and 4536 s after the Fermi GBM.…”

Section: Introductionmentioning

confidence: 96%

Holographic Quantum-Foam Blurring Is Consistent with Observations of Gamma-Ray Burst GRB221009A

Steinbring

2023

Galaxies

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Gamma-ray burst GRB221009A was of unprecedented brightness in the γ-rays and X-rays through to the far ultraviolet, allowing for identification within a host galaxy at redshift z=0.151 by multiple space and ground-based optical/near-infrared telescopes and enabling a first association—via cosmic-ray air-shower events—with a photon of 251 TeV. That is in direct tension with a potentially observable phenomenon of quantum gravity (QG), where spacetime “foaminess” accumulates in wavefronts propagating cosmological distances, and at high-enough energy could render distant yet bright pointlike objects invisible, by effectively spreading their photons out over the whole sky. But this effect would not result in photon loss, so it remains distinct from any absorption by extragalactic background light. A simple multiwavelength average of foam-induced blurring is described, analogous to atmospheric seeing from the ground. When scaled within the fields of view for the Fermi and Swift instruments, it fits all z≤5 GRB angular-resolution data of 10 MeV or any lesser peak energy and can still be consistent with the highest-energy localization of GRB221009A: a limiting bound of about 1 degree is in agreement with a holographic QG-favored formulation.

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Upper Limits on the Isotropic Diffuse Flux of Cosmic PeV Photons from Carpet-2 Observations

Cited by 5 publications

References 26 publications

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Swift/UVOT: 18 Years of Long GRB Discoveries and Advances

Holographic Quantum-Foam Blurring Is Consistent with Observations of Gamma-Ray Burst GRB221009A

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