Characterization of the GRB prompt fundamental plane using Fermi-GBM data

Pradyumna, S.; Desai, S.

doi:10.1016/j.jheap.2022.06.003

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…(See table 2 of ref. [16] and references therein for a comparison to other GRB correlations.) Hence, it would be premature to use the Amati relation as a stand-alone probe of precision Cosmology.…”

Section: Jcap10(2022)069mentioning

confidence: 99%

“…For more than two decades, GRBs have also been proposed as standard candles using bivariate as well fundamental plane based correlations between different GRB observables in both the prompt as well the afterglow phase [2,[11][12][13][14][15][16]. One of the most widely studied relations among these is the Amati relation, which posits a tight relation between the spectral peak energy in the GRB rest-frame (E p ) and the isotropic equivalent radiated energy (E iso ) [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Low redshift calibration of the Amati relation using galaxy clusters

Govindaraj

Desai

2022

J. Cosmol. Astropart. Phys.

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In this work, we use the angular diameter distances of 38 galaxy clusters with joint X-ray/SZE observation to circumvent the circularity problem in the Amati relation for Gamma-ray Bursts (GRBs). Assuming the validity of cosmic-distance duality relation, we obtain the luminosity distance from the cluster angular diameter distance and use that to calculate the isotropic equivalent energy of two different GRB datasets, after restricting the GRB redshift range to z < 0.9. We then use these GRB datasets to test the Amati relation at the low redshifts using the galaxy cluster distances. Our best-fit Amati relation parameters are consistent with a previous estimate for the same dataset. The intrinsic scatter which we obtain for the two datasets is about 45% and 15%, and is comparable with that found by other distance anchors used to study the Amati relation.

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Section: Jcap10(2022)069mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low redshift calibration of the Amati relation using galaxy clusters

Govindaraj

Desai

2022

J. Cosmol. Astropart. Phys.

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“…The wide field of view (∼10 • in diameter) will enable the simultaneous investigation of multiple sources during the same pointing, making it possible to perform deep observations of complex galactic regions such as the Cygnus region or the Galactic Center. Besides the core science program, a portion of the observation time will be dedicated to the study of selected galactic [6][7][8] and extragalactic targets [9]. Follow-up observations of selected transient and multi-messenger astrophysics phenomena, such as GRBs, GWs, and very high-energy neutrinos, are also planned [10].…”

Section: Introductionmentioning

confidence: 99%

The Data Processing System of the ASTRI Mini-Array Project

Lombardi¹,

Antonelli²,

Bigongiari³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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The ASTRI Mini-Array is an international project to build and operate an array of nine small-sized (4-m diameter) Imaging Atmospheric Cherenkov Telescopes (IACTs) at the Observatorio del Teide (Tenerife, Spain). The array is designed to perform deep galactic and extragalactic gamma-ray sky observations in the 1-200 TeV energy band. As part of the overall software system, the ASTRI team is developing a dedicated Data Processing System consisting of specific software components that implement all the functionalities needed to achieve the final science products from raw data. The main software components are the Cherenkov Camera Pre-Processing (for offline conversion from binary to FITS data format of Cherenkov camera raw data), the Stereo Event Builder (for offline stereo array trigger of Cherenkov events), the Cherenkov Data Pipeline (for data reduction and analysis), and the Calibration Software (for all required calibrations). An additional components for Stellar Intensity Interferometry data analysis is also envisaged. Thanks to the high-speed network connection available between Tenerife and Italy and the low data volume produced by the innovative ASTRI cameras, raw data files acquired onsite will be delivered to the ASTRI Data Center in Rome immediately after acquisition. At the Data Center, the Data Processing System will automatically perform the pre-processing, software stereo trigger, calibration, reduction, and analysis of the raw data up to the generation of science-ready data (event-lists and Instrument Response Function, to be delivered to the science community) as well as of automated science products. In this contribution we present the main features and components of the ASTRI Data Processing System and report on the status of its development and implementation.

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Calibration of Luminosity Correlations of Gamma-Ray Bursts Using Quasars

Purohit,

Desai

2024

Galaxies

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In order to test the efficacy of gamma-ray bursts (GRBs) as cosmological probes, we characterize the scatter in the correlations between six pairs of GRB observables. However, some of these observables depend on the luminosity distance, for which one needs to assume an underlying cosmological model. In order to circumvent this circularity problem, we use X-ray and UV fluxes of quasars as distance anchors to calculate the luminosity distance in a model-independent manner, which, in turn, is used to calculate the GRB-related quantities. We find that all six pairs of regression relations show high intrinsic scatter for both low- and high-redshift samples. This implies that these GRB observables cannot be used as model-independent high-precision cosmological probes.

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Characterization of the GRB prompt fundamental plane using Fermi-GBM data

Cited by 3 publications

References 36 publications

Low redshift calibration of the Amati relation using galaxy clusters

Low redshift calibration of the Amati relation using galaxy clusters

The Data Processing System of the ASTRI Mini-Array Project

Calibration of Luminosity Correlations of Gamma-Ray Bursts Using Quasars

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