A complete sample of bright Swift long gamma-ray bursts: testing the spectral-energy correlations
Corresponding Author
L. Nava
SISSA – via Bonomea 265, I-34136 Trieste, Italy
E-mail: [email protected]Search for more papers by this authorR. Salvaterra
INAF – IASF Milano, via E. Bassini 15, I-20133 Milano, Italy
Search for more papers by this authorG. Ghirlanda
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Ghisellini
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. Campana
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. Covino
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Cusumano
INAF – IASF Palermo, via Ugo La Malfa 153, I-90146 Palermo, Italy
Search for more papers by this authorP. D’Avanzo
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorV. D’Elia
ASI – Science Data Centre, via Galileo Galilei, I-00044 Frascati, Italy
INAF – Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monte Porzio Catone, Italy
Search for more papers by this authorD. Fugazza
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorA. Melandri
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorB. Sbarufatti
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. D. Vergani
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Tagliaferri
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorCorresponding Author
L. Nava
SISSA – via Bonomea 265, I-34136 Trieste, Italy
E-mail: [email protected]Search for more papers by this authorR. Salvaterra
INAF – IASF Milano, via E. Bassini 15, I-20133 Milano, Italy
Search for more papers by this authorG. Ghirlanda
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Ghisellini
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. Campana
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. Covino
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Cusumano
INAF – IASF Palermo, via Ugo La Malfa 153, I-90146 Palermo, Italy
Search for more papers by this authorP. D’Avanzo
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorV. D’Elia
ASI – Science Data Centre, via Galileo Galilei, I-00044 Frascati, Italy
INAF – Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monte Porzio Catone, Italy
Search for more papers by this authorD. Fugazza
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorA. Melandri
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorB. Sbarufatti
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorS. D. Vergani
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorG. Tagliaferri
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
Search for more papers by this authorABSTRACT
We use a nearly complete sample of gamma-ray bursts (GRBs) detected by the Swift satellite to study the correlations between the spectral peak energy Epeak of the prompt emission, the isotropic energetics Eiso and the isotropic luminosity Liso. This GRB sample is characterized by a high level of completeness in redshift (90 per cent). This allows us to probe in an unbiased way the issue related to the physical origin of these correlations against selection effects. We find that one burst, GRB 061021, is an outlier to the Epeak–Eiso correlation. Despite this case, we find strong Epeak–Eiso and Epeak–Liso correlations for the bursts of the complete sample. Their slopes, normalizations and dispersions are consistent with those found with the whole sample of bursts with measured redshift and Epeak. This means that the biases present in the total sample commonly used to study these correlations do not affect their properties. Finally, we also find no evolution with redshift of the Epeak–Eiso and Epeak–Liso correlations.
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