English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present a carefully selected sub-sample of Swift Long Gamma-ray Bursts(GRBs), that is complete in redshift. The sample is constructed by consideringonly bursts with favorable observing conditions for ground-based follow-upsearches, that are bright in the 15-150 keV Swift/BAT band, i.e. with 1-s peakphoton fluxes in excess to 2.6 ph s^-1 cm^-2. The sample is composed by 58bursts, 52 of them with redshift for a completeness level of 90%, while anothertwo have a redshift constraint, reaching a completeness level of 95%. For onlythree bursts we have no constraint on the redshift. The high level of redshiftcompleteness allows us for the first time to constrain the GRB luminosityfunction and its evolution with cosmic times in a unbiased way. We find thatstrong evolution in luminosity (d_l=2.3\pm 0.6) or in density (d_d=1.7\pm 0.5)is required in order to account for the observations. The derived redshiftdistribution in the two scenarios are consistent with each other, in spite oftheir different intrinsic redshift distribution. This calls for otherindicators to distinguish among different evolution models. Complete samplesare at the base of any population studies. In future works we will use thisunique sample of Swift bright GRBs to study the properties of the population oflong GRBs.

A complete sample of bright Swift Long Gamma-Ray Bursts: Sample presentation, Luminosity Function and evolution