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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The search for Gamma Ray Burst (GRB) emission in the energy range 1-100 GeVin coincidence with the satellite detection has been carried out using theAstrophysical Radiation with Ground-based Observatory at YangBaJing (ARGO-YBJ)experiment. The high altitude location (4300 m a.s.l.), the large activesurface ($\sim$ 6700 m$^2$ of Resistive Plate Chambers), the wide field of view($\sim 2~$sr, limited only by the atmospheric absorption) and the high dutycycle ($>$ 86 %) make the ARGO-YBJ experiment particularly suitable to detectshort and unexpected events like GRBs. With the scaler mode technique, i.e.,counting all the particles hitting the detector with no measurement of theprimary energy and arrival direction, the minimum threshold of $\sim$ 1 GeV canbe reached, overlapping the direct measurements carried out by satellites.During the experiment lifetime, from December 17, 2004 to February 7, 2013, atotal of 206 GRBs occurring within the ARGO-YBJ field of view (zenith angle$\theta$ $\le$ 45$^{\circ}$) have been analyzed. This is the largest sample ofGRBs investigated with a ground-based detector. Two lightcurve models have beenassumed and since in both cases no significant excess has been found, thecorresponding fluence upper limits in the 1-100 GeV energy region have beenderived, with values as low as 10$^{-5}~$erg cm$^{-2}$. The analysis of asubset of 24 GRBs with known redshift has been used to constrain the fluenceextrapolation to the GeV region together with possible cutoffs under differentassumptions on the spectrum.

Search for GeV Gamma Ray Bursts with the ARGO-YBJ Detector: Summary of Eight Years of Observations