The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a "full coverage" (central carpet with an active area of â¼93%) air shower array dedicated to gamma-ray astronomy and cosmic-ray studies. The wide field of view (â¼2 sr) and high duty cycle (>86%), made ARGO-YBJ suitable to search for short and unexpected gamma-ray emissions like gamma-ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view (zenith angle Î¸ â¤ 45Â°). A search for possible emission associated with these GRBs has been made in the two energy ranges 10-100 GeV and 10-1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a set of different time windows inside the interval of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at a 99% confidence level have been evaluated, with values ranging from â¼10-5erg cm-2to â¼10-1erg cm-2. The Fermi-GBM burst GRB 090902B, with a high-energy photon of 33.4 GeV detected by Fermi-LAT, is discussed in detail.
Bartoli, B., Bernardini, P., Bi, X.J., Cao, Z., Catalanotti, S., Chen, S.Z., et al. (2017). Search for Gamma-Ray Bursts with the ARGO-YBJ Detector in Shower Mode. THE ASTROPHYSICAL JOURNAL, 842(1), 31 [10.3847/1538-4357/aa74bc].